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Weldability, microstructure and mechanical properties of laser-welded selective laser melted 304 stainless steel joints 被引量:15
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作者 Jingjing Yang Yun Wang +4 位作者 Fangzhi Li Wenpu Huang Guanyi Jing Zemin Wang Xiaoyan Zeng 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第9期1817-1824,共8页
Laser welding is a promising process for joining small components produced by selective laser melting (SLM) to fabricate the large-scale and complex-shaped parts. In the work, the morphology, microstructure, microhard... Laser welding is a promising process for joining small components produced by selective laser melting (SLM) to fabricate the large-scale and complex-shaped parts. In the work, the morphology, microstructure, microhardness, tensile properties and corrosion resistance of the laser welded stress-relieved SLMed 304 stainless steel joints are investigated, as the different sections of stress-relieved SLMed 304 stainless steel are joined. Results show that the SLMed 304 stainless steel plates have a good laser weldability. The microstructure of laser-welded joints consists of the cellular dendrites in austenite matrix within columnar grains, exhibiting a coarser dendrite structure, lower microhardness (~220HV) and tensile properties (tensile strength of ~750 MPa, and area reduction of ~27.6%), but superior corrosion resistance to those of SLMed plates. The dendrite arm spacing of the joints varies from ~3.7μm in center zone, to ~5.0 (xm in fusion zone, to ~2.5 in epitaxial zone. The SLMed anisotropy shows a negligible effect on the microstructure and performance of the laser-welded joints. The laser welding along the building directions of the SLMed base plates can induce a slightly finer dendritic structure and higher tensile properties. 展开更多
关键词 SELECTIVE LASER MELTING LASER welding 304 STAINLESS steel Anisotropy
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Characterization of stress corrosion crack growth of 304 stainless steel by electrochemical noise and scanning Kelvin probe 被引量:14
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作者 赵茹 张正 +2 位作者 石江波 陶蕾 宋诗哲 《Journal of Central South University》 SCIE EI CAS 2010年第1期13-18,共6页
The fatigue pre-cracking 304 stainless steel (SS) specimens with lengths of 1.002 mm (L-crack) and 0.575 mm (S-crack) were prepared. Their corrosion behavior was studied by electrochemical noise (EN) in 4 mol/... The fatigue pre-cracking 304 stainless steel (SS) specimens with lengths of 1.002 mm (L-crack) and 0.575 mm (S-crack) were prepared. Their corrosion behavior was studied by electrochemical noise (EN) in 4 mol/L NaC1 + 0.01 mol/L Na2S203 solution under slow-strain-rate-testing (SSRT) conditions. Moreover, the characteristics of L-crack's surface morphology and potential distribution with scanning Kelvin probe (SKP) before and after SSRT were also discussed. Compared with S-crack, L-crack is propagated and the features of crack propagation can be obtained. After propagation, the noise amplitudes increase with increasing stress and accelerating corrosion, the white noises at low and high frequencies (WE and WH) of the later stage are one order of magnitude larger than that at early stage in the current power spectral densities (PSDs). The potential PSDs also increase, but WH disappears. In addition, the crack propagation can be demonstrated according to variation of probability distribution, surface morphology and potential distribution. 展开更多
关键词 304 stainless steel fatigue pre-cracking electrochemical noise stress corrosion cracking (SCC) scanning Kelvin probe
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高能紫外光治疗白癜风的临床观察 被引量:12
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作者 丁晓岚 徐前喜 +4 位作者 孙青苗 钱佳丽 王晓艳 黄海燕 杜娟 《临床皮肤科杂志》 CAS CSCD 北大核心 2010年第11期729-731,共3页
目的:评价304 nm高能紫外光靶向治疗白癜风的疗效及安全性。方法:采用美国DuaLight^(TM)UV120-2型高能紫外光治疗仪治疗白癜风患者87例。治疗前判定皮肤类型,测定最小红斑量。照射起始剂量为最小红斑量的2倍,逐渐增加照射剂量,每周照射2... 目的:评价304 nm高能紫外光靶向治疗白癜风的疗效及安全性。方法:采用美国DuaLight^(TM)UV120-2型高能紫外光治疗仪治疗白癜风患者87例。治疗前判定皮肤类型,测定最小红斑量。照射起始剂量为最小红斑量的2倍,逐渐增加照射剂量,每周照射2次,规律治疗3个月后判定疗效。结果:87例患者中,痊愈14例,显效15例,好转53例,无效5例。有效率33.3%。进展期疗效好于稳定期,各部位之间疗效差异无统计学意义。不良反应为红斑、轻度瘙痒等,均可自行消退。结论:304 nm高能紫外光治疗白癜风起效快,疗效肯定,能最大限度保护白斑周围正常皮肤。局部不良反应少,是一种简单、安全的治疗方法。 展开更多
关键词 紫外光 高能 304 NM 白癜风
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Effect of Strain and Chloride Concentration on Pitting Susceptibility for Type 304 Austenitic Stainless Steel 被引量:11
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作者 吕国诚 程海东 +1 位作者 许淳淳 何宗虎 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第2期314-319,共6页
The effects of strain and chloride concentration on pitting susceptibility for type 304 stainless steel were studied in situ using the electrochemical technology under constant strain. The impact factor fc was brought... The effects of strain and chloride concentration on pitting susceptibility for type 304 stainless steel were studied in situ using the electrochemical technology under constant strain. The impact factor fc was brought forward to value the effect of strain on pitting. The pitting behaviors of type 304 stainless steel in various chloride concentrations under the strain levels 0%, 10%, and 30% were investigated. Potentiostatic polarization technology was used to study how the chloride concentration affected corrosion current density. The results indicated that fc increased substantially and pitting potential varied remarkably when chloride concentration was over 90 mg.L . Under the three levels of strain mentioned above, when chloride concentration was below 463 mg.L^-1,121 mg.L^-1, and 98 mg.L^-1 respectively, the pitting potential shifted towards positivity and, the passive film became more stable. When the strain was below 10%, the pitting susceptibility of type 304 stainless steel varied greatly as strain increased, whereas the susceptibility only changed a little when the strain was over 10%. 展开更多
关键词 304 stainless steel STRAIN pitting corrosion chloride concentration
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Effects of Laser Shock Processing on Mechanical Properties of Laser Welded ANSI 304 Stainless Steel Joint 被引量:11
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作者 ZHANG Yongkang ZHANG Lei +4 位作者 LUO Kaiyu SUN Guifang LU Jinzhong DAI Fengze ZHONG Junwei 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2012年第2期285-292,共8页
With the rapid development of engineering component with integration,high-speed and multi-parameter,traditional techniques haven't met practical needs in extreme service environment.Laser welding,a new welding techno... With the rapid development of engineering component with integration,high-speed and multi-parameter,traditional techniques haven't met practical needs in extreme service environment.Laser welding,a new welding technology,has been widely used.However,it would generate the drop of mechanical properties for laser welded joint due to its thermal effect.Laser shock processing(LSP) is one of the most effective methods to improve the mechanical properties of laser welded ANSI 304 stainless steel joint.In this paper,the effects of LSP on the mechanical properties of laser welded ANSI 304 stainless steel joint have been investigated.The welded joint on the front of the tensile samples is treated by LSP impacts,and the overlapping rate of the laser spot is 50%.The tensile test of the laser welded joint with and without LSP impacts is carried out,and the fracture morphology of the tensile samples is analyzed by scanning electron microscope(SEM).Compared with the yield strength of 11.70 kN,the tensile strength of 37.66 kN,the yield-to-tensile strength ratio of 0.310 7,the elongation of 25.20%,the area reduction of 32.68% and the elastic modulus of 13 063.876 MPa,the corresponding values after LSP impacts are 14.25 kN,38.74 kN,0.367 8,26.58%,42.29% and 14 754.394 MPa,respectively.Through LSP impacts,the increasing ratio of the yield strength and tensile strength are 121.79% and 102.87%,respectively;the elongation and area reduction are improved by 5.48% and 29.38%,respectively.By comparing with coarse fracture surface of the welded joint,the delamination splitting with some cracks in the sharp corner of the welded joint and asymmetric dimples,LSP can cause brighter fracture surface,and finer and more uniform dimples.Finally,the schematic illustration of dimple formation with LSP is clearly described.The proposed research ensures that the LSP technology can clearly improve the yield strength,tensile strength,yield-to-tensile strength ratio,elongation,area reduction and elastic modulus of the welded joint.The enhancem 展开更多
关键词 Laser shock processing(LSP) laser welding ANSI 304 stainless steel mechanical property facture morphology
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Electrochemical corrosion resistance of CeO_2-Cr/Ti coatings on 304 stainless steel via pack cementation 被引量:11
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作者 邢学刚 韩志军 +1 位作者 王鹤峰 卢盼娜 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第10期1122-1128,共7页
The pack cementation was employed to improve the electrochemical corrosion resistance of 304 stainless steel via CeO2- Cr modified Ti coatings. Continuous coatings were formed on 304 stainless steel surface by this me... The pack cementation was employed to improve the electrochemical corrosion resistance of 304 stainless steel via CeO2- Cr modified Ti coatings. Continuous coatings were formed on 304 stainless steel surface by this method. A series of electrochemical experiments were carried out to investigate the corrosion resistance of 304 stainless steel, Ti coating and CeO2-Cr/Ti coatings. The sample surface was investigated by scanning electron microscopy (SEM). The phases of sample surface were detected by X-ray diffraction (XRD). It was concluded from all the outcomes that the Corrosion resistance of the samples could be sorted in the following sequence: CeO2-Cr/Ti coatings〉Ti coating〉304 stainless steel. 展开更多
关键词 electrochemical corrosion resistance rare earths Ti coating 304 stainless steel pack cementation
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Temperature and stress fields in electron beam welded Ti-15-3 alloy to 304 stainless steel joint with copper interlayer sheet 被引量:10
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作者 张秉刚 王廷 +2 位作者 段潇辉 陈国庆 冯吉才 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期398-403,共6页
Electron beam welding of Ti-15-3 alloy to 304 stainless steel (STS) using a copper filler metal was carried out. The temperature fields and stress distributions in the Ti/Fe and Ti/Cu/Fe joint during the welding pro... Electron beam welding of Ti-15-3 alloy to 304 stainless steel (STS) using a copper filler metal was carried out. The temperature fields and stress distributions in the Ti/Fe and Ti/Cu/Fe joint during the welding process were numerically simulated and experimentally measured. The results show that the rotated parabola body heat source is fit for the simulation of the electron beam welding. The temperature distribution is asymmetric along the weld center and the temperature in the titanium alloy plate is higher than that in the 304 STS plate. The thermal stress also appears to be in asymmetric distribution. The residual tensile stress mainly exists in the weld at the 304 STS side. The copper filler metal decreases the peak temperature and temperature grade in the joint as well as the residual stress. The longitudinal and lateral residual tensile strengths reduce by 66 MPa and 31 MPa, respectively. From the temperature and residual stress, it is concluded that copper is a good filler metal candidate for the electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel. 展开更多
关键词 Ti-15-3 alloy 304 stainless steel electron beam welding temperature field residual stress
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The Enrichment of Chloride Anion in the Occluded Cell and Its Effect on Stress Corrosion Crack of 304 Stainless Steel in Low Chloride Concentration Solution 被引量:11
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作者 吕国诚 许淳淳 +2 位作者 吕忆民 程海东 何宗虎 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第4期646-649,共4页
The enrichment of chloride anion within the occluded cell (OC) for Type 304 austenitic stainless steel in low chloride concentration solution has been investigated by means of a simulated OC. The influence of the en... The enrichment of chloride anion within the occluded cell (OC) for Type 304 austenitic stainless steel in low chloride concentration solution has been investigated by means of a simulated OC. The influence of the enrichment of chloride anion on stress corrosion crack (SCC) of Type 304 stainless steel has been studied. It was observed that the amount of chloride anion migration was proportional to the charge flowing through the anode. Owning to the effects of enrichment of chloride anion, low chloride concentration solution could induce SCC for Type 304 stainless steel. 展开更多
关键词 304 austenitic stainless steel occluded cells enrichment of chloride anion stress corrosion crack
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Development of processing windows for diffusion bonding of Ti-6Al-4V titanium alloy and 304 stainless steel with silver as intermediate layer 被引量:9
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作者 M.BALASUBRAMANIAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第9期2932-2938,共7页
As titanium alloy is chemically reactive,it is very difficult to join by conventional welding techniques.Titanium alloys can easily pick up nitrogen and oxygen from the atmosphere.In the fusion welding method,brittle ... As titanium alloy is chemically reactive,it is very difficult to join by conventional welding techniques.Titanium alloys can easily pick up nitrogen and oxygen from the atmosphere.In the fusion welding method,brittle intermetallic compounds are formed when joining titanium alloy and stainless steel,which decrease the mechanical behavior of the couples.Hence,for joining of titanium alloy,diffusion bonding is recommended.This work dealt with the measurement of feasible process parameters for diffusion bonding of Ti-6Al-4V and AISI 304 stainless steel with silver as an intermediate layer.The quality of the bonds was confirmed by the lap shear test and microstructural analysis.With the experimental results obtained,diffusion bonding windows were constructed and this will act as reference maps to identify the process parameters for obtaining defect free bond.Bonding was successful in the temperature range of 750-800 °C.Maximum lap shear strength was achieved under a bonding pressure of 5 MPa and holding time of 90 min. 展开更多
关键词 Ti-6Al-4V alloy SILVER AISI 304 stainless steel INTERLAYER diffusion bonding
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Electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel with copper interlayer sheet 被引量:9
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作者 王廷 张秉刚 +2 位作者 陈国庆 冯吉才 唐奇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第10期1829-1834,共6页
Electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel with a copper sheet as interlayer was carried out.Microstructures of the joint were studied by optical microscopy(OM),scanning electron microscopy... Electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel with a copper sheet as interlayer was carried out.Microstructures of the joint were studied by optical microscopy(OM),scanning electron microscopy(SEM) and X-ray diffractometry(XRD).In addition,the mechanical properties of the joint were evaluated by tensile test and the microhardness was measured.These two alloys were successfully welded by adding copper transition layer into the weld.Solid solution with a certain thickness was located at the interfaces between weld and base metal in both sides.Regions inside the weld and near the stainless steel were characterized by solid solution of copper with TiFe2 intermetallics dispersedly distributed in it.While weld near titanium alloy contained Ti-Cu and Ti-Fe-Cu intermetallics layer,in which the hardness of weld came to the highest value.Brittle fracture occurred in the intermetallics layer when the joint was stretched. 展开更多
关键词 Ti-15-3 titanium alloy 304 stainless steel electron beam welding interrnetallics layer mechanical properties
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Antibacterial Property of Cu Modified Stainless Steel by Plasma Surface Alloying 被引量:8
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作者 ZHANG Xiang-yu HUANG Xiao-bo JIANG Li MA Yong FAN Ai-lan TANG Bin 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2012年第4期75-79,共5页
Stainless steel(SS) is not recommended to be used in hospital environments for work surfaces and door furniture due to the lack of antibacterial properties.To this end,a novel SS surface modified layer with both a q... Stainless steel(SS) is not recommended to be used in hospital environments for work surfaces and door furniture due to the lack of antibacterial properties.To this end,a novel SS surface modified layer with both a quick bacterial killing rate and relatively thick has been obtained by plasma surface alloying with Cu.The microstructure,elements distribution and phase identification were analyzed by SEM,GDS,XRD and XPS.A spread plate method was adopted for evaluation of antibacterial property of specimens against Escherichia coli(E.coli) and Staphylococcus aureus(S.aureus).The experimental results demonstrate that the surface modified layer with the thickness of about 26 μm is uniform and dense.The layer is mainly composed of a mixture of pure Cu,expanded austenite phase and a few Fe3O4 phase.The Cu modified layer exhibits excellent antibacterial effects against E.coli and S.aureus within 1 h.No viable E.coli and S.aureus was found after 3 h(100% killed).The modified layer is relatively thick,hence it is expected that the Cu modified SS will have a durable antibacterial function 展开更多
关键词 plasma alloying CU ANTIMICROBIAL AISI 304 stainless steel
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Electron beam welding of 304 stainless steel to QCr0.8 copper alloy with copper filler wire 被引量:6
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作者 张秉刚 赵健 +1 位作者 李晓鹏 冯吉才 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第12期4059-4066,共8页
Electron beam welding (EBW) of 304 stainless steel to QCr0.8 copper alloy with copper filler wire was carried out. Orthogonal experiment was performed to investigate the effects of process parameters on the tensile ... Electron beam welding (EBW) of 304 stainless steel to QCr0.8 copper alloy with copper filler wire was carried out. Orthogonal experiment was performed to investigate the effects of process parameters on the tensile strength of the joints, and the process parameters were optimized. The optimum process parameters are as follows:beam current of 30 mA, welding speed of 100 mm/min, wire feed rate of 1 m/min and beam offset of-0.3 mm. The microstructures of the optimum joint were studied. The results indicate that the weld is mainly composed of dendriticαphase with little globularεphase, and copper inhomogeneity only occurs at the top of the fusion zone. In addition, a melted region without mixing exists near the weld junction of copper side. This region with a coarser grain size is the weakest section of the joints. It is found that the microhardness of the weld decreases with the increase of the copper content in solid solution. The highest tensile strength of the joint is 276 MPa. 展开更多
关键词 304 stainless steel QCr0.8 copper alloy electron beam welding dissimilar joint mechanical properties
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Gas tungsten arc welding of CP-copper to 304 stainless steel using different filler materials 被引量:5
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作者 Sajjad Gholami SHIRI Mohsen NAZARZADEH +1 位作者 Mahmood SHARIFITABAR Mehdi Shafiee AFARANI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期2937-2942,共6页
The dissimilar joining of CP-copper to 304 stainless steel was performed by gas tungsten arc welding process using different filler materials. The results indicated the formation of defect free joint by using copper f... The dissimilar joining of CP-copper to 304 stainless steel was performed by gas tungsten arc welding process using different filler materials. The results indicated the formation of defect free joint by using copper filler material. But, the presence of some defects like solidification crack and lack of fusion caused decreasing tensile strength of other joints. In the optimum conditions, the tensile strength of the joint was 96% of the weaker material. Also, this joint was bent till to 180° without any macroscopic defects like separation, tearing or fracture. It was concluded that copper is a new and good candidate for gas tungsten arc welding of copper to 304 stainless steel. 展开更多
关键词 gas tungsten arc welding CP-copper 304 stainless steel dissimilar joint MICROSTRUCTURE mechanical properties
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304奥氏体不锈钢低气压离子渗氮组织与性能研究 被引量:5
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作者 袁淑敏 朱秋华 胡静 《热加工工艺》 CSCD 北大核心 2015年第18期183-185,共3页
在400℃、低气压下对304奥氏体不锈钢进行低温低压离子渗氮处理。采用扫描电镜、显微硬度计及万能摩擦试验机对表面改性后的304奥氏体不锈钢渗层组织、硬度及耐磨性进行了测试和分析。结果表明:304奥氏体不锈钢低温低气压渗氮形成了明... 在400℃、低气压下对304奥氏体不锈钢进行低温低压离子渗氮处理。采用扫描电镜、显微硬度计及万能摩擦试验机对表面改性后的304奥氏体不锈钢渗层组织、硬度及耐磨性进行了测试和分析。结果表明:304奥氏体不锈钢低温低气压渗氮形成了明显的白亮层;低气压对304奥氏体不锈钢离子渗氮具有良好的催渗效果,即渗层厚度随气压的减小而增加,在100 Pa条件下,渗层厚度达到最大值51.7μm;渗氮后试样表面硬度达到最大值1100 HV0.01;低温低气压离子渗氮能够提高304奥氏体不锈钢耐磨性,80 Pa和100 Pa是提高304奥氏体不锈钢耐磨性的最佳气压。 展开更多
关键词 304 奥氏体不锈钢 离子渗氮 耐磨性 硬度
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Bi_(2)S_(3)/CdS/TiO_(2)纳米复合材料的制备及对304不锈钢的光生阴极保护性能研究 被引量:1
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作者 叶梦颖 于佳汇 +1 位作者 王彤彤 高荣杰 《中国腐蚀与防护学报》 CAS CSCD 北大核心 2024年第2期372-380,共9页
通过超声辅助连续离子层吸附和反应法在TiO_(2)纳米管上负载CdS和Bi_(2)S_(3),通过SEM、XRD、XPS等手段对材料的形貌、结构、元素组成和价态进行表征,在模拟太阳光下,系统研究TiO_(2)纳米复合材料的电化学性能。结果表明,负载CdS和Bi_(2... 通过超声辅助连续离子层吸附和反应法在TiO_(2)纳米管上负载CdS和Bi_(2)S_(3),通过SEM、XRD、XPS等手段对材料的形貌、结构、元素组成和价态进行表征,在模拟太阳光下,系统研究TiO_(2)纳米复合材料的电化学性能。结果表明,负载CdS和Bi_(2)S_(3)的TiO_(2)纳米复合材料的光吸收范围扩展到可见光区,载流子的复合率也大大降低,光电流密度提升至850μA·cm-2,是改性前的3.4倍;将其与304不锈钢耦合后,电位降至-0.99 V,比改性前的耦合电位低约70 mV,可以进一步提升对304不锈钢的光生阴极保护效果。 展开更多
关键词 光生阴极保护 改性 Bi_(2)S_(3)/CdS/TiO_(2) 304 不锈钢
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用碱性抛光液化学机械抛光304不锈钢片研究 被引量:5
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作者 陈佳鹏 陈绍坤 +2 位作者 李庆 秦洪权 苏建修 《金刚石与磨料磨具工程》 CAS 2016年第2期6-9,23,共5页
为提高化学机械抛光的加工效果,我们研究了pH值、氧化剂种类和氧化剂含量对材料去除率和表面粗糙度的影响。结果表明:不同氧化剂的抛光液在各自的最佳pH值时达到最大的材料去除率,分别为181nm/min(H_2O_2抛光液,pH=9),177nm/min(Cr_2O_... 为提高化学机械抛光的加工效果,我们研究了pH值、氧化剂种类和氧化剂含量对材料去除率和表面粗糙度的影响。结果表明:不同氧化剂的抛光液在各自的最佳pH值时达到最大的材料去除率,分别为181nm/min(H_2O_2抛光液,pH=9),177nm/min(Cr_2O_3抛光液,pH=11),172nm/min(Na2Cr_2O_7抛光液,pH=11)和147nm/min(NaClO抛光液,pH=13);抛光液中氧化剂含量、pH值对抛光后不锈钢的表面粗糙度影响较小。其中,材料去除率较高的H_2O_2和Cr_2O_3可作为304不锈钢化学机械抛光碱性抛光液的氧化剂。 展开更多
关键词 304 不锈钢 碱性抛光液 PH 氧化剂 化学机械抛光 材料去除率
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Optimization of gas tungsten arc welding parameters for the dissimilar welding between AISI 304 and AISI 201 stainless steels 被引量:5
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作者 Wichan Chuaiphan Loeshpahn Srijaroenpramong 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2019年第2期170-178,共9页
This present study applied gas tungsten arc welding in order to join AISI 304 and AISI 201 stainless steels.The objective was to find the optimum welding condition that gave a weld bead in accordance with DIN EN ISO 2... This present study applied gas tungsten arc welding in order to join AISI 304 and AISI 201 stainless steels.The objective was to find the optimum welding condition that gave a weld bead in accordance with DIN EN ISO 25817 quality level B, pitting corrosion potential of the weld metal of not less than that of the AISI304 base metal and a ratio of delta-ferrite in austenite matrix of the weld metal of not lower than 3%.Such a ratio is a criterion widely accepted to protect the weld metal from solidification cracking. At the welding current of 75 A and by using pure argon as a shielding gas 0 to 8 vol.% and applying a welding speed in the range of 2-3.5 mm·s^(-1) was found to give a complete weld bead with an increased depthper-width ratio(promote weldability). For welding speed in the range of 3 and 3.5 mm·s^(-1)(promote corrosion resistance). Increasing the welding speed in such a range decreased the amount of delta-ferrite in the austenite matrix, and increased the pitting corrosion potential of the weld metal to be 302 mV_(SCE).This value was still lower than the pitting corrosion potential of the AISI 304 base metal. Mixing nitrogen in argon shielding gas increased the nitrogen content in the weld. The optimum condition was found when using a welding speed of 3 mm· s^(-1) and mixing 1 vol.% of nitrogen in the argon shielding gas(promote weldability and corrosion resistance). Pitted areas after potentiodynamic test were observed in the austenite in which its Cr content was relatively low. 展开更多
关键词 Dissimilar WELDMENT AISI 304 STAINLESS STEEL AISI 201 STAINLESS STEEL Gas tungsten arc welding(GTAW) Nitrogen Corrosion BEHAVIOR Mechanical BEHAVIOR
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Static and dynamic finite element analysis of 304 stainless steel rod and wire hot continuous rolling process 被引量:5
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作者 Siyu Yuan Liwen Zhang +4 位作者 Shulun Liao Mao Li Min Qi Yu Zhen Shuqi Guo 《Journal of University of Science and Technology Beijing》 CSCD 2008年第3期324-329,共6页
Three-dimensional finite element models were developed to analyze 304 stainless steel rod and wire hot continuous rolling process with the help of MSC.Marc software. The entire 30-pass deformation process and the actu... Three-dimensional finite element models were developed to analyze 304 stainless steel rod and wire hot continuous rolling process with the help of MSC.Marc software. The entire 30-pass deformation process and the actual parameters of production line were taken into account. Static and dynamic procedures were used to study the continuous rolling process with the aid of the thermo-mechanical coupled FEM of elastic-plasticity. The properties of billets, such as deformation, temperature field and rolling force, were mainly discussed. The simulation results of temperature agree well with the measured values. Comparisons of the analysis results obtained using static implicit method and dynamic implicit method were presented. It is shown that static implicit procedure is more accurate than dynamic implicit procedure and is able to simulate the rolling process with a lower speed, such as a roughing mill. Whereas, dynamic analysis shows a higher efficiency than static analysis and is fit for simulating the rolling process with a higher speed, such as a finishing mill. 展开更多
关键词 304 stainless steel static implicit dynamic implicit three-dimensional simulation continuous rolling
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泡沫铝夹芯梁抗爆性能的数值模拟分析 被引量:6
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作者 康建功 石少卿 +1 位作者 刘颖芳 汪敏 《爆破》 CSCD 北大核心 2009年第3期10-13,共4页
运用有限元软件LS-DYNA分析重量相同的2种材料梁在爆炸荷载作用下的动力响应,其中一种由304#不锈钢面板与泡沫铝芯材复合而成的夹芯梁,另一种由304#不锈钢单一材料制成的实体梁。对比了相同重量2种梁在跨中位移的变化情况,并将泡沫铝夹... 运用有限元软件LS-DYNA分析重量相同的2种材料梁在爆炸荷载作用下的动力响应,其中一种由304#不锈钢面板与泡沫铝芯材复合而成的夹芯梁,另一种由304#不锈钢单一材料制成的实体梁。对比了相同重量2种梁在跨中位移的变化情况,并将泡沫铝夹芯梁的计算结果与文献实验数据作了对比分析。结果显示,在冲量分别为1.83 kNs/m2、3.77 kNs/m2、6.08 kNs/m2及7.0 kNs/m2动荷载作用下,304#不锈钢实体梁的跨中位移分别是304#不锈钢面板泡沫铝夹芯梁跨中位移的1.1倍、1.35倍、1.26倍及1.14倍。由此可知,相同重量304#不锈钢面板泡沫铝夹芯梁较304#不锈钢实体梁具有更好抵抗爆炸荷载作用的能力。 展开更多
关键词 抗爆性能 泡沫铝夹芯梁 304#不锈钢 抗爆炸荷载
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Activated flux tungsten inert gas welding of 8 mm-thick AISI 304 austenitic stainless steel 被引量:6
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作者 刘观辉 刘美华 +3 位作者 易耀勇 张宇鹏 罗子艺 许磊 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第3期800-805,共6页
AISI 304 stainless steel plates were welded with activated flux tungsten inert gas(A-TIG) method by utilizing self-developed activated flux. It is indicated from the experimental results that for 8 mm-thick AISI 304 s... AISI 304 stainless steel plates were welded with activated flux tungsten inert gas(A-TIG) method by utilizing self-developed activated flux. It is indicated from the experimental results that for 8 mm-thick AISI 304 stainless steel plate, weld joint of full penetration and one-side welding with good weld appearance can be obtained in a single pass without groove preparation by utilizing A-TIG welding. Moreover, activated flux powders do not cause significant effect on the microstructure of TIG weld and the mechanical properties of A-TIG weld joints are also superior to those of C-TIG(conventional TIG) welding. 展开更多
关键词 A-TIG welding activated flux 304 stainless steel full penetration mechanical properties
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