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超快冷工艺生产X90管线钢组织性能与析出行为 被引量:9
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作者 张鹤松 朱国明 康永林 《材料热处理学报》 EI CAS CSCD 北大核心 2015年第12期103-109,共7页
利用超快冷工艺在2250热连轧生产线生产X90管线钢,通过光学显微镜和扫描电镜观察组织,利用透射电镜观察微观结构和析出形貌,通过物理化学相分析及理论计算对析出规律进行研究,并对应变时效性能进行了研究。结果表明,X90管线钢屈服强度61... 利用超快冷工艺在2250热连轧生产线生产X90管线钢,通过光学显微镜和扫描电镜观察组织,利用透射电镜观察微观结构和析出形貌,通过物理化学相分析及理论计算对析出规律进行研究,并对应变时效性能进行了研究。结果表明,X90管线钢屈服强度615-645 MPa,抗拉强度808-844 MPa,屈强比低于0.8,-20℃冲击功均在300 J以上;基体为由准多边形铁素体、粒状贝氏体、贝氏体铁素体及马氏体奥氏体组元构成的复相组织;析出为Ti、Nb的碳氮化物,超快冷工艺使管线钢中析出过程有效避开了析出鼻尖温度,从而使析出粒子更加细小弥散,析出沉淀强化作用理论计算值为92 MPa;经应变时效后拉伸曲线由Round-House形转变为Luders伸长型,出现明显的屈服平台,屈服强度增加250-280 MPa。 展开更多
关键词 超快冷 X90 组织性能 强化机制 应变时效
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大变形X80管线钢的应变时效 被引量:7
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作者 张骁勇 毕宗岳 +2 位作者 高惠临 牛辉 徐学利 《钢铁研究学报》 CAS CSCD 北大核心 2014年第2期28-33,共6页
大变形管线钢是一种管道在通过地质复杂地区(滑坡、地震、冻土等)时,为了降低地层移动对管道可能造成的变形损伤而开发出来的新型管道结构用材料。采用材料显微分析方法和力学性能测试等手段,对一种大变形X80管线钢在应变时效中的脆化... 大变形管线钢是一种管道在通过地质复杂地区(滑坡、地震、冻土等)时,为了降低地层移动对管道可能造成的变形损伤而开发出来的新型管道结构用材料。采用材料显微分析方法和力学性能测试等手段,对一种大变形X80管线钢在应变时效中的脆化规律进行了研究。结果表明,应变时效使试验钢产生脆化。随着应变时效温度的升高,强度和硬度增加,塑性和韧性下降。应变时效脆化形成的机制是管线钢间隙原子与位错的交互作用。与普通X80钢相比,大变形X80钢的应变时效倾向较小,这是因为双相组织中铁素体固溶的碳、氮原子少,位错密度低。 展开更多
关键词 大变形X80管线钢 应变时效 脆化
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Study on the Deformation Behavior of Mg-3.6%Er Magnesium Alloy 被引量:5
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作者 王忠军 贾维平 崔建忠 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第6期744-748,共5页
The deformation behaviour of a casting Mg-3.6% Er magnesium alloy after T6 treatment was studied in tensile tests from room temperature to 450 ℃ under different strain rates ranging from 1.0 ×10^-4 to 6.0 ×... The deformation behaviour of a casting Mg-3.6% Er magnesium alloy after T6 treatment was studied in tensile tests from room temperature to 450 ℃ under different strain rates ranging from 1.0 ×10^-4 to 6.0 × 10^-3 S^-1 Obtained local plateau in the temperature dependence of the ultimate strength (σb) and yield strength (σ0.2) under constant strain rate indicated the presence of dynamic strain ageing (DSA). Serrated flow was observed at the temperature of 200, 250, and 300 ℃. The observed negative strain rate sensitivity suggested that the serrated flow behavior arose from DSA. The temperature and strain rate dependence of the critical strain for the onset of serrated flow was analyzed using a phenomenological DSA equation, and the apparent activation energy Q for the serrated flow was obtained by calculation. 展开更多
关键词 Mg-3.6% Er alloy deformation behavior serrated flow dynamic strain aging rare earths
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受损H型钢梁力学性能静态应变时效影响研究
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作者 王之瀚 张宝军 +2 位作者 杨怡亭 王燕 李珂皓 《钢结构(中英文)》 2024年第8期1-10,共10页
既有钢结构建筑受损待修复期间,钢材受静态应变时效影响,其材料性能发生显著变化,致使受损钢结构修复后整体受力性能改变。为研究静态应变时效对受损钢梁受弯力学性能的影响,设计了3根Q355B热轧H型钢梁,通过两阶段加载试验方法完成受损... 既有钢结构建筑受损待修复期间,钢材受静态应变时效影响,其材料性能发生显著变化,致使受损钢结构修复后整体受力性能改变。为研究静态应变时效对受损钢梁受弯力学性能的影响,设计了3根Q355B热轧H型钢梁,通过两阶段加载试验方法完成受损钢梁应变时效影响试验研究,并基于试验结果建立ABAQUS有限元分析模型。通过二次模型导入和材性重定义,实现钢材经应变时效影响前后的不同材料属性建模,完成受损钢梁应变时效影响的有限元模型建立及参数分析。研究结果表明:受损钢梁的受力性能由残余变形和钢材力学性能变化两者共同决定,当钢梁发生损伤程度较小时,钢材力学性能变化不显著,钢梁因残余变形而极限承载力降低;当钢梁损伤变形导致部分截面应变达到4.5%及以上时,不再适合修复后继续使用。 展开更多
关键词 热轧H型钢梁 应变时效 部分损伤 抗弯性能
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304奥氏体不锈钢高温拉伸变形时的锯齿流变行为 被引量:5
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作者 王刚 李志刚 +1 位作者 韩鹏程 沈寅忠 《机械工程材料》 CAS CSCD 北大核心 2012年第6期64-67,共4页
对304奥氏体不锈钢进行拉伸试验,研究了其在高温拉伸变形过程中的锯齿流变行为。结果表明:当应变速率在2×10-4~2×10-3s-1范围内,试验钢发生动态应变时效的温度为773~973K;出现了A、A+B和E三种锯齿波和负的应变速率敏感系数... 对304奥氏体不锈钢进行拉伸试验,研究了其在高温拉伸变形过程中的锯齿流变行为。结果表明:当应变速率在2×10-4~2×10-3s-1范围内,试验钢发生动态应变时效的温度为773~973K;出现了A、A+B和E三种锯齿波和负的应变速率敏感系数;锯齿形成的有效激活能为212.8kJ.mol-1;铬和锰等置换型溶质原子与运动位错的交互作用使试验钢出现动态应变时效,导致锯齿流变行为的产生。 展开更多
关键词 304奥氏体不锈钢 动态应变时效 激活能 锯齿流变行为 高温
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Fracture toughness and fracture behavior of SA508-Ⅲ steel at different temperatures 被引量:2
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作者 Jia-hua Liu Lei Wang +3 位作者 Yang Liu Xiu Song Jiong Luo Dan Yuan 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第12期1187-1195,共9页
The fracture toughness of SA508-Ⅲ steel was studied in the temperature range from room temperature to 320℃ using the J-integral method. The fracture behavior of the steel was also investigated. It was found that the... The fracture toughness of SA508-Ⅲ steel was studied in the temperature range from room temperature to 320℃ using the J-integral method. The fracture behavior of the steel was also investigated. It was found that the conditional fracture toughness (JQ) of the steel first decreased and then increased with increasing test temperature. The maximum and minimum values of do were 517.4 kJ/m^2 at 25℃ and 304.5 kJ/m^2 at 180℃, respectively. Dynamic strain aging (DSA) was also observed to occur when the temperature exceeded 260℃ with a certain strain rate. Both the dislocation density and the number of small dislocation cells effectively increased because of the occurrence of DSA; as a consequence, crack propagation was more strongly inhibited in the steel. Simultaneously, an increasing number of fine carbides precipitated under high stress at temperatures greater than 260℃. Thus, the deformation resistance of the steel was improved and the Jo was enhanced. 展开更多
关键词 low alloyed steel fracture toughness fracture behavior TEMPERATURE dynamic strain aging nuclear power plants
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Effect of strain rate and temperature on the serration behavior of SA508-Ⅲ RPV steel in the dynamic strain aging process 被引量:1
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作者 Xue Bai Su-jun Wu +3 位作者 Li-jun Wei Shuai Luo Xie Xie Peter K. Liaw 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第7期767-775,共9页
Dynamic strain aging (DSA) effect on SA508-III reactor pressure vessel (RPV) steel was investigated. The SA508-III RPV steel was subjected to tension tests at different strain rates (1.1× 10-5 s-1 and 6.6... Dynamic strain aging (DSA) effect on SA508-III reactor pressure vessel (RPV) steel was investigated. The SA508-III RPV steel was subjected to tension tests at different strain rates (1.1× 10-5 s-1 and 6.6× 10-5 s-1) and different temperatures (500 and 550 ℃) to evaluate the influence of strain rate and temperature on the serrated flow behavior, which is the repetitive and discontinuous yielding phenomenon on the stress-strain curves. The higher temperature leads to the higher density of precipitates, M23C6 carbides and needle-like Mo2C carbides. It was found that the samples under tension test of 6.6 × 10-5 s-1 and 500 ℃ possess superior mechanical properties and mainly show A-type serrations on the tension test curves. Then, the local regress method was used to filter the DSA curves, thus to show the real trend of the curves. It has been found that the less time of interaction between dislocations and precipitates under higher strain rates leads to a higher strength of the sample. The more tiny-stress drops on the 550 ℃ serration curve can be attributed to the hardening phase, M23C6 carbides and needle-like Mo2C carbides. The higher percentage of the small stress drops on the serration curves represents the higher mechanical strength. 展开更多
关键词 Reactor pressure vessel steel SA508-Ⅲ steel Dynamic strain aging Serration behavior
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