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烧结不锈钢丝网多孔板材的结构表征及冲击性能 被引量:2

Structural Representation and Charpy Impact Properties of Sintered Stainless Steel Wire Mesh Porous Plates
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摘要 以不锈钢丝网和不锈钢粉末为原材料,经过卷绕、压制、轧制和烧结工艺制造了烧结不锈钢丝网多孔板材.研究了不锈钢多孔板的孔隙结构特征和冲击力学性能,并进一步分析了孔隙率、原材料丝径及烧结参数对冲击性能的影响.结果表明:不含粉末的多孔板内的空隙呈规则的矩形,且孔隙尺寸分布均匀,孔隙尺寸分布范围较小;含有粉末的多孔板内的空隙形状复杂多变,孔隙尺寸分布范围较宽;多孔板的成型烧结温度越高,其冲击韧性越高;原材料丝径越粗,冲击韧性越好;材料孔隙率越低,冲击韧性越高;孔隙率对于冲击性能的影响最为显著,材料孔隙率从10. 64%上升到29. 18%时,不锈钢多孔板的冲击韧性从26. 32J/cm2下降到了8. 02 J/cm2.根据冲击试样断裂的宏观和微观形貌分析推断,材料在冲击载荷下经过了致密化、裂纹萌生、裂纹扩展、冶金结合点破坏、应力迅速上升后断裂几个过程,金属丝骨架断裂为典型的韧性断裂,在断裂时受到了轴向拉伸应力和垂直于断裂方向的剪切应力. Sintered stainless steel wire mesh porous plates have been prepared by winding,rolling and subsequently vacuum sintering.This paper investigates the pore size and size distribution,and the charpy impact properties of the stainless steel porous plates.Further studies of the effects on the impact properties by porosities,wire diameters and sintering parameters are performed.The results indicate that for the stainless steel porous plates prepared by the wire mesh,the pore structures are inerratic rectangles and the pore size distributes uniformly;as for the stainless steel porous plates prepared by wire mesh and powder,the pore structures are irregular;porosity of the stainless steel porous plates produces a major effect on their impact property,the impact toughness decreases from 26.32 J/cm 2 to 8.02 J/cm 2 along with the porosity increasing from 10.64%to 29.18%;the impact toughness increases with the sintering temperature being raised and the wire diameter becoming thick.On the basis of macro and micro fracture morphology,the fracture of the specimens under impact load can be inducted as follows:densification,crack initiation,crack propagation,metallurgical joints broken and finally fracture.According to the fracture styles,the wires endure the tensile stress and shear stress before they rupture.
作者 段留洋 周照耀 姚碧波 DUAN Liuyang;ZHOU Zhaoyao;YAO Bibo(School of Mechanical and Automotive Engineering∥National Engineering Research Center of Near-Net-Shape Forming For Metallic Materials,South China University of Technology,Guangzhou 510640,Guangdong,China)
出处 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2018年第7期85-93,共9页 Journal of South China University of Technology(Natural Science Edition)
基金 广东省科技计划项目(2016A010103006) 广州市科技计划项目(201604016015)~~
关键词 不锈钢金属丝网 金属粉末 金属多孔材料 孔隙率 冲击性能 冲击韧性 stainless steel wire mesh metal powder metal porous materials porosities impact property impact toughness
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