高应变速率下共析珠光体钢的微观组织演变

材料热处理学报, 2014, 35(9): 55-59.

高应变速率下共析珠光体钢的微观组织演变

何红玉 ^1, , 熊毅 ^2, , 李鹏燕 ^3, , 陈路飞 ^4, , 路妍 ^5, , 张凌峰 ^6,

1.河南科技大学材料科学与工程学院,河南洛阳471003

2.河南科技大学材料科学与工程学院,河南洛阳471003;有色金属共性技术河南省协同创新中心,河南洛阳471003

3.河南科技大学材料科学与工程学院,河南洛阳471003

4.河南科技大学材料科学与工程学院,河南洛阳471003

5.河南科技大学材料科学与工程学院,河南洛阳471003

6.河南科技大学材料科学与工程学院,河南洛阳471003;有色金属共性技术河南省协同创新中心,河南洛阳471003

基金项目: 河南省基础与前沿技术研究计划(132300413212) 河南省高等学校青年骨干教师资助项目(2011GGJS-070) 国家自然科学基金(50801021,51201061)

关键词：共析珠光体钢 , 高应变速率 , 绝热剪切带 , 超微细复相组织

Microstructure evolution of eutectoid pearlitic steel under high strain rate deformation

Keywords： eutectoid pearlitic steel , high strain rate , adiabatic shear band , ultrafine microduplex structure

利用分离式霍普金森压杆(SHPB)对原始组织为层片状珠光体的高碳钢进行了高应变速率变形实验,借助SEM、TEM对变形后珠光体的微观组织演变规律进行了分析研究.结果表明:在高应变速率变形条件下,共析珠光体钢发生绝热剪切现象,原始珠光体组织中存在着绝热剪切带,绝热剪切带的宽度约为1.5 μm,绝热剪切带外部区域存在着高密度位错、位错胞以及亚晶,而绝热剪切带内部区域则在动态回复和动态再结晶的作用下演变成晶粒尺度均在亚微米量级的超微细复相组织(铁素体+渗碳体).

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