氮强化高锰奥氏体低温钢的拉伸应变硬化行为

材料研究学报, 2005, 19(2): 193-199. doi: 10.3321/j.issn:1005-3093.2005.02.014

氮强化高锰奥氏体低温钢的拉伸应变硬化行为

付瑞东 ^1, , 邱亮 ^2, , 王存宇 ^3, , 郑炀曾 ^4,

1.燕山大学

2.燕山大学

3.燕山大学

4.燕山大学

基金项目: 机械技术发展基金(92J50601) 河北省自然科学基金(E2004000197) 中国科学院资助项目(59771001)

关键词：金属材料 , 高锰奥氏体钢 , 氮强化 , 应变硬化 , 孪生 , 位错

Tensile strain hardening behaviours of nitrogen strengthening high manganese austenitic cryogenic steel

采用低温拉伸、SEM和TEM等方法,对32Mn-7Cr-1Mo-0.3N奥氏体钢进行表征,研究了它的拉伸应变硬化行为.结果表明,32Mn-7Cr-1Mo-0.3N奥氏体钢的真应力与真应变不遵循Hollomon的线性关系,应变硬化指数n随着真应变的增大而提高,但当ε>0.2后,77 K下的dn/dε值明显高于其它温度的值.在77 K真应变ε>0.2后材料的d2σ/dε2变为正值.dn/dε与d2σ/dε2这一特殊变化趋势导致77 K下应变硬化率和延伸率的提高.其微观机制是,孪晶的形成速率以及孪晶与位错之间的相互作用与硬化率相协调,进而延迟了颈缩的产生,导致较高的均匀变形能力.

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氮强化高锰奥氏体低温钢的拉伸应变硬化行为

Tensile strain hardening behaviours of nitrogen strengthening high manganese austenitic cryogenic steel

参考文献