膨胀管用TWIP钢30Mn25Cr10Ni2MoNbRe应变硬化的微观机理  

Strain Hardening Microscopic Mechanism of TWIP Steel 30Mn25Cr10Ni2MoNbRe for Expansion Pipe

作　　者：阳义[1] 李春福[1] 胡志强[1] 陈庆勇[1] 

机构地区：[1]西南石油大学油气藏地质及开发国家重点实验室,四川成都610500

出　　处：《热加工工艺》2012年第20期85-88,共4页Hot Working Technology

摘　　要：应用固体与分子经验电子理论计算、组织结构分析和拉伸试验研究了石油膨胀管用TWIP钢30Mn25Cr10Ni2MoNbRe在298 K变形力学性能及微观结构的变化规律。结果表明,合金原子的溶入使键络共价电子数增加,键络增强,C-Me原子偏聚进一步阻碍位错运动;形变还导致了大量孪晶界面。从电子结构层次分析形变过程中加工硬化现象的微观机理,得出该合金在298 K变形下的加工硬化主要是Fe-C-Me原子团硬化与形变孪晶界面硬化共同作用的结果。The mechanical properties and microstructure change of 30Mn25Cr10Ni2MoNbRe at 298 K were studied by empirical electron theory of solids and molecules, analysis of microstructure and tensile test. The results show that alloy atoms can cause an increase in number of valence electron and strength in bond, and the segregation of C-Me atoms can hinder the movement of dislocation. By analyzing the microscopic mechanism of strain hardening in deformation process from electronic structure, it can conclude that the hardening of Fe-C-Me atoms and deformation twinning interfaces are the main reasons for the strain hardening of 30Mn25Cr10Ni2MoNbRe in 298 K deformation process.

关 键 词：TWIP钢 固体与分子经验电子理论 形变孪晶 加工硬化 

分 类 号：TG113.1[金属学及工艺—物理冶金]