Microstructure Characteristics of an Fe-Mn-C TWIP Steel After Deformation  

作　　者：DAI Yong-juan TANG Di MI Zhen-li LU Jian-chong 

机构地区：[1]National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China [2]School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China

出　　处：《Journal of Iron and Steel Research International》2010年第9期53-59,共7页

基　　金：Item Sponsored by National High-Technology Research and Development Program(2008AA03E502);National Natural Science Foundation of China(50575022)

摘　　要：The microstructure characteristics of an Fe-Mn-C TWIP steel after deformation are investigated. The results show that the hot-rolled, cold-rolled and then annealed sample of the Fe-Mn-C TWIP steel has excellent mechanical properties, and the true stress-true strain curve from tension tests exhibits repeated serrations. The deformed microstructure exhibits the typical planar glide characteristics such as no cell formation, dislocation pile-ups on a single slip plane, mechanical twins and stacking faults. There are equiaxial and deep dimple structures in the fractograph, indicative of a ductile fracture. Microcracks initiate from inclusions and twin-twin intersections. Deformation and fracture processes are the formation, growth and coalescence of microvoids.The microstructure characteristics of an Fe-Mn-C TWIP steel after deformation are investigated. The results show that the hot-rolled, cold-rolled and then annealed sample of the Fe-Mn-C TWIP steel has excellent mechanical properties, and the true stress-true strain curve from tension tests exhibits repeated serrations. The deformed microstructure exhibits the typical planar glide characteristics such as no cell formation, dislocation pile-ups on a single slip plane, mechanical twins and stacking faults. There are equiaxial and deep dimple structures in the fractograph, indicative of a ductile fracture. Microcracks initiate from inclusions and twin-twin intersections. Deformation and fracture processes are the formation, growth and coalescence of microvoids.

关 键 词：planar glide deformed twinning stack fault energy ductile fracture 

分 类 号：TU452[建筑科学—岩土工程] TQ175.732[建筑科学—土工工程]