冷轧中锰钢和等温淬火-碳配分钢裂纹扩展研究  

Study on Crack Growth of Cold-rolled Medium Manganese Steel and Quenching and Partitioning Steel

作　　者：周峰峦[1,2] 王存宇 曹文全[1] 董瀚[1,3] ZHOU Fengluan;WANG Cunyu;CAO Wenquan;DONG Han(Iron and Steel Research Institute,Special Steel Institute,Beijing 100081,China;AVIC Touchstone Testing Innovation Cooperation,Department of technology,Langfang 065000,China;Shanghai University,School of material science and engineering,Shanghai 200072,China)

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081 [2]中航试金石检测科技(大厂)有限公司技术部,廊坊065000 [3]上海大学科学与工程学院,上海200072

出　　处：《材料导报》2021年第8期164-168,共5页Materials Reports

基　　金：国家重点研发计划(2017YFB0304401,2016YFB0101605);国家自然科学基金(51571048)。

摘　　要：采用载荷控制对基体组织为铁素体和亚稳奥氏体的0.1C-5Mn中锰钢和基体组织为铁素体、马氏体和亚稳奥氏体的QP980进行裂纹扩展试验,采用SEM、EBSD等手段表征了裂纹扩展行为。研究结果表明,裂纹扩展机制为滑移和积累损伤双重机制。冷轧中锰钢和QP980在裂纹尖端的塑性区内均发生相变诱导塑性(TRIP)效应,转变为马氏体,冷轧中锰钢中亚稳奥氏体含量和稳定性高于QP980,QP980裂纹尖端奥氏体几乎都发生了转变,相变吸收了能量以及裂纹闭合效应降低了疲劳裂纹的扩展速率。The crack propagation of 0.1 C-5 Mn medium manganese steel with ferrite and metastable austenite as matrix and QP980 steel with ferrite,martensite and metastable austenite as matrix were tested by load control.The crack propagation behavior was characterized by SEM and EBSD.The results show that the crack propagation mechanism is composed of sliding and accumulation damage.In the plastic zone of the crack tip,TRIP effect occurred in both the cold-rolled medium manganese steel and QP980,which transfer into martensite.The content and stability of the metastable austenite in the cold rolled medium manganese steel are higher than that in QP980,and almost all the austenite at the crack tip of QP980 transformed.The fatigue crack propagation rate is reduced by the energy absorbed by phase transition and the crack closure effect.

关 键 词：裂纹扩展 亚稳奥氏体 马氏体相变 

分 类 号：TB31[一般工业技术—材料科学与工程]