摘要
为了研究基体组织为铁素体和亚稳奥氏体的0.13C-5Mn中锰钢裂纹扩展特性,采用载荷控制对其进行裂纹扩展试验,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。在裂纹尖端的塑性区内发生亚稳奥氏体转变为马氏体的相变,发生转变的区域远远小于裂纹尖端塑性区尺寸,由于相变吸收了能量以及裂纹闭合效应降低了疲劳裂纹扩展速率。
In order to study the crack propagation characteristics of medium manganese steel in 0.13 C-5 Mn whose matrix is ferrite and metastable austenite,the crack propagation test was carried out by load control,and the crack propagation behavior was characterized by SEM and EBSD.The results show that the crack propagation mechanism is a double mechanism of slip and accumulation damage.In the plastic zone of crack tip,the transition of metastable austenite to martensite is much smaller than that of plastic zone at crack tip,and the fatigue crack propagation rate is reduced due to the absorption of energy by phase change and crack closure effect.
作者
周峰峦
王存宇
雷志国
曹文全
董瀚
ZHOU Feng-luan;WANG Cun-yu;LEI Zhi-guo;CAO Wen-quan;DONG Han(Institute of Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China;Testing Center,NCS Testing Technology Co.,Ltd.,Beijing 100081,China;Institute of Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;School of Material Science and Engineering,Shanghai University,Shanghai 200072,China)
出处
《钢铁》
CAS
CSCD
北大核心
2019年第12期75-80,88,共7页
Iron and Steel
基金
国家重点研发计划资助项目(2017YFB0304401,2016YFB0101605)
国家自然科学基金资助项目(51571048)
关键词
中锰钢
裂纹扩展
马氏体相变
medium manganese steel
crack propagation
martensite phase transformation
