摘要
针对现场出现的轧辊热疲劳裂纹较严重问题,研究了高铬铸钢轧辊热疲劳过程的组织和性能.通过约束热疲劳实验及高温拉伸实验,获得了热疲劳循环次数与主裂纹长度的关系,测试了高温状态下材料机械性能.用SEM,EDS分析了晶粒组织、成分偏析对热疲劳裂纹扩展的影响.结果表明:高铬铸钢轧辊的表面状态影响热疲劳裂纹萌生、扩展路径和方式;热循环上限温度及升温速度对裂纹扩展速率的影响较大;材料性能、组织变化等对高铬铸钢的热疲劳性能有明显影响.
The microstructure and properties of high chromium cast steel roll were studied to solve the serious thermal fatigue（TF） cracks in the surface of the roll.The relationship between TF cycles and main TF crack length was obtained by self-constrained TF tests and stretching tests at high temperatures.The mechanical properties at high temperatures were measured.The effect of microstructure and segregation on TF crack propagation was analyzed by SEM and EDS.The results showed that the route and manner of TF cracks initiation and propagation depend on the surface appearance of the roll.The speed of crack propagation is related to the high limit of temperature and heating speed of thermal cycles.In addition,TF performance is affected by the roll properties and microstructure change.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第10期1414-1417,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(50974039)
东北大学轧制技术及连轧自动化国家重点实验室开放课题(2006- 1)
关键词
热轧
高铬铸钢轧辊
热疲劳
裂纹萌生和扩展
hot rolling
high Cr cast steel roll
thermal fatigue
crack initiation and propagation
