Q345A中厚板内部微裂纹形成原因分析  

Reason Analysis on Micro-cracks in Medium and Heavy Plate of Q345A Steel

作　　者：谭清元[1] 吴巍[1] 贾至立[1] 周远华 

机构地区：[1]钢铁研究总院冶金工艺研究所,北京100081 [2]重庆钢铁股份有限公司,重庆400081

出　　处：《热加工工艺》2011年第2期195-198,共4页Hot Working Technology

摘　　要：Q345A中厚板内部微裂纹分布在珠光体、贝氏体及马氏体带状组织等异常组织中,能谱分析发现异常组织存在C、Mn元素的富集,即成分偏析导致心部异常组织的产生,而异常组织及其中的条状MnS、氮化物等夹杂与钢基体的界面往往成为裂纹源,在轧后冷却或矫直过程中张应力作用下钢板内部产生裂纹。Micro-cracks in the plate have three kinds of abnormal microstructure,which are pearlite,bainite and martensite banded microstructure.The concentration of carbon and manganese was found in the abnormal microstructure by energy spectrum analysis,that is,the segregation of composition forms in the abnormal microstructure,the interfaces between steel basic phase and abnormal microstructure or inclusions such as MnS and nitride are the sources of micro-cracks,which can result in cracks by the tensile stress during cooling and straightening.

关 键 词：中厚板 微裂纹 异常组织 

分 类 号：TG115.2[金属学及工艺—物理冶金]