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
谭清元1, 吴 巍1, 贾至立1, 周远华2
点击：2991次 下载：0次
作者单位：(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)
中文关键字：中厚板； 微裂纹 ； 异常组织
英文关键字：medium and heavy plate; micro-cracks; abnormal microstructure
中文摘要：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。
英文摘要：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.