40MnB轧材表面裂纹原因分析  

Analysis of the Cause of Surface Cracks in 40MnB Steel

作　　者：于洪波 刘蕾 孟文贞 YU Hongbo;LIU Lei;MENG Wenzhen(Shandong Shouguang Juneng Special Steel Co.,Ltd.,Shouguang 262711,China)

机构地区：[1]山东寿光巨能特钢有限公司,山东寿光262711

出　　处：《山东冶金》2021年第4期16-18,共3页Shandong Metallurgy

摘　　要：针对40MnB钢轧材表面裂纹缺陷,通过金相组织观察和扫描电镜分析手段研究了裂纹缺陷。分析结果表明:40MnB钢轧材表面裂纹起源于铸坯的皮下气泡缺陷,经过轧制产生了宏观的纵向分布形貌。The surface crack defects of a batch of 40MnB steel rolling products were studied by means of metallographic structure observation and scanning electron microscope analysis.The results of metallographic study and electron microscope analysis show that the surface crack of 40MnB steel originates from the subcutaneous bubble defect of billet,and the macro longitudinal distribution morphology is produced after rolling.

关 键 词：40MnB钢 表面裂纹 夹杂物 皮下气泡 保护浇注 

分 类 号：TG142.1[一般工业技术—材料科学与工程]