35CrMo钢锭样坯裂纹成因分析  

Analysis on the Crack Causes of 35CrMo Ingot Billet

作　　者：李志霞 王秋萍 苏斯燕 白嘉伟 LI Zhi-xia;WANG Qiu-ping;SU Si-yan;BAI Jia-wei(Machinery Industry Lanzhou Petrochemical Equipment Testing Co.,Ltd.,Lanzhou Gansu 730314,China;Gansu Lanke Petrochemical High-tech Equipment Co.,Ltd.,Lanzhou Gansu 730314,China)

机构地区：[1]机械工业兰州石油化工设备检测所有限公司,甘肃兰州730070 [2]甘肃蓝科石化高新装备股份有限公司,甘肃兰州730070

出　　处：《热处理技术与装备》2024年第1期45-47,52,共4页Heat Treatment Technology and Equipment

摘　　要：35CrMo液压室钢锭样坯在精加工时发现内孔壁有多条细微裂纹。为了查找裂纹成因,取样进行化学成分分析、低倍检验、金相检验和EDS分析。结果表明液压室钢锭样坯微裂纹系锻造时白点缺陷。分析了白点缺陷形成的主要因素为氢浓度、内应力(主要是组织应力)和夹杂物,在此基础上提出了白点缺陷的主要预防措施。A number of small cracks in the inner hole wall had been found in 35CrMo hydraulic chamber steel ingot sample billet during the finishing process.In order to find the cause of cracks,the sample was taken for chemical composition analysis,macroscopic examination,metallographic examination and EDS analysis.The results showed that the microcracks of ingot samples in hydraulic chamber were white spot defects during forging.The main factors causing the formation of white spot defects ware analyzed,including hydrogen concentration,internal stress(mainly tissue stress)and inclusion,on the basis of the main preventive measures for white spot defects were put forward.

关 键 词：夹杂物 氢含量 应力 白点缺陷 

分 类 号：TG142.41[一般工业技术—材料科学与工程]