某受力耐磨铸钢件脆性断裂的原因分析及改善措施  

Cause analysis and improvement measures of brittle fracture of some stressed wear-resistant steel casting

作　　者：周子龙 白冬冬 潘多龙 杜天彬 吕昌略 ZHOU Zilong;BAI Dongdong;PAN Duolong;DU Tianbin;LV Changlve(Jiangsu Langrui Maoda Casting Co.,Ltd.,Jiangyin 214445,Jiangsu China)

机构地区：[1]江苏朗锐茂达铸造有限公司,江苏江阴214445

出　　处：《中国铸造装备与技术》2020年第1期51-54,共4页China Foundry Machinery & Technology

摘　　要：对断裂的受力耐磨铸钢件进行了化学成分、断口金相和能谱分析。分析结果表明受力耐磨铸钢件中残留铝含量偏高,当残留铝含量超过0.06%时,在一次奥氏体晶界上析出氮化铝而使晶界脆化,在恶劣工况运行条件下受力耐磨铸钢件产生脆断。The analysis of chemical composition,fracture metallography and energy spectrum has been carried out to the fractured wear-resistant steel casting.The analysis results show that the residual aluminum content in the wear-resistant steel casting is too high.When the residual aluminum content exceeds 0.06%,aluminum nitride is precipitated on the austenitic grain boundary to embrittle the grain boundary,which causes brittle happen to stressed wear-resistant steel casting under severe conditions.

关 键 词：铸钢件 残余铝含量 脆性断裂 

分 类 号：TG142.1[一般工业技术—材料科学与工程]