770 MPa级调质铸钢液态金属致脆失效原因及相应防护对策
Failure Reason and Protection Countermeasures on Liquid Metal Induced Embrittlement of 770 MPa Grade Quenched and Tempered Steel Casting
杨永强 1马晓健 2王鹏 3刘露芊 3郑春雷3
作者信息
- 1. 久益环球(天津)装备制造有限公司,天津 300308
- 2. 唐山开元自动焊接装备有限公司,唐山 063000
- 3. 燕山大学,秦皇岛 066004
- 折叠
摘要
采用金相显微镜、电子扫描显微镜等对某大型截面铸钢工件裂纹成因进行了分析.结果表明:开裂高强度调质铸钢,在热浸锌过程中,基体产生了垂直于表面的裂纹,裂纹长度约为3 mm,且裂纹沿晶开裂.能谱结果表明,裂纹中富含大量锌,为典型的液态金属致脆现象.针对此情况,在热浸锌工艺、焊接工艺、成型工艺、涂装体系等方面给出了避免产生液态金属致脆的防护对策.
Abstract
The causes of cracks in a large cross-section cast steel workpiece were analyzed using metallographic microscopy,electron scanning microscopy,and other methods.The results show that during the hot-dip galvanizing process of high-strength quenched and tempered cast steel,cracks perpendicular to the surface were generated in the matrix,with a crack length of about 3 mm,and the cracks cracked along the grain.The energy spectrum results indicated that the cracks contained a large amount of zinc,which was a typical liquid metal embrittlement phenomenon.In response to this situation,protective measures were proposed to avoid liquid metal embrittlement through hot-dip galvanizing process,welding process,forming process,coating system and other aspects.
关键词
液态金属致脆/调质铸钢/热浸锌/沿晶裂纹Key words
liquid metal induced embrittlement/quenched and tempered steel casting/hot dip galvanizing/intergranular crack引用本文复制引用
出版年
2024
NETL
NSTL
万方数据