理化检验-物理分册2024，Vol.60Issue(3)：41-44,48,5.DOI:10.11973/lhjy-wl202403010
G18NiMoCr3-6铸钢焊接接头低温冲击性能不合格原因
Reasons for unqualified low temperature impact performance of G18NiMoCr3-6 cast steel welded joints
李明 1李金红 1李辉 1刘月1
作者信息
- 1. 锦州捷通铁路机械股份有限公司 检测中心,锦州 121116
- 折叠
摘要
Abstract
The low temperature(-40℃)impact performance of a G18NiMoCr3-6 cast steel welded joint was unqualified.The reasons for the unqualified low temperature impact performance of welded joints were analyzed using methods such as mechanical performance testing,macroscopic observation,chemical composition analysis,scanning electron microscopy and energy spectrum analysis,metallographic examination and tempering process test.The results show that when the weld metal was tempered at 560℃,Fe3C thin shells precipitated at the original austenite grain boundaries,reducing the grain boundary bonding force,resulting in high-temperature tempering brittleness of the material.The ductile-brittle transition temperature of the material increased,ultimately led to low temperature brittle fracture of the material.关键词
G18NiMoCr3-6铸钢/焊接接头/低温冲击性能/回火脆性Key words
G18NiMoCr3-6 cast steel/welding joint/low temperature impact performance/temper分类
通用工业技术引用本文复制引用
李明,李金红,李辉,刘月..G18NiMoCr3-6铸钢焊接接头低温冲击性能不合格原因[J].理化检验-物理分册,2024,60(3):41-44,48,5.
