摘要
分析了激光焊接镍基合金时接头显微组织特征 ,对焊缝及焊接热影响区中热裂纹产生的原因 ,进行了初步探讨。研究认为 ,母材和焊缝中成分偏析及 (γ+γ’)低熔共晶的存在 。
The microstructure characteristics and the mechanism weld cracking formation in nickel superalloy (K3) laser welds were investigated. Solidification cracks were found in the weld metal as well as liquation cracks in the HAZ. Experiment results revealed that two factors are responsible for cracking formation, the segregation of the chemical composition of the material and the eutectic mixture (γ+γ′) in the weld metals and the HAZ. It was concluded that the cracking can be reduced considerably by using proper welding parameters.
出处
《应用激光》
CSCD
北大核心
2001年第5期309-312,共4页
Applied Laser
基金
高能束流加工技术重点实验室基金资助
