Significantly improved weldability in laser welding of additively manufactured haynes 230 superalloys by tailoring microstructure

• DOI: 10.1016/j.jmrt.2023.09.134
• Publication Date: 2023-09-16T02:51:12Z
• Authors: Danyang lin; Xin Xi; Mengzhe Yan; Rui Ma; Zhifeng Shi; Zhengxin Tang; Zihan Li; Caiwang Tan; Zhibo Dong; Xiaoguo Song
• Keywords: Weldability

Owing to restrictions on forming dimensions, laser powder bed fusion (LPBF) components will continue require welding in the future. The post-weld thermal cracking of LPBF-Haynes 230 superalloys has become a key issue hindering their assembly service. In this study, it was found that both continuous TCP phase and M5Si3 silicides near crack have large interface strain with matrix. Replacing C Si atoms B at reduces melting point carbides grain boundaries (GBs), thereby inducing solidification under residual tensile stress weld waist. weldability alloy is influenced by characteristics base metal (BM). Compared parallel welds, vertical welds are inherited from BM exhibit smaller grains. Moreover, reducing heat treatment (HT) time temperature, size misorientation reduced into weld. GB area increases 37% energy decreases 7.3%, increasing resistance extension. addition, decreased HT temperature inhibits carbide growth GBs, between matrix heat-affected zone correspondingly its sensitivity. This study provides theoretical guidance for improving LPBF help accelerate successful application superalloy assemblies engines.