Investigation on residual stress, microstructure, and properties of the electron beam welded Haynes 230-based thin-walled piece

Abstract

Haynes 230 material is an important high-temperature alloy used in many significant applications. Electron beam welding (EBW) process is necessary for Haynes 230 to realize some complex structures. In this study, by combining three-dimensional finite element simulation with different experimental methods, the thermal behavior, residual stress, microstructure, and mechanical properties of Haynes 230 thin-walled weldment made by EBW were comprehensively investigated. The EBW process would induce an uneven temperature distribution in the weldment, which then results in a large amount of tensile residual stress. Sufficient amount of precipitates was generated to provide enough enhancement for the strength. The quality of the weldment was good to provide comparable strength to the base metal. This study could offer important information for the application of EBW welded Haynes 230 material, especially in the thin-walled workpieces that are used in hot-end components of combustion gas turbines.