Effect of Solid-State Phase Transformation on Stress and Distortion for Fe-Co-Ni Ultra-High Strength Steel Components During Welding and Vacuum Gas Quenching Processes
Due to its outstanding all-around performance,Fe-Co-Ni ultra-high strength steel(UHSS)is frequently used in crucial load-bearing components.The UHSS components will be significantly de-formed during the welding and post-welding heat treatment operations,which makes the subsequent as-sembly to satisfy usage requirements a challenge.As a result,it is crucial to simulate the entire manufactur-ing process of UHSS components to investigate and comprehend the laws of stress and distortion in UHSS component weld joints throughout the manufacturing process.In this study,the"thermo-metallurgical-mechanical"coupled finite element model's accuracy is first verified,followed by the development of a heat source model for electron beam welding.The evolution of the microstructure of the weld joint,stress,and distortion in the weld joint of complex components are thus precisely predicted using the linked mod-el throughout the production process of"electron beam welding-vacuum gas quenching".The primary cause of the severe deformation of complex components is vacuum gas quenching.The solid-state phase transformation cannot be ignored in the simulation process of"electron beam welding-vacuum gas quenching"of the complicated components.
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