2019/10/31 by Soumya Sridar, Yunhao Zhao, Kun Li +2 · 1 citation
Engineering · Physics and Astronomy · #Additive Manufacturing Materials and Processes #Alloy #Fusion #High Entropy Alloys Studies #Materials science #Metallurgy #Welding Techniques and Residual Stresses #cond-mat.mtrl-sci #physics.app-ph
paper · pdf · doi:10.1016/j.msea.2020.139531
openalex publication_date 2020/05/11 · arxiv created 2020/05/12 · arxiv updated 2020/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this study, a post-heat treatment design for additively manufactured copper-bearing high-strength low-alloy (HSLA)-100 steel is performed by understanding the process-structure-property relationships. Hot isostatic pressing (HIP) is designed to reduce the porosity from 3% to less than 1% for the HSLA-100 steel processed by laser powder bed fusion (LPBF). Quenching dilatometry is employed to design the HIP parameters with the optimized cooling rate for the maximum amount of martensite transformed after HIP. Afterward, a post-heat treatment step with cyclic re-austenitization is introduced for an effective grain refinement to compensate the coarsened microstructure after HIP. Finally, tempering is optimized through microstructure characterization and microhardness. A two-fold increase in the yield strength of the HSLA with tailored microstructure during post-heat treatment is achieved in comparison with the as-built HSLA.