The Effects of Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of 9% Ni Steel Weld Joint with Fe-Based Filler Material

A Fe-based filler material with the composition of Fe-20Ni-5Co-2.5Mn-0.2C was used for welding 9% Ni steel, and effect post-weld heat treatment on microstructure mechanical properties welded joints investigated. Post-weld joint performed in temperature range 200 to 600 ℃. After experimental selection, changes weld metal base were investigated detail at temperatures 350 Grain morphology, size, location precipitated cementite studied using SEM EBSD phase maps. The characterized by tensile micro-hardness. Based results, this study provides key insights into applicability steel prepared improve properties, toughness ductility joints.