Effects of pre-tempering on the microstructure, hardness and impact toughness of the 2.25Cr–1Mo-0.25V heat-resistant steel weld metal

In this study, the effects of pre-tempering on microstructure, hardness, impact toughness and fracture modes of weld metals in 2.25Cr–1Mo-0.25 V heat-resistant steel were investigated. Four weld metals with as-welded, three different post welding heat treatments were chosen as the investigated materials. Optical Microscopy (OM), Scanning Electron Microscope (SEM) were used to evaluate the microstructures of the weld metals. The mechanical...