Phase Transformation, Microstructure, and Mechanical Properties on Nickel-Free High Chromium Weld Metal

High chromiumChromium Ferritic-martensitic (FM) steelsSteel are employed for especially thermal and nuclear power plant because of their low thermal expansion, corrosionCorrosion resistance, and creep performance. In this study, weld metalMetals phase transformationPhase transformations and mechanical propertiesMechanical properties oh high chromiumChromium steelSteel without Ni were investigated. The microstructureMicrostructure of produced all weld metalMetals were characterized by optical microscope (OM), scanning electron microscopy (SEM) with EDS. In addition, Thermo-Calc software was used to consider thermodynamic equilibrium stages and phase transformationsPhase transformations. Differential scanning calorimetry (DSC) was employed in order to detect A1, A2, A3, and Ms-Mf temperatureTemperature. Weld metalMetals microstructureMicrostructure has tempered martensitic also precipitates observed mostly in the PAGB and lath boundary. α → γ transformation 834 °C and Curie temperatureTemperature 737 °C observed by DSC. Impact energy at 25 °C 57J while 60 °C was 97J observed.