The microstructural evolution, mechanical and electrochemical properties of the rotary friction welding joint of 1MnCrMoNi maraging steel were investigated after post-weld heat treatment (PWHT). The joint could be divided into two zones: weld zone and thermo-mechanically affected zone. After PWHT, the parallel alignment of the laths turned 'blurred'; sub-grain and cell structure appeared; M23C6 and ε-Cu precipitated, respectively; the joint was softened. But the microhardness was still higher than that of base materials and distributed unevenly. The closer it was to the weld centre, the higher the microhardness was. No deformation occurred in the joints during tensile test, indicating the excellent bonding strength. PWHT process slightly reduced the impact toughness and corrosion resistance of the joint.
Pure Ni was employed as an intermediate interlayer in the dissimilar 1MnCrMoNi/X70 steels friction welding joint. The effect of the Ni interlayer on the microstructure, mechanical and corrosion properties of the joint was investigated. Compared with the Ni-free joint, the joint with the Ni interlayer had coarser microstructure and lower microhardness. Furthermore, the weld zone of the 1MnCrMoNi steel was abnormally harder than the adjacent thermo-mechanically affected zone. The tensile strength of the joint with the Ni interlayer was improved, and this joint also demonstrated a lower yield ratio, equivalent impact toughness, and enhanced corrosion resistance.
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