Effect of heat treatment and cooling rate on microstructure and properties of T92 welded joint

The effects of heat treatment and cooling rate on the microstructure and properties of T92 welded joints were studied. Under the same tempering holding time, the diffusion ability in the deposited metal increased as the tempering temperature increased. The phase-change temperature was lower than the A_C1 points. In the 5-20s range of t_8/5, the deposited metal toughness decreased as the cooling rate increased. When the t_8/5 was equal to 70s, the toughness increased and the hardness decreased. The higher heat input induced coarse grain tendency. The lower welding heat input should be used in conjunction with the reasonable post-weld heat treatment.