以45低合金铸钢为基体,研究了堆焊后热处理对铸钢熔合区组织及硬度的影响。结果表明,焊后经500~550℃回火处理,铸钢熔合区组织和硬度的过渡良好,并且能改善近熔合区的基体脱碳及焊层处的增碳现象,降低热影响区的粗晶脆化程度,减小相变应力和热应力,有利于防止基体开裂及耐磨层剥落。 Taking 45 low alloy cast steel as matrix, the effect of heat treatment after welding on the microstructure and hardness of the weld zone of cast steel was studied. The results show that the transition of microstructure and hardness in the fusion zone of cast steel is good after tempering at 500-550 ℃ after welding, and it can also improve the decarburization of matrix and the carbonation in the weld layer near the fusion zone, Degree of crystal embrittlement, reducing the phase change stress and thermal stress, is conducive to preventing the substrate cracking and wear layer peeling.