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采用灰口铸铁作为基体材料,在不预热情况下通过增加Ni25过渡合金熔覆层,再用Ni45合金进行熔覆实验;由于过渡合金熔覆层中的Ni提高了奥氏体的稳定性,缓解了组织内产生的残余应力,减缓硬度梯度,多次堆焊加热使其热应力在该区域得到缓释,消除裂纹产生。同时又由于Ni45熔覆层中的高Cr使钢的共析成分点左移,同时产生Cr19Fe7Ni11金属化合物,因此提高了修复层的硬度,熔覆层厚度6mm。经修复后的罗茨鼓风机转鼓,加工后能满足机械装配精度及设备厂性能,耐磨性大大提高。
The gray cast iron was used as the base material, the Ni25 transitional alloy cladding layer was added without preheating, and then the Ni45 alloy was used for the cladding experiment. Because Ni in the transitional alloy cladding layer increased the stability of austenite, Relieve the residual stress generated in the organization, slow down the hardness gradient, repeated surfacing heating heat stress in the region to be sustained release, to eliminate cracks. At the same time, due to the high Cr in the Ni45 cladding, the eutectoid component point of the steel is shifted to the left and the Cr19Fe7Ni11 metal compound is produced at the same time. Therefore, the hardness of the repaired layer is increased, and the thickness of the cladding layer is 6mm. After the repair of the Roots blower drum, processed to meet the accuracy of mechanical assembly and plant performance, wear resistance greatly improved.