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采用铁基熔敷材料 ,在不预热情况下通过调整熔敷金属Ni含量 ,改变铸铁激光熔敷层内奥氏体相与渗碳体相体积分数 ,进而抑制熔敷层裂纹的产生。在抗裂性最佳激光熔敷工艺参数基础上 ,研究了Ni对熔敷层奥氏体体积分数及表面裂纹率的影响 ,揭示了熔敷层开裂的微观机制 ,获得了搭接 2 5道熔敷层不裂的Fe C Si Ni系熔敷材料。以此熔敷材料为基础 ,改变钛粉含量 ,在熔敷层得到原位自生TiC ,研究了TiC对熔敷层耐磨性的影响 ,分析了TiC数量对熔敷层磨损形貌及磨损质量损失的影响规律 ,最终获得了可显著提高熔敷层抗裂性及耐磨性的Fe C Si Ni Ti熔敷材料。
By using iron-based cladding material, the volume fraction of austenite phase and cementite phase in the laser clad layer of cast iron can be changed by adjusting the Ni content of the deposited metal without preheating, so as to suppress the occurrence of the weld layer crack. On the basis of the best anti-cracking laser cladding parameters, the effect of Ni on the volume fraction of austenite and the surface crack rate was studied. The microscopic mechanism of cracking was revealed and 25 laps Fe C Si Ni-based cladding material that does not crack the clad layer. Based on this welding material, the content of titanium powder was changed, and the in-situ TiC was deposited on the cladding layer. The effect of TiC on the wear resistance of the welding layer was studied. The effect of TiC content on the wear morphology and wear quality Loss of the law of the impact, finally obtained can significantly improve the weld layer crack resistance and wear resistance Fe C Si Ni Ti cladding material.