KmTBCr15Mo表面激光熔覆原位合成TiC-VC增强镍基熔覆层的工艺研究

利用横流CO_2激光器,选用不同配比的钛铁粉(FeTi70)、钒铁粉(FeV50)、石墨和Ni60自熔性粉末在铸铁KmTBCr15Mo表面进行激光熔覆处理,通过原位自生法制备出TiC-VC增强相镍基涂层,并研究了激光熔覆工艺参数对熔覆层组织和性能的影响。结果表明:激光熔覆层的微观质量和耐磨性能与激光熔覆工艺参数密切相关,在优化的激光工艺参数(激光功率2.4kW,离焦量30mm,激光扫描速度250mm/min)下获得的熔覆层耐磨性最好。

Study on Ni-based Composite Coatings Reinforced by TiC-VC Synthesized in Situ on KmTBCr15Mo by Laser Cladding

Using transverse CO2 laser and selecting different proportion of FeTi70,FeV50,graphite power and Ni60,the Ni-based cladding layer reinforced by in-situ fabricated TiC-VC is prepared on the surface of the KmTBCr15Mo by laser cladding. The influences of processing parameters on microstructure and properties of the cladding layer have been studied. The results show that processing parameters are closely related to micro-quality and wearability ,and the optimized laser processing parameters are as follows:laser power is 2.4 kW ,scanning speed is 250 mm/min and the defocusing amount is 30 mm.