Microstructure and wear resistance of NiCrBSi laser clad layer on titanium alloy substrate
Microstructure and wear resistance of NiCrBSi laser clad layer on titanium alloy substrate
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DOI：
10.1016/s0257-8972(00)00904-x
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发表时间：
2000-10
影响因子：
5.4
通讯作者：
R. Sun;D. Yang;L. X. Guo;S. Dong
中科院分区：
文献类型：
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作者：
R. Sun;D. Yang;L. X. Guo;S. Dong
在Ti-6Al-4V合金基体上进行NiCrBSi粉末激光熔覆，并对熔覆层的显微组织、显微硬度和耐磨性进行了评价。结果表明，激光熔覆层分为三个区域：熔覆区、稀释区和热影响区。熔覆区中，TiB2、TiC和M23(CB)6细颗粒分布在初生γ-Ni基体和由γ-Ni、Ni3B和硅化物组成的多相共晶物中。熔覆区的显微硬度很高，约为HV 1000。稀释区是熔化的镍基和钛基合金的混合物，具有定向结晶的特性。热影响区为针状马氏体组织，显微硬度为HV 360~380。与钛合金相比，熔覆层的耐磨性得到提高。熔覆层的磨损机理为轻微剥落和磨损混合型。
Laser cladding of NiCrBSi powders on Ti-6Al-4V alloy substrate was performed, and microstructure, microhardness and wear resistance of the clad layers were evaluated. Results show that the laser clad layer is divided into three regions: the clad, the dilution and the heat-affected zones. In the clad zone, fine particles of TiB2, TiC and M23(CB)6are distributed in the matrix of the primary γ-Ni and the multi-phase eutectics consisting of γ-Ni, Ni3B and silicides. Microhardness of the clad zone is very high, being approximately HV 1000. The dilution zone is a mixture of melted Ni-base and Ti-base alloys, and possesses a characteristic of directional crystallization. The heat-affected zone has an acicular martensitic structure, and the microhardness is HV 360–380. Compared to titanium alloy, the wear resistance of clad layer is improved. The mechanism of wearing of clad layer is a mixed type of slight peeling-off and abrasion.