在钛合金 TC4(Ti-6Al-4V)表面利用激光熔覆 Co-WC 复合涂层,利用扫描电镜(SEM)、能谱分析仪(EDS)和硬度计研究涂层的微观组织及力学性能.结果表明,Co ＋15％ WC、Co ＋30％ WC 及 Co ＋45％WC 试样熔覆层与基体都实现了冶金结合,表层激光熔覆层涂层内组织均匀致密,没有气孔、裂纹等缺陷.而 Co＋60％WC 试样虽然熔覆层与基体界面也为冶金结合,但是熔覆层内发生了开裂.激光熔覆 Co-WC复合熔覆层的宏观洛氏硬度较 TC4基体提升了2~3倍,合金粉末中 WC 的含量比例越高,熔覆涂层试样的宏观洛氏硬度的提升越明显.4种熔覆试样从基体到熔覆层表面,其显微硬度都是逐渐升高的趋势,熔覆层表面显微硬度达到 TC4基体的显微硬度的近 3倍.在 Co 基合金粉末中添加 WC 的最大含量为45％,高于45％之后,熔覆层显微硬度值下降.
The Co-WC composite coatings were fabricated by laser cladding on titanium alloy TC4 (Ti-6Al-4V) surface.Microstructure and mechanical property were studied by scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and sclerometer.The results indicate that metallurgical combination are imple-mented between coatings and substrates of Co+ 15%WC,Co+30%WC and Co+45%WC samples,and uni-formity and compact microstructure are showed without pore and cracking flaws.Cracking flaws were discov-ered in cladding layer of Co+60%WC sample,though metallurgical combination was realized between the coat-ing the substrate.Macrorockwell hardness of Co-WC composite coatings were increased by 2-3 times than TC4 substrate,and the value increases more obviously along with the increasing of the content of WC in alloy pow-der.For four cladding samples from the substrate to the surface of cladding layer,the microhardness was gradu-ally increased,and the microhardness value of the cladding layer were nearly three times higher than TC4 sub-strate.Maximum content of WC added in the Co base alloy powder was 45%,when the content was higher than 45%,microhardness of the cladding layer was decreased.
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