摘要
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 implemented between coatings and substrates of Co+15% WC,Co+30% WC and Co+45% WC samples,and uniformity and compact microstructure are showed without pore and cracking flaws.Cracking flaws were discovered in cladding layer of Co+60%WC sample,though metallurgical combination was realized between the coating the substrate.Macrorockwell hardness of Co-WC composite coatings were increased by 2-3times than TC4 substrate,and the value increases more obviously along with the increasing of the content of WC in alloy powder.For four cladding samples from the substrate to the surface of cladding layer,the microhardness was gradually increased,and the microhardness value of the cladding layer were nearly three times higher than TC4 substrate.Maximum content of WC added in the Co base alloy powder was 45%,when the content was higher than45%,microhardness of the cladding layer was decreased.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2015年第7期7025-7029,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50961008
51061008)
国家重点基础研究发展计划(973计划)资助项目(2011CB612203)
甘肃省有色金属新材料省部共建国家重点实验室开放基金资助项目(SKL12008)
甘肃省科技计划资助项目(145RJZA090)
关键词
钛合金
激光熔覆
钴基合金粉末
组织
硬度
titanium alloy
laser cladding
Co base alloy powder
microstructure
hardness
