钛合金表面激光熔覆CoCrMo强化涂层路径选择与质量分析  

Path selection and quality analysis of laser clad CoCrMo strengthened coating on titanium alloy surface

作　　者：商鹏[1] 李景曼 张艺海 张杰 夏磊 张大卫[3] Shang Peng;Li Jingman;Zhang Yihai;Zhang Jie;Xia Lei;Zhang Dawei(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China;Additive Manufacturing Technology Promotion Center,Tianjin Vocational University,Tianjin 300350,China;School of Mechanical Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]河北工业大学机械工程学院,天津300130 [2]天津职业大学增材制造技术推广中心,天津300350 [3]天津大学机械工程学院,天津300072

出　　处：《金属热处理》2021年第5期207-212,共6页Heat Treatment of Metals

基　　金：河北省高等学校科学技术研究重点项目(ZD2020124);天津大学机构理论与装备设计教育部重点实验室开放项目。

摘　　要：针对生物医学上常用的钛合金材料表面硬度与耐磨性较差的问题,尝试采用同轴送粉激光熔覆技术,在纯钛板上制备CoCrMo新型高硬度耐磨熔覆层。为了保证熔覆层质量,在工艺参数优化的基础上,设计了单向搭接、矩形嵌套搭接和圆形螺旋搭接3种不同扫描路径。结果表明,通过对3种不同扫描路径下激光熔覆样件的宏/微观显微组织的对比分析,发现单向搭接方式得到的样件表面质量最佳,且熔覆层显微组织形态最优。因此选取该方式制备的最佳样件,进一步检测分析其硬度和耐磨性数据,发现与基材相比,熔覆层硬度有显著提高,为基材的5~6倍,耐磨性也获得明显提高。In view of the poor surface hardness and wear resistance of titanium alloy,commonly used as artificial bone material in biomedicine,a new type of high hardness wear-resistant clad layer was prepared on pure titanium plate by laser cladding with CoCrMo powder.In order to ensure the clad layer quality,three different scanning paths were designed,including unidirectional overlapping,rectangular nested overlapping and circular spiral overlapping.The results show that through the micro and macro structure comparison of laser clad specimens under three different scanning paths,it is found that the surface quality of laser clad specimens obtained by unidirectional overlapping is the best,and the microstructure of which is the best.Therefore,the best specimens prepared by unidirectional overlapping were selected to further test and analyze the hardness and wear resistance.It is found that compared with the substrate,the hardness of the clad layer is significantly improved by 5-6 times of that of the substrate,and the wear resistance is also improved significantly.

关 键 词：钛合金 激光熔覆 钴铬钼粉 表面改性 工艺优化 

分 类 号：TG146.2[一般工业技术—材料科学与工程]