摘要
实验选用具有高硬度、高熔点的WC硬质颗粒和韧性较好的Ni粉作为熔覆材料,采用激光熔覆技术在Ti-6Al-4V钛合金表面制备了致密WC增强Ni基复合涂层。通过光学显微镜、X射线衍射仪、扫描电镜及能谱仪、显微硬度仪对熔覆涂层的显微组织、物相、成分、硬度进行了研究。结果表明:实验采用WC∶Ni质量比为7∶3的粉末配比,在Ti-6A1-4V基体上制备了WC金属基复合涂层。涂层主要是由Ti2Ni、NiTi、WC、W_(2)C、TiC、α-Ti等组成,杆状、枝晶状的黑亮TiC、块状的WC分布于整个涂层中和部分针状物分布于靠近界面基体一侧。涂层显微硬度平均硬度大约为760 HV,基体的硬度大约为380 HV,涂层较基体硬度提高了约2倍,且从涂层表面到基体呈现平稳过渡的硬度梯度分布。
WC hard particles with high hardness and high melting point and Ni powder with good toughness were selected as cladding materials,and dense WC reinforced Ni matrix composite coating was prepared on the surface of Ti-6Al-4V titanium alloy by laser cladding technology.The microstructure,phase,composition and hardness of the cladding coating were studied by optical microscope,X-ray diffraction,scanning electron microscope,energy dispersive spectrometer and microhardness instrument.The results show that WC metal matrix composite coating is successfully prepared on Ti-6A1-4V substrate with WC∶Ni mass ratio of 7∶3.The coating is mainly composed of Ti2Ni,NiTi,WC,W_(2)C,TiC,α(Ti),rod-shaped and dendritic black bright TiC,and massive WC are distributed in the whole coating and some needles are distributed on the side near the interface matrix.The average microhardness of the coating is about 760 HV and the hardness of the substrate is about 380 HV.The hardness of the coating is about twice higher than that of the substrate,and there is a smooth transition hardness gradient distribution from the coating surface to the substrate.
作者
杨超
陈轩
肖寒
尹正培
李广杰
罗醒
YANG Chao;CHEN Xuan;XIAO Han;YIN Zhengpei;LI Guangjie;LUO Xing(Yunnan Titanium Industry Co.,Ltd.,Chuxiong 651209,China;Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Materials Science and Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《热加工工艺》
北大核心
2025年第2期44-47,共4页
Hot Working Technology
基金
云南省重大科技专项计划资助项目(202002AB080001)。
关键词
激光熔覆
涂层
WC增强相
laser cladding
coating
WC reinforced particles
