刘金刚,杨建花,王高升,李毅,郑剑云.TC4钛合金表面激光熔覆WC增强镍基复合涂层的组织及耐磨性[J].稀有金属材料与工程,2022,51(8):2907~2914.[liu jin gang,yang jian hua,wang gao sheng,li yi,zhen jian yun.Microstructure and wear resistance of laser cladding WC reinforced Ni based composite coating on TC4 titanium alloy[J].Rare Metal Materials and Engineering,2022,51(8):2907~2914.]
TC4钛合金表面激光熔覆WC增强镍基复合涂层的组织及耐磨性
投稿时间:2021-07-07  修订日期:2021-09-11
中文关键词:  激光熔覆  钛合金  微观组织  显微硬度  耐磨性  结合强度
基金项目:国家自然科学(52075465);湖南省杰出青年(2019JJ20015);湖南省科技创新计划资助项目(2020RC4038);湖南省研究生科研创新项目(CX20200644);湖南省教育厅资助科研项目(20B131)
中文摘要:
      为提高TC4钛合金的耐磨性,利用激光熔覆技术在TC4钛合金表面制备Ni60+50%WC和d22粉末打底+(Ni60+50%WC)两种耐磨复合涂层。采用扫描电子显微镜(SEM)、能谱仪(EDS)以及X射线衍射仪(XRD)来表征涂层的微观结构和物相组成;使用HV-1000显微维氏硬度计、HRS-2M型高速往复摩擦磨损试验机和WDW-100D电子万能试验机来分析涂层的性能。结果表明:两种涂层均由W2C、TiC、Ni17W3、Ni3Ti和TixW1-x相组成,两种涂层不仅与基体呈现出优异的冶金结合,而且组织均匀致密,没有裂纹瑕疵;由于涂层中存在着原位合成的硬质相和细晶强化共同作用使得涂层硬度显著提高,约为TC4基体的2.8倍;两种涂层的摩擦系数(COF)和磨损量都远低于TC4钛合金基体,耐磨性能比基体提高了近17倍;Ni60+50%WC复合涂层和d22粉末打底+(Ni60+50%WC)复合涂层的剪切结合强度分别为188.19 MPa和49.11 MPa。结论:两种涂层均能显著改善TC4钛合金基体表面的硬度和耐磨性能,其中Ni60+50%WC复合涂层在硬度、耐磨性和结合强度等方面表现得更出色。
Microstructure and wear resistance of laser cladding WC reinforced Ni based composite coating on TC4 titanium alloy
英文关键词:Laser cladding  Titanium alloy  Microstructure  Microhardness  Wear resistance  Bonding strength
英文摘要:
      In order to improve the wear resistance of TC4 titanium alloy, two wear-resistant composite coatings of Ni60+50%WC and d22 powder based +(Ni60+50%WC) were prepared on the surface of TC4 titanium alloy by laser cladding. Microstructure and phase composition of the coating were characterized by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD). The properties of the coating were analyzed by HV-1000 micro Vickers hardness tester, HRS-2M high-speed reciprocating friction and wear tester and WDW-100D electronic universal testing machine. The results show that the two coatings are composed of W2C, TiC, Ni17W3, Ni3Ti and TixW1-xphases; The two coatings not only exhibit excellent metallurgical bonding with the substrate, but also have uniform and dense microstructure without cracks; Due to the presence of the in-situ synthesized hard phase and fine-grain strengthening make the hardness of the coating significantly increased, which is about 2.8 times that of the TC4 substrate; The friction coefficient (COF) and wear amount of the two coatings are much lower than that of TC4 titanium alloy substrate, and the wear resistance of the two coatings is nearly 17 times higher than that of the substrate; The shear bonding strength of Ni60+50%WC composite coating and d22 powder based + (Ni60+50%WC) composite coating are 188.19 MPa and 49.11 MPa respectively. Conclusion: Both coatings can significantly improve the hardness and wear resistance of the TC4 titanium alloy substrate surface, and Ni60 + 50% WC composite coating performs better in hardness, wear resistance and bonding strength.
作者单位E-mail
刘金刚 湘潭大学 机械工程学院 liujingang@xtu.edu.cn 
杨建花 湘潭大学 机械工程学院  
王高升 湘潭大学 机械工程学院 wgs@hnie.edu.cn 
李毅 湘潭大学 机械工程学院  
郑剑云 湘潭大学 机械工程学院  
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