机械锤击对TC4合金表面晶粒尺寸、硬度及耐腐蚀性的影响  

Effects of Mechanical Punching on Surface Grain Size, Hardness and Corrosion Resistance of TC4 Alloy

作　　者：王博博 涂福泉[1] 许仁波[1] 蒋拓 WANG Bobo;TU Fuquan;XU Yunbi;JIANG Tuo(Key Laboratory of Metallurgical Equipment and Control Technology,Ministry of Education,School of Mechanical Automation,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学机械自动化学院冶金装备及其控制省部共建教育部重点实验室,湖北武汉430081

出　　处：《热加工工艺》2021年第10期81-85,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51701145)。

摘　　要：为改善TC4合金的表面性能,使其在医疗领域得到更好应用,对材料表面进行机械锤击处理。通过X射线衍射仪、显微硬度仪、电化学工作站以及蔡司显微镜表征机械锤击引起的TC4合金的表面晶粒尺寸、表面硬度和耐腐蚀性能的变化。结果表明:经机械锤击处理后,材料的表面晶粒尺寸最小减小到18.35 nm,材料的表层硬度由初始的315.7 HV最大提升到416.67HV,提升了31.98%,材料的耐腐性性能也得到较好提升。锤击45min时,材料的腐蚀电位跟原始试样相比正向移动了138.65 mV,腐蚀电流密度降低了174.44 nA/cm2。通过机械锤击工艺可使TC4合金的表面晶粒细化,材料的硬度和耐腐蚀性得到改善。In order to improve the surface properties of TC4 alloy, making it better apply in the medical field, the surface of the material was mechanically punched. The changes in the surface grain size, surface hardness and corrosion resistance of the TC4 alloy was characterized by X-ray diffractometer, microhardness tester, electrochemical workstation and Zeiss microscope. The results show that after mechanical punching, the surface grain size of the material reduces to 18.35 nm, and the surface hardness of the material increases from the initial 315.7 HV to 416.67 HV, which is increased by 31.98%. The corrosion resistance of the material is also better. When the hammer is punched for 45 min, the corrosion potential of the material is positively moved by 138.65 mV compared with that of the original sample, and the corrosion current density reduces by 174.44 nA/cm2. The surface grain refinement of TC4 alloy improves by mechanical punching, and the hardness and corrosion resistance of the material improves.

关 键 词：机械锤击 晶粒尺寸 硬度 耐腐蚀性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]