摘要
为了探究深冷处理对TC4钛合显微组织,力学性能及摩擦磨损性能的影响,采用显微硬度计测定钛合金的表面硬度,光学显微镜观测钛合金经深冷处理后微观组织的变化,万能拉伸试验台测定其拉伸性能,利用摩擦磨损仪研究了深冷处理前后钛合金的磨损性能及利用SEM、EDS分析磨痕的微观形貌和化学成分。结果表明:深冷处理可以提高TC4钛合金的显微硬度,深冷处理时间为11 h时其显微硬度可以达到最大值361 HV1,比初始时提高了3.7%。经过深冷处理后不规则的晶体边角破碎,晶体内的组织均匀化提高;深冷处理可以显著提高材料的抗拉强度,屈服极限及弹性模量,提高材料的力学性能;深冷处理后摩擦系数增加,磨损加剧。
In order to investigate the effect of the cryogenic treatment on the microstructure,mechanical properties and friction and wear properties of TC4 titanium alloy.The surface hardness of TC4 titanium alloy was measured with microhardness tester,the changes of microstructure of TC4 titanium alloy after cryogenic treatment were observed with optical microscope,and its tensile properties were measured with universal tensile test bench.The wear properties of TC4 titanium alloy before and after cryogenic treatment were studied with friction and wear tester,and the micro-morphology and chemistry of wear marks were analyzed with SEM and EDS.The results showed that the microhardness of TC4 titanium alloy was improved via cryogenic treatment.The maximum microhardness of TC4 titanium alloy was 361 HV1 at a cryogenic treatment time of 11 h,which is 3.7%higher than that at the initial time.After cryogenic treatment,the homogenization of the crystal structure is improved and the internal stress of the material is effectively released.The cryogenic treatment can significantly improve the tensile strength,yield limit and modulus of elasticity,and improve the mechanical properties of materials.After cryogenic treatment,the friction coefficient increases and the wear becomes worse.
作者
雷达
李永刚
李文辉
李秀红
杨胜强
王瑶
LEI Da;LI Yonggang;LI Wenhui;LI Xiuhong;YANG Shengqiang;WANG Yao(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Province Key Laboratory of Precisely Machining,Taiyuan 030024,China;Taiyuan Heavy Machinery Group Co.,Ltd.,Taiyuan 030024,China)
出处
《机械科学与技术》
CSCD
北大核心
2021年第4期566-571,共6页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51705352,51875389)
中国博士后科学基金项目(2018M641682)
山西省高等学校科技创新项目(2019L0139)。
关键词
钛合金
深冷处理
摩擦磨损
力学性能
titanium alloy
cryogenic treatment
friction and wear
mechanical property
