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采用钨电极熔化、离心浇注工艺制备4种Ti-Cr合金,研究Ti-Cr合金的显微组织和力学性能,并采用CJS111A型球-盘式摩擦磨损试验机评价其干摩擦磨损性能,研究合金元素Cr对Ti-Cr合金耐磨性的影响,利用扫描电子显微镜(SEM)观察Ti-Cr合金的磨损表面,采用力学性能显微探针观察测试Ti-Cr合金的磨痕轮廓和最大磨痕深度,分析Ti-Cr合金的磨损机理。结果表明:Cr含量对Ti-Cr合金的显微组织形貌影响较大,Ti-Cr合金维氏硬度随着Cr含量的增加而降低;Ti-10Cr合金的最大压缩强度为2024 MPa,Ti-15Cr合金的最小压缩强度为1650 MPa;4种Ti-Cr合金中,Ti-5Cr合金的稳态摩擦因数最小,磨损表面较光滑,Ti-15Cr和Ti-20Cr合金的磨损表面出现了犁沟,磨屑粘连在一起。随着Cr含量的增加,Ti-Cr合金的最大磨痕深度减小,抗磨性增强,Ti-Cr合金的磨损机制:以磨粒磨损为主,是黏着磨损和磨粒磨损共同作用。
Four kinds of Ti-Cr alloys were prepared by melting and centrifugal casting process of tungsten electrode. The microstructure and mechanical properties of Ti-Cr alloy were studied. The dry friction and wear properties of Ti-Cr alloy were evaluated by CJS111A ball-and-disk friction and wear tester. The effect of element Cr on the wear resistance of Ti-Cr alloy was studied. The wear surface of Ti-Cr alloy was observed by scanning electron microscope (SEM), and the wear profile and the maximum wear mark of Ti-Cr alloy Depth, analysis of the wear mechanism of Ti-Cr alloy. The results show that the content of Cr has a great effect on the microstructure of Ti-Cr alloy. The Vickers hardness of Ti-Cr alloy decreases with the increase of Cr content. The maximum compressive strength of Ti-10Cr alloy is 2024 MPa, The minimum compressive strength of 15Cr alloy is 1650 MPa. Among the four Ti-Cr alloys, the steady-state friction coefficient of Ti-5Cr alloy is the smallest and the wear surface is smooth. Furrows appear on the wear surface of Ti-15Cr and Ti-20Cr alloy, Debris sticks together. With the increase of Cr content, the maximum depth of wear scar of Ti-Cr alloy is reduced and the wear resistance is enhanced. The wear mechanism of Ti-Cr alloy is mainly abrasive wear, which is a combination of adhesive wear and abrasive wear.