摘要
选取TC4合金进行热浸镀铝及高温退火处理，采用SEM、XRD、EDS等微观分析手段表征了镀层形貌、物相和成分，采用销-盘式高速磨损机研究了TC4合金镀层和基体在不同速度和载荷下的干滑动磨损行为，并探讨其磨损机制。结果表明：扩散层以TiAl3为主相，与基体结合良好，表面平整均匀。在同一载荷下，速度0.5～4 m/s时， TC4合金镀层的磨损率都要低于基体，耐磨性好。镀层和基体的磨损率均呈现出较为相似的变化趋势。0.5～0.75 m/s时，磨损率先降低，之后磨损率迅速上升，2.68 m/s时达到顶值，2.68～4 m/s时磨损率再次降低。0.75 m/s时主要为粘着磨损、磨粒磨损；2.68 m/s时为剥层磨损；4 m/s时以氧化轻微磨损为主。
The aluminized TCA alloy was prepared by hot-dip aluminizing and subsequently high-tempera- ture annealing treatment. The morphology, phase and compositions of aluminized coating were character- ized with SEM,XRD and EDS. Dry sliding wear behaviors at different velocities and loadings were con- ducted for the aluminized and uncoated TC4 alloy on a pin-on-disc wear tester, and the wear mechanism was also explored. The results show that the coating is mainly composed of TiA13 combined well to the substrate with a smooth surface. Compared with uncoated TC4 alloy, the aluminized coating has a more excel- lent wear resistance at sliding velocities of 0.5 - 4 m/s under the same loads. The aluminized and uncoat- ed TC4 alloy present a similar variation of wear rate as a function of velocity. At 0.5-0.75 m/s, the wear rate first decrease and then increase rapidly, reaching the top value at 2.68 m/s. Furthermore, the wear rate decreases again from 2.68 to 4 m/s. The main wear mechanism at 0.75 m/s is adhesive wear and ab- rasive wear,while it is delamination wear at 2.68 rn/s and slightly oxidative wear at 4 m/s.
作者
陈伟
王浩浩
郭孟蕾
姜伟
王树奇
Chen Wei, Wang Haohao, Guo Menglei, Jiang Wei, Wang Shuqi(School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, Chin)
出处
《钢铁钒钛》
CAS
北大核心
2018年第1期46-50,共5页
Iron Steel Vanadium Titanium
基金
国家自然科学基金(51071078)
江苏省普通高校研究生科研创新计划项目(KYCX17-1770)
关键词
TC4合金
热浸镀铝
磨损行为
磨损机制
TC4 alloy, hot-dipped aluminizing, wear behaviors, wear mechanisms
