Ti对车用304L不锈钢熔覆层组织及耐磨性的影响
Effect of Ti on microstructure and wear resistance of 304L laser cladding coating for vehicle
张连松 1许国坚 2薛元慧3
作者信息
- 1. 内蒙古交通职业技术学院,赤峰内蒙古 024005
- 2. 南华大学机械工程学院,衡阳湖南 421001
- 3. 上汽大众汽车有限公司,上海 201805
- 折叠
摘要
为提升车用304L不锈钢的耐磨性,采用激光熔覆技术在304不锈钢表面制备304L涂层和304L-5％Ti涂层.研究了 Ti元素对304L不锈钢涂层相组成、形貌、元素分布及磨损行为的影响.结果表明:304L-5％Ti涂层的相组成为α-Fe及γ-Fe.并在涂层中生成了少量TiC颗粒.304L涂层和304L-5％Ti涂层的表面显微硬度分别为(187±7.8)HV和(270±8.9)HV,Ti元素的引入使涂层的显微硬度提升45％.304L涂层和304L-5％Ti涂层的平均摩擦因数分别为0.756和0.649,比磨损率分别为8.03×10-5 mm3/N·m和5.41×10-5 mm3/N·m,304L-5％Ti涂层的磨损率降低了 35％.304L-5％Ti涂层的磨损机制为粘着磨损和磨粒磨损.
Abstract
In order to improve the wear resistance of 304L stainless steel for vehicles,304L coating and 304L-5％Ti coating were prepared on the surface of 304 stainless steel by laser cladding.The effects of Ti on the phase com-position,morphology,elemental distribution and wear behavior of 304L stainless steel coating were studied.The re-sults show that the phase composition of 304L-5％Ti coating is α-Fe and γ-Fe.A small amount of TiC particles are generated in the coating.The surface microhardness of 304L coating and 304L-5％Ti coating are(187±7.8)HV and(270±8.9)HV,respectively,and the introduction of Ti element increased the microhardness of the coating by 45％.The average friction coefficients of 304L coating and 304L-5％Ti coating are 0.756 and 0.649,respectively,and the specific wear rates are 8.03×10-5 mm3/N·m and 5.41×10-5 mm3/N.m,respectively.The wear rate of 304L-5％Ti coating is reduced by 35％.The wear mechanism of 304L-5％Ti coating is adhesion wear and abrasive wear.
关键词
激光熔覆/304L涂层/Ti/耐磨性/显微硬度Key words
laser cladding/304L coating/Ti/wear resistance/microhardness引用本文复制引用
基金项目
国家自然科学基金资助项目(51975270)
出版年
2024
NETL
NSTL
万方数据