NbC对激光熔覆316L不锈钢组织及性能的影响
Effect of NbC on Microstructure and Properties of Laser-Cladding 316L Stainless Steel
王天煜 1张岳 2许桐舟3
作者信息
- 1. 上海电子信息职业技术学院机械与能源工程学院 上海 201411
- 2. 山东大学电气工程学院,山东济南 250100
- 3. 沈阳工业大学材料科学与工程学院,辽宁沈阳 110870
- 折叠
摘要
为提高316L激光熔覆层的硬度及耐磨性,采用激光熔覆技术在车用304不锈钢表面制备10％(质量分数)NbC/316L不锈钢复合涂层.分别研究复合涂层的组织形貌、相组成、元素分布、硬度及磨损行为.结果表明,复合涂层表面无裂纹、气孔等缺陷,组织均匀致密.涂层由γ-Fe和NbC组成,其中NbC均匀弥散地分布在涂层中.结合涂层微观组织及元素分布,NbC在涂层中起到了细晶强化和第二相强化作用,复合涂层的显微硬度约为354 HV,显著高于316L涂层的显微硬度(233 HV).由于显微硬度的提高,复合涂层的摩擦系数和磨损率均有降低,复合涂层的平均摩擦系数约为0.387,磨损率为1.41×10-5 N·m,约为316L涂层的50％.添加NbC可显著提升316L涂层的硬度和耐磨性.
Abstract
To enhance the microhardness and wear resistance of 316L coatings,NbC/316L stainless steel composite coatings were synthesized on 304 stainless steel substrates using laser cladding.The microstructure,phase composition,element distri-bution,hardness and wear behavior of the composite coatings were studied,respectively.The results showed that the surface of the composite coating had no defects such as cracks and pores,and the structure were uniform and dense.The coating con-sisted of γ-Fe and NbC,where NbC were uniformly and diffusely distributed throughout the coating.Combined with the micro-structure and element distribution of the coating,NbC played a fine crystal strengthening and second phase strengthening in the coating,and the microhardness of the composite coating were about 354 HV,which was significantly higher than the micro-hardness of the 316L coating(233 HV).Due to the improvement of microhardness,the friction coefficient and wear rate of the composite coating have been reduced,and the average friction coefficient of the composite coating was about 0.387,and the wear rate was 1.41×10-5(N·m),which is about 0.5 times that of the 316L coating.The addition of NbC can significantly improve the hardness and wear resistance of the 316L coating.
关键词
激光熔覆/316L不锈钢/硬度/耐磨性/碳化铌Key words
laser cladding/316L stainless steel/hardness/abrasion resistance/NbC引用本文复制引用
出版年
2024
NETL
NSTL
万方数据