激光熔覆高铝铬铁硼碳涂层的微观结构与磨损行为研究

Investigation on the Microstructure and Wear Behavior of Laser-Cladded High Aluminum and Chromium Fe-B-C Coating.

作者信息

Li Jingjing, Ju Jiang, Chang Weiwei, Yang Chao, Wang Jun

机构信息

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China.

出版信息

Materials (Basel). 2020 May 27;13(11):2443. doi: 10.3390/ma13112443.

DOI:10.3390/ma13112443

PMID:32471073

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7321156/

Abstract

In this study, a high aluminum and chromium Fe-B-C coating was prepared using laser cladding on 2Cr13 steel substrate. The microstructure, microhardness, and wear resistance of the high aluminum and chromium Fe-B-C coating were investigated. The results show that this dense coating possesses good metallurgical bond with the substrate. The microstructure is mainly composed of α-(Fe, Cr, Al) lath martensite, orthorhombic MB boride, orthogonal MC, and orthorhombic MC carbides. The microhardness of the coating can reach 620 HV which is 3.3-times higher than that (190 HV) of the substrate. The coating shows a lower friction coefficient of 0.75 than that of the substrate (1.08). The wear rates of the substrate and the coating are 0.295 mg/min and 0.103 mg/min, respectively, indicating the coating exhibits excellent wear resistance. The wear mechanism transforms severe adhesive wear and abrasive wear of the substrate to slight abrasive wear of the coating. The results can provide technical support to improve the properties of the Fe-based laser cladded coating.

摘要

在本研究中，采用激光熔覆在2Cr13钢基体上制备了一种高铝铬Fe-B-C涂层。研究了高铝铬Fe-B-C涂层的微观结构、显微硬度和耐磨性。结果表明，这种致密涂层与基体具有良好的冶金结合。微观结构主要由α-(Fe, Cr, Al)板条马氏体、正交MB硼化物、正交MC和正交MC碳化物组成。涂层的显微硬度可达620 HV，是基体（190 HV）的3.3倍。涂层的摩擦系数为0.75，低于基体的摩擦系数（1.08）。基体和涂层的磨损率分别为0.295 mg/min和0.103 mg/min，表明涂层具有优异的耐磨性。磨损机制从基体的严重粘着磨损和磨粒磨损转变为涂层的轻微磨粒磨损。研究结果可为改善铁基激光熔覆涂层性能提供技术支持。