Abstract: Ceramic-reinforced high entropy alloy coating was prepared on the surface of stainless steel used in 0Cr13Ni5Mo turbines by laser cladding technology. Using microhardness and dilution rate as indexes, an orthogonal experiment with three factors and three levels were performed, and the optimal single-channel cladding technology was determined as follows: laser power 2 500 W, scanning speed 200 mm/min, powder feeding speed 9.5 g/min. AlCoCrFeNi-1wt% Ni-coated Al2O3 composite coating was prepared with the optimum process parameters and 50% bonding rate. The microstructure, phase and microhardness of the composite coating were analyzed and characterized by X-ray diffractometer, scanning electron microscope and microhardness tester. The influence of heat treatment at 850 ℃ for 2 h on the erosion resistance of the composite coating was studied by an injection-flow erosion test device. The results show that the microstructure of the composite coating does not undergo phase transformation after heat treatment, and the composite coating is still composed of single-phase solid solution with body-centered cubic structure (BCC), but the grain size is significantly refined. The microhardness of AlCoCrFeNi-1wt% Ni-coated Al2O3 composite coating increased from 504HV0.3 before heat treatment to 545HV0.3. Before and after heat treatment, the mass loss of the coating is 63.5 mg and 50.5 mg when the coating is eroded for 30 min. The mass loss was 178.5 mg and 146.9 mg after 120 min of erosion. The composite coating showed better erosion resistance after heat treatment. After annealing treatment, the surface morphology of the coating showed a ‘furrow’ dominated by the micro-cutting effect of liquid and solid two-phase flow at low erosion angle. With the increase of erosion angle, the coating surface gradually changes from a single ‘furrow’ morphology to a composite morphology of ‘furrow’ ‘lip piece’ and ‘pit’ under the synergic effect of micro-cutting and impact crushing.
通讯作者:
* 张超,扬州大学机械工程学院教授,三级教授,博士研究生导师。2009年获得西安交通大学、法国贝尔福蒙贝利亚技术大学联合培养博士。2020年获中国材料研究学会科学技术奖二等奖(排名第1),2021年获江苏省杰出青年基金。主要从事以热喷涂合金涂层工艺优化和超低浓度和室温下工作工作的半导体气敏方向研究。在Sensors and Actuators B、Journal of Alloys and Compounds、Tribology International等期刊上发表SCI论文120余篇,被引超6 000次。zhangc@yzu.edu.cn
作者简介: 魏新龙,扬州大学机械工程学院副教授、硕士研究生导师。2010年南京工业大学本科毕业,2010—2016年南京工业大学博士毕业后于扬州大学机械工程学院任教。主要从事热喷涂/激光熔覆防腐耐磨涂层技术和特种表面冲击强化技术研究。在Applied Surface Science、Journal of Alloys and Compounds、Engineering Failure Analysis等期刊上发表论文10余篇。
引用本文:
魏新龙, 戴凡昌, 付二广, 班傲林, 张超. 单道激光熔覆高熵合金工艺优化及复合涂层耐冲蚀性能研究[J]. 材料导报, 2024, 38(14): 23020130-7.
WEI Xinlong, DAI Fanchang, FU Erguang, BAN Aolin, ZHANG Chao. Process Optimization of Single Pass Laser Cladding High Entropy Alloy and Study on Erosion Resistance of Its Composite Coatings. Materials Reports, 2024, 38(14): 23020130-7.
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