Effect of vacuum heat treatment on microstructure and corrosion behavior of HVOF sprayed AICoCrFeNiCu high entropy alloy  

作　　者：Yong-kuan Zhou l Jia-jie Kang Guo Jin Xiu-fang Cui Jie Zhang Guo-zheng Ma Zhi-qiang Fu Li-na Zhu Ding-shun She Yu-yun Yang 

机构地区：[1]School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China [2]School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,Jiangsu,China [3]Zhengzhou Institute,China University of Geosciences(Beijing),Zhengzhou 451283,Henan,China [4]College of Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang,China [5]Department of Mechanical Engineering,Imperial College London,London SW72AZ,UK [6]National Key Lab for Remanufacturing,Academy of Armored Forces Engineering,Beijing 100072,China

出　　处：《Journal of Iron and Steel Research International》2023年第8期1550-1561,共12页

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFB3706600);the National Natural Science Foundation of China(Grant Nos.52175196 and 52275218);the Fundamental Research Funds for Central Universities(Grant No.265QZ2021008).

摘　　要：To improve the corrosion resistance of coalbed methane drilling equipment,an AICoCrFeNiCu high entropy alloy coating was prepared on the AISI 4135(35CrMo)steel substrate by high velocity oxygen fuel(HVOF)technology,and the coating was subjected to vacuum heat treatment(VHT)at different temperatures(500,700,900 and 1100℃).The corrosion test of the substrate and the coatings after VHT in coalbed methane drilling fluid was carried out.The results show that the HVOF sprayed AICoCrFeNiCu high entropy alloy(HEA)coating has a good bonding with the substrate,and the porosity of the coating is about 2.4%.There is partial segregation in the coating,and the coating mainly consists of body-centered cubic phase.The coating has good thermal stability,and the phase structure and microstructure of the coatings have changed after VHT at different temperatures.Compared with the substrate,the as-sprayed coating has better uniform corrosion resistance,and the corrosion resistance of the coating after VHT is further improved.After VHT at 500℃,the HVOF-sprayed AICoCrFeNiCu HEA coating has the best corrosion resistance.

关 键 词：High velocity oxygen fuel AICoCrFeNiCu high entropy alloy coating Vacuum heat treatment MICROSTRUCTURE Corrosion 

分 类 号：TG156[金属学及工艺—热处理]