Comparison of microstructure and oxidation behavior of NiCoCrAlYSi laser cladding coating before and after high-current pulsed electron beam modification

被引：28
作者：
Cai, Jie [1 ,2 ]
Yao, Yiming [1 ,2 ]
Gao, Chengzuan [1 ,2 ]
Lyu, Peng [3 ]
Meng, Xiankai [1 ,2 ]
Guan, Qingfeng [3 ]
Li, Yuxin [4 ]
Han, Zhiyong [5 ]
机构：
[1] Jiangsu Univ, Inst Adv Mfg & Modern Equipment Technol, Zhenjiang 212013, Jiangsu, Peoples R China
[2] Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China
[3] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China
[4] North Univ China, Sch Mat Sci & Engn, Taiyuan 030051, Peoples R China
[5] Civil Aviat Univ China, Coll Sci, Tianjin 300300, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 881卷
基金：
中国国家自然科学基金;
关键词：
NiCoCrAlYSi coating; Laser cladding (LC); High-current pulsed electron beam (HCPEB); Microstructural; Oxidation behavior; HOT CORROSION BEHAVIOR; MCRALY COATINGS; LOW-ENERGY; SURFACE MICROSTRUCTURE; ISOTHERMAL OXIDATION; GROWTH; RESISTANCE; EVOLUTION;
D O I：
10.1016/j.jallcom.2021.160651
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this study, NiCoCrAlYSi coatings prepared via laser cladding were modified using a high-current pulsed electron beam (HCPEB) technique. The microstructural modifications and the effects that the HCPEB treatment had on the high-temperature oxidation resistance were investigated. Microstructural observations reveal that the cladding coating surface, which was initially porous and composed of dendritic segregations, was totally changed after HCPEB irradiation; specifically, the microstructure became rather dense, and the composition became uniform. The grain refinement and high density of dislocations were obtained in the remelted layer. After oxidation for 100 h, the original coating showed relatively poor oxidation resistance, presented as severe internal oxidation. After HCPEB irradiation, the modified coating samples promoted the rapid formation of a stable, continuous, and slow-growing alpha-Al2O3 scale, which effectively prolonged the high-temperature life of the cladding coating. (c) 2021 Elsevier B.V. All rights reserved.
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页数：13
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