Microstructure and Wear Resistance of FeCrBSi Plasma-Sprayed Coating Remelted by Gas Tungsten Arc Welding Process

被引：12

作者：

Dong Tianshun ^{[1
]}

Zheng Xiaodong ^{[1
,2
]}

Li Yalong ^{[1
,2
]}

Li Guolu ^{[1
]}

Zhou Xiukai ^{[1
]}

Wang Haidou ^{[2
]}

机构：

[1] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China

[2] Acad Armored Forces Engn, Natl Key Lab Remfg, Beijing 100072, Peoples R China

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2018年 / 27卷 / 08期

基金：

中国国家自然科学基金;

关键词：

FeCrBSi; GTA remelting; microstructure; plasma spray; wear resistance; CORROSION-RESISTANCE; LASER;

D O I：

10.1007/s11665-018-3475-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Herein, an FeCrBSi coating was fabricated via plasma spray on AISI1045 steel, and subsequently, a gas tungsten arc welding (GTA) process was employed to remelt the coating. The microstructure, microhardness, fracture toughness and surface roughness of the coating before and after remelting were investigated, as well as the wear resistance was tested by a UMT-3-type sliding wear apparatus. The results showed that, upon remelting, most defects in the as-sprayed coating were effectively eliminated, the surface roughness decreased by 43%, and the coating-substrate interface bonding changed from mechanical to metallurgical. The phase composition of the as-sprayed coating was primarily alpha-Fe and a small amount of hard Fe3B phase, while the remelted coating consisted of alpha-Fe and (Fe,Cr)(23)C-6 and a small quantity of CrB. In addition, remelting the coating was found to induce a 287.6% increase in the fracture toughness, a 33.4% increase in the average microhardness, and a 47.5% decrease in the wear volume, while the failure mechanism changed from abrasive wear to fatigue wear upon remelting. Therefore, GTA remelting of plasma-sprayed coating was found to be a feasible method to obtain a coating with good wear resistance.

引用

页码：4069 / 4076

页数：8

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