Page 88 - 机械工程材料2025年第三期

张 宇，等：焊接电流对Ni60/Cr3C2等离子堆焊层组织及性能的影响

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Effect of Welding Current on Microstructure and Properties of Ni60/Cr C
3
2
Plasma Surfacing Layer

ZHANG Yu , TANG Biao , MA Teng , BI Lige , ZHOU Heng 2
1
1
1
1
(1. School of Materials Science and Engineering, Jiamusi University, Jiamusi 154007, China; 2. School of Metallurgical and
Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China)
Abstract: With Ni60 alloy power+20wt% Cr 3 C 2 powder as surfacing powder, a single-pass Ni60/Cr 3 C 2
surfacing layer was prepared on the surface of Q235 low carbon steel by plasma surfacing technology. The effects of
welding current (110‒140 A) on the macromorphology, microstructure, hardness and wear resistance of the surfacing
layer were studied. The results show that the Ni60/Cr 3 C 2 surfacing layer exhibited a good metallurgical bond with the
substrate. When the welding current increased to 130 A, the surface of the surfacing layer became smooth and flat, and
the forming quality became good; when the welding current was too high (140 A), the surface oxidation and burning
appeared, and the forming quality deteriorated. With the increase of welding current, the melting height, melting depth,
melting width and dilution rate of the surfacing layer all increased. The surfacing layer under 110 A welding current was
composed of γ-Ni(Fe), Cr 7 C 3 and CrB phases. With the increase of welding current, the types of chromium compounds
increased. The surfacing layers under 130,140 A welding currents were composed of γ-Ni(Fe), Cr 7 C 3 , CrB, Cr 23 C 6
and Cr 3 C 2 phases. With the increase of welding current, the structure of the surfacing layer was refined first and then
coarsened, the number of carbides and the hardness of the surfacing layer first increased and then decreased, and the wear
mass loss first decreased and then increased. When the welding current was 130 A, the surfacing layer had good forming
quality without obvious defects, and had the finest structure, the largest number of carbides, the flower-like structure
centered on chromium carbide, the highest hardness, the least wear mass loss , and the lightest abrasive wear degree.
Key words: plasma surfacing; Ni60/Cr 3 C 2 surfacing layer; welding current; hardness; wear resistance
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