Page 48 - 机械工程材料2025年第三期

李新平，等：电站循环流化床锅炉水冷壁用HDS65焊丝防磨堆焊层的组织与性能

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Microstructure and Properties of HDS65 Wire Surfaced Wear-Resistant Layer for
Water Wall of Circulating Fluidized Bed Boiler in Power Plant

LI Xinping , GAO Yuan 2
1, 2
(1. College of Engineering and Technology, Nanchang Vocational University, Nanchang 330500, China;
2. Jiangxi Hengda Hi-Tech Co., Ltd., Nanchang 330096, China)
Abstract: A kind of iron-based flux-cored wire（HDS65 welding wire）for wear-resistant surfacing layer of
water wall of circulating fluidized bed boiler in a power plant was developed. The single-layer multi-pass surfacing
welding test was carried out on 20G steel substrate by CO 2 shielded arc welding, and the weldability of the welding
wire and the forming quality, microstructure and high temperature friction and wear behavior of the surfacing layer were
studied. The results show that the weldability of HDS65 welding wire was good, and the weld bead was formed well.
There were no pores and cracks inside and outside the surfacing layer. The microstructure of surfacing layer was mainly
composed of lat martensite, solid solution based on intermetallic compound FeCr and discontinuously distributed fine
carbides. The hardness of the surfacing layer was high, in the range of 630‒690 HV. Compared with that of YD490 wire
surfacing layer, the erosion wear amount of HDS65 wire surfacing layer was lower, the degradation rate was slower,
and the erosion wear resistance was better at 350 ℃ and 600 ℃. With the increase of temperature, the erosion wear
amount of HDS65 wire surfacing layer increased, indicating that the erosion wear resistance became worse; the friction
factor decreased, reaching 0.2‒0.3 at 600 ℃, which was much lower than that of 20G steel substrate; the wear volume
3
increased, which was 0.628 mm at 600 ℃, only about 1/2 of that of 20G steel substrate.
Key words: circulating fluidized bed boiler; CO 2 shielded arc welding; flux cored wire; microstructure; friction
and wear property

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