Microstructure and Wear Resistance of Cr-Mo-Ni and Cr-Mo-W-VFlux Cored Wire Surfacing Layers
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摘要: 采用气体保护焊对718钢板进行堆焊，对比研究了Cr-Mo-Ni系和Cr-Mo-W-V系药芯焊丝堆焊层的组织、硬度与耐磨性能。结果表明：2种药芯焊丝堆焊层均与母材熔合良好，无焊接缺陷；Cr-Mo-Ni系药芯焊丝堆焊层的显微组织由马氏体和少量残余奥氏体组成，Cr-Mo-W-V系药芯焊丝堆焊层的显微组织由细小马氏体、较多铁素体、极少残余奥氏体组成，铁素体内有碳化物析出；Cr-Mo-Ni系药芯焊丝堆焊层的平均硬度为571 HV，高于Cr-Mo-W-V系药芯焊丝堆焊层的（519 HV）；2种药芯焊丝堆焊层的耐磨性能均优于母材的，且Cr-Mo-W-V系药芯焊丝堆焊层的耐磨性能优于Cr-Mo-Ni系药芯焊丝堆焊层的，这与Cr-Mo-W-V系药芯焊丝中的钨、钒元素可促进堆焊层中晶粒的细化与耐磨碳化物的形成有关。Abstract: 718 steel plate was welded by gas shielded surfacing, and the microstructure, hardness, and wear resistance of Cr-Mo-Ni and Cr-Mo-W-V flux cored wire surfacing layers were studied. The results show that the two flux cored wire surfacing layers without weld defects were well fused with the base metal. The microstructure of Cr-Mo-Ni flux cored wire surfacing layer was mainly composed of martensite and a small amount of retained austenite. The microstructure of Cr-Mo-W-V flux cored wire surfacing layer mainly consisted of fine martensite, much ferrite and very little retained austenite, and carbides precipitated in ferrite phase. The average hardness of the Cr-Mo-Ni flux cored wire surfacing layer was 571 HV, which was higher than that of Cr-Mo-W-V flux cored wire surfacing layer (519 HV). The wear resistance of the two flux cored wire surfacing layers was better that of the base metal, and the wear resistance of Cr-Mo-W-V flux cored wire surfacing layer was the best, because the elements of tungsten and vanadium in the microstructure of Cr-Mo-W-V flux cored wire surfacing layer improved the grain refinement and wear resistance carbide precipitation.
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Keywords:
- surfacing layer /
- flux cored wire /
- wear resistance /
- microstructure
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