等离子弧堆焊镍基复合粉末涂层材料

Study on nickel-based composite powders by plasma-arc surfacing

摘要: 采用等离子弧堆焊技术,在Q235钢表面堆焊镍基复合粉末。该复合粉末经三水平三因子正交设计及正交多项式回归分析,确定在镍基基础粉末中添加的强化元素最佳配比为Cr10%、Mn4%、W 7%。利用金相显微镜、X射线衍射仪(XRD)对堆焊层的相及组织进行了研究,通过硬度试验和磨损试验测试了堆焊层表面及横截面的硬度和表面耐磨性能。结果表明,复合粉末堆焊层显微组织主要为γ-(Ni,Fe)、γ-Ni、WC、W₂C、Mn₃₁Si₁₂、Cr₂₃C₆、Cr₇C₃、Cr、NiB、Ni₂B等,其硬度及耐磨性较基体有显著提高。

Abstract: Niekle-based composite alloy powders were depositedon the Surface of Q235 steel by plasma-arc surfacing.Optimal pmpor-tions of elements intensifying the composite powders were ascertained byorthogonal design of three factors and three levels and orthogonal polyno-mial regression analysis,which were 10% Cr,4% Mn,and 7% W respec-tively.Phase and structure of deposited materials were characterized using optical microscope and X-my diffraction.Hardness tests and wear resi8t-ance tests were utilized to understand the performance of the deposited layers.The result showed that the miemstrueture of deposited layers of composite powders mainly consisted of γ-(Ni,Fe),γ-Ni,WC,W₂C,Mn₃₁Si₁₂,Cr₂₃C₆,Cr₇C₃,Cr,NiB,Ni₂B etc.Wear resistance and hard-ness of the surface increased evidently.