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。
Nickle-based composite alloy powders were deposited on the surface of Q235 steel by plasma-arc surfacing. Optimal proportions of elements intensifying the composite powders were ascertained by orthogonal design of three factors and three levels and orthogonal polynomial regression analysis, which were 10% Cr, 4% Mn, and 7% W respectively. Phase and structure of deposited materials were characterized using optical microscope and X-ray diffraction. Hardness tests and wear resistance tests were utilized to understand the performance of the deposited layers. The result showed that the microstructure 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 hardness of the surface increased evidently.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2005年第1期37-40,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目 (50075086
50235030 )
国防科技"十五"预先研究项目(413270103)
关键词
等离子孤堆焊
镍基复合粉末
显微组织
硬度
耐磨性
Composite materials
Hardness testing
Microstructure
Optical microscopy
Plasma welding
Regression analysis
Steel
Wear resistance
X ray diffraction analysis
