等离子堆焊Ni基合金粉末熔覆层性能研究  

Study on Properties of Melt-Coated Layers with Nickel-Based Alloy Powders by Plasma-arc Surfacing Welding

作　　者：宇文利[1] 刘秀丽[1] 李伟华[1] 

机构地区：[1]石家庄职业技术学院建筑工程系,河北石家庄050081

出　　处：《金属热处理》2006年第10期41-43,共3页Heat Treatment of Metals

摘　　要：采用等离子堆焊技术在Q235钢表面分别堆焊N i-W-C合金粉末和N i-Cr-W-Mn系复合粉末熔覆层。利用金相显微镜、扫描电镜、X射线衍射仪(XRD)及磨损试验机对两种镍基合金熔覆层的微观组织及耐磨性进行了研究。结果表明,N i-W-C合金粉末熔覆层显微组织主要为γ-N i,Cr7C3,WC,(N i,Fe)3(B,C)等,N i-Cr-W-Mn系复合粉末熔覆层显微组织主要为γ-N i,γ-(N i,Fe),WC,W2C,Mn31Si12,Cr23C6,Cr7C3,N iB,N i2B等。N i-Cr-W-Mn系复合粉末较N i-W-C合金粉末熔覆层耐磨性提高近10倍。N i-Cr-W-Mn系复合粉末熔覆层通过多元素固溶强化及生成大量金属间化合物提高了熔覆层的硬度及耐磨性。Two kinds of nickel-based alloy powders were deposited on the surface of Q235 steel by plasma-arc surfacing welding. One was Ni-W-C powders,the other was Ni-Cr-W-Mn composite powders. The microstructures and wear resistance of two kinds of melt-coated layers were characterized by optical microscope, scanning electron microscope, X-ray diffractometer and wear tester, and the wear mechanism was also discussed. The results show that the microstructure of coated layers of Ni-W-C and Ni-Cr-W-Mn composite powders mainly consist of γ-Ni, Cr7 C3, WC, （ Ni, Fe） 3 （ B, C ） etc. and γ- （ Ni, Fe） , γ-Ni, WC, W2 C, Mn3 1 Sil 2, Cr23 C6, Cr7 C3, NiB, Ni2 B etc. respectively. The wear resistance of the surface using Ni-Cr-W-Mn composite powders were 10 times higher than that of Ni-W-C powders. The melt-coated layer with Ni-Cr-W-Mn composite powders is strengthened by solution strengthening of many kinds of alloy elements and intermetallics.

关 键 词：等离子堆焊 显微组织 硬度 耐磨性 

分 类 号：TG174.444[金属学及工艺—金属表面处理]