Si的添加量对钨极氩弧堆焊铁基高碳高铬合金层组织结构及耐磨性的影响

Effect of Silicon Content on Microstructure and Wear Resistance of Argon-Tungsten-Arc Welded Surfacing of Iron-Based High-Carbon-High-Chromium Alloy

为了改善铁基高碳高铬合金堆焊层的性能,在其堆焊合金粉中添加Si对Q235钢进行钨极氩弧堆焊,探讨Si含量对堆焊层组织结构、硬度和耐磨性的影响。结果表明:添加不同含量Si堆焊后堆焊层与母材的结合均为冶金结合,微观组织基本相似,均由网状碳化物(Cr7C3,Cr23C6)和残余奥氏体的共晶组织以及胞状残余奥氏体组织构成;Si含量从0增加到9.0%,网状组织的数量、胞状组织的显微硬度呈增加趋势,堆焊层的宏观硬度由55HRC增加到60 HRC,磨损失重由16.8 mg减小到1.1 mg。

Si was added into iron-based high-carbon-high-chromium alloy powder for hardfacing so as to improve the performance of the hardfacing layer prepared by argon tungsten-arc welding technology.The effect of Si content on the microstructure,hardness,and wear resistance of the hardfacing layer was investigated.Results showed that the hardfacing layers obtained under different Si contents all had good metallurgical bonding with the Q235 steel substrate,and the hardfacing layers had similar microstructure and consisted of carbide networks(Cr7 C3 and Cr23 C6)as well as residual austenite eutectic and cellular residual austenite.When the Si content rose from 0 to 9.0%(mass fraction),the amount of the network structure in the hardfacing layers as well as the hardness of the cellular structure tended to rise,and the macro-hardness of the hardfacing layers rose from 55 HRC to60 HRC,while its wear mass loss declined from 16.8 mg to 1.1mg.