Cr对Fe-Cr-B-C系堆焊合金热处理后的组织和磨损性能的影响  

Effect of chromium on microstructure and wear resistance of Fe-Cr-B-C hardfacing alloys after heat treatment

作　　者：汪圣林 崔丽[1] 贺定勇[1,2] 王智慧[1] 蒋建敏[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124 [2]北京市生态环境材料及其评价工程技术研究中心,北京100124

出　　处：《材料热处理学报》2015年第10期224-229,共6页Transactions of Materials and Heat Treatment

基　　金：北京市教育委员会科技项目(PXM2014_014204_07_000040)

摘　　要：观察采用药芯焊丝堆焊方法在Q235钢基体上制备了含Cr含量分别为12%、14%、16%和18%的Fe-Cr-B-C系耐磨合金。对堆焊合金进行600℃热处理,研究了不同Cr含量对焊态和热处理后堆焊合金的显微组织和磨粒耐磨性能的影响。结果表明,堆焊合金硬质相主要为(Fe,Cr)23(B,C)6,焊态基体组织为马氏体和残留奥氏体,热处理后基体组织为回火索氏体;当Cr含量达到14%,硬质相(Fe,Cr)23(B,C)6高温下稳定;Cr含量对堆焊合金热处理后磨损性能有很大影响,含12%Cr堆焊合金的相对耐磨性由焊态的10.65下降到2.08,耐磨性只有焊态的19.5%,而16%Cr的堆焊合金热处理后耐磨性为9.08,具有良好的耐磨性能。Fe-Cr-B-C system alloys with different chromium contents of 12%,14%,16% and 18% were deposited on Q235 steel by fluxcored wire arc welding,and then the hardfacing alloys were subjected to heat treatment at 600 ℃ for 8 h. The influence of chromium content on microstructure and wear resistance of the hardfacing alloys as-welded and heat treated were investigated. The results show that the main hard phases of the hardfacing alloys are（ Fe,Cr）23（ B,C）6particles. The matrix in as welded state is composed of martensite and residual austenite. The microstructure of the matrix changes to tempered sorbite after heat treatment. The（ Fe,Cr）23（ B,C）6phase is stable when the chromium content reaches up to 14%. The content of Cr has significant influence on the high temperature wear resistance of the hardfacing alloys. After heat treatment,the relative wear resistance of the hardfacing alloy containing 12% Cr decreases from 10. 65 to 2. 08,only 19. 5% of the wear resistance of the hardfacing alloy in as welded state,while the relative wear resistance of the hardfacing alloy with 16% Cr is 9. 08 after heat treatment,indicating a good wear resistance.

关 键 词：堆焊合金 热处理 显微组织 耐磨性能 

分 类 号：TG404[金属学及工艺—焊接]