Mo元素对Fe-Cr-Mo-C堆焊合金组织和性能的影响  

Effect of Mo on the microstructure and properties of Fe-Cr-Mo-C hardfacing layers

作　　者：宗琳[1] 周建 杨洋[1] 王明 ZONG Lin;ZHOU Jian;YANG Yang

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110142 [2]中建安装集团有限公司,江苏南京210046

出　　处：《焊接技术》2021年第3期15-18,I0007,共5页Welding Technology

基　　金：国家自然科学基金青年基金(51901141);辽宁省教育厅科学研究项目(LJ2020034)。

摘　　要：采用等离子弧堆焊技术对不同Mo含量的Fe-Cr-Mo-C系合金进行堆焊,研究不同Mo含量对Fe-Cr-Mo-C堆焊层组织和性能的影响。采用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对堆焊层组织和物相进行分析,采用显微硬度计对堆焊层显微硬度进行测试。结果表明:Fe-Cr-Mo-C合金组织由γ,M_(23)C_(6),M_(2)C以及M_(6)C组成,随着合金中Mo含量的增加,M_(23)C_(6)数量逐渐减少,蜂窝状的共晶碳化物M_(2)C数量逐渐增多,且M_(2)C逐渐转变为菊花状的共晶碳化物M_(6)C,大量高硬度M_(2)C均匀分布在堆焊层中,使得w(Mo)8.2%和w(Mo)10.1%合金堆焊层顶端显微硬度平均值较高,达到HV_(0.2)795,有利于促进堆焊层耐磨性的提高。A series of Fe-Cr-Mo-C hardfacing alloys with different Mo contents were prepared by plasma arc surfacing.The effects of addition amount of Mo on microstructure and properties of hardfacing layers were studied.The microstructure and phase were analyzed by means of scanning electron microscopy and X-ray diffraction,the microhardness test was carried out.The results showed that the microstructure of surfacing layers were composed of austenite,M_(23)C_(6),M_(2)C and M_(6)C,the volume fraction of M_(23)C_(6) decreased,the volume fraction of M_(2)C with honeycomb shape increased and gradually changed to M_(6)C with rosette shape as Mo content increased.When Mo content was 8.2%and 10.1%,the highest microhardness on the top of the hardfacing layer was up to HV_(0.2)795 as the result of the microstructure characteristic with a high volume fraction of M_(2)C were distributed uniformly and dispersly in the matrix,which was favorable to the improvement of wear resistance.

关 键 词：等离子弧堆焊 显微硬度 组织 Fe-Cr-Mo-C系 

分 类 号：TH117.3[机械工程—机械设计及理论]