摘要
采用CO2气体保护焊/喷射送粉设备在Q235钢表面制备了Fe-Cr-C-Mo-V耐磨堆焊层。通过金相显微镜、SEM,XRD,DEAX等手段研究了V加入量对堆焊层组织、成分、硬度和耐磨性的影响规律。结果表明:随着V含量的增加,堆焊层组织由针状马氏体+奥氏体向板条马氏体+奥氏体转变,而碳化物由单一M7C3型碳化物转变成由VC和M7C3组成的2种碳化物;堆焊层的硬度先升高后降低,当w(V)20%时,硬度最高,其数值HRC60.6。堆焊层耐磨性与硬度变化趋势相同,w(V)20%的堆焊层耐磨性最佳。
Fe-Cr-C-Mo-V wear resistant surfacing layer was prepared on the surface of Q235 steel by using CO_2 gas shielded welding equipment with spraying powder feeding. Effects of V content on the microstructure, composition,hardness and wear resistance of the surfacing layer were studied by metallographic microscope, SEM, XRD and DEAX. Results showed that with the increase of V content, the structure of the surfacing layer changed from acicular martensite and austenite to lath martensite and austenite, while the single M7C3 was converted to two carbides of VC and M7C3. The hardness of the layer increased firstly and then decreased. When the V content was 20%, the hardness of the layer was highest with HRC60.6. The wear resistance had the same change trend as that of the hardness. When the V content was 20%, the wear-resistance was the best among the surfacing layers.
出处
《焊接技术》
2018年第7期4-7,共4页
Welding Technology
基金
黑龙江省教育厅基本科研业务费(2016-KYYWF-0552)
佳木斯大学科技创新团队项目(cxtd2013-03)
关键词
堆焊层
钒
组织
耐磨性
surfacing layer
vanadium
microstructure
wear resistance
