Effect of Co additive on high temperature property of hardfacing alloy

Co对多元碳化物复合熔覆层高温性能的影响 Effect of Co additive on high temperature property of hardfacing alloy 龙伟民 LONG Weimin 1 first-author 刘大双 LIU Dashuang 1 傅玉灿 FU Yucan 1 吴铭方 WU Mingfang 1 贾连辉 JIA Lianhui 1 中机智能装备创新研究院(宁波)有限公司  2. 江苏科技大学材料科学与工程学院  3. 南京航空航天大学机电学院  4. 中铁工程装备集团有限公司  中机智能装备创新研究院(宁波)有限公司  2. 江苏科技大学材料科学与工程学院  3. 南京航空航天大学机电学院  4. 中铁工程装备集团有限公司  China Innovation Academy of Intelligent Equipment Co., Ltd China Innovation Academy of Intelligent Equipment Co., Ltd 通过药芯焊丝电弧堆焊的方法制备出不同Co添加量的多元碳化物复合熔覆层,该熔覆层相组成为M 7 （C, B） 3 、M 3 （C, B）碳化物、马氏体及少量残余奥氏体（M=Cr、Fe、Mn、Co等）,且随着Co添加量的增加,组织中奥氏体枝晶数量增加,尺寸亦有所增大。多元碳化物复合熔覆层经高温回火（600℃×4 h）后,初生M 7 （C, B） 3 碳化物及共晶M 3 （C, B）碳化物均未发现明显变化,而奥氏体颜色变为灰黑,随着Co添加量的增加,多元碳化物复合熔覆层的高温回火稳定性逐渐增加。此外,当Co添加量为6%时,多元碳化物复合熔覆层的高温耐磨性最佳,这与该多元复合熔覆层在高温下仍具有最高的硬度及良好的高温回火稳定性密切相关。 The multi carbide composite cladding layers with different Co contents were prepared by fluxcored wire arc welding. The microstructure of the cladding layer was composed of M7（C, B）3, M3（C, B） carbide, martensite and a small amount of retained austenite（M = Cr, Fe, Mn, Co, etc.）. With the increase of Co content, the amount and size of austenite dendrite was increased. After high temperature tempering（600 ℃× 4 h）, the primary M7（C, B）3 carbides and eutectic M3（C, B） carbides didn’t change obviously, but the color austenite turned gray black, which indicated that austenite was oxidized. Moreover, the high temperature tempering stability of multi carbide composite cladding layer was increased gradually. In addition, when the Co content is 6%, the best high temperature wear resistance of the multi-component carbide composite cladding layer was closely related to the highest hardness and good high-temperature tempering stability of the multi-component composite cladding layer. Co含量 多元碳化物 高温耐磨性 复合熔覆层 药芯焊丝 Co content multiple carbides high temperature wear resistance composite cladding layer fluxcored wire TG174.4 2022-03-08 9 50