摘要
对SDDVA钢进行钨极氩弧堆焊和淬回火处理,研究了焊前和焊后淬回火工艺对堆焊层回火稳定性和抗热熔损性能的影响。结果表明:2种工艺下堆焊层的组织均为回火马氏体,但是焊后淬回火工艺下堆焊层中析出了更多弥散分布的碳化物且组织更细小,马氏体组织更稳定;焊后淬回火工艺下堆焊层经600℃×48 h回火后的硬度降低幅度仅为10.2%,小于焊前淬回火工艺的30.4%;在700℃铝液熔损试验中,焊前淬回火工艺下堆焊层的熔损质量损失大于焊后淬回火工艺,界面层的厚度较大,堆焊层与铝液的反应更加剧烈;焊后淬回火工艺下堆焊层具有更优异的回火稳定性和抗热熔损性能。
SDDVA steel was treated by tungsten argon arc surfacing and quenching and tempering. The effect of pre-and post-weld quenching and tempering on tempering stability and hot melting loss resistance of the surfacing layer was studied. The results show that the microstructure of the surfacing layer was tempered martensite under two processes. There were more dispersed carbides precipitated from the surfacing layer under post-weld quenching and tempering process, and the microstructure was smaller;the martensite structure was more stable. The hardness reduction of the surfacing layer under post-weld quenching and tempering process after tempering at 600 ℃ for 48 h was only 10.2%, which was less than 30.4% of the surfacing layer under pre-weld quenching and tempering process. In the molten aluminum melting loss test at 700 ℃, the melting loss mass loss of the surfacing layer under pre-weld quenching and tempering process was greater than that under the post-weld quenching and tempering process, the thickness of the interface layer was larger, and the reaction between the surfacing layer and liquid aluminum was more severe. The surfacing layer under post-weld quenching and tempering process had better tempering stability and hot melting loss resistance.
作者
吴少君
郭鹏
李玲
左鹏鹏
吴晓春
WU Shaojun;GUO Peng;LI Ling;ZUO Pengpeng;WU Xiaochun(College of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2022年第8期109-116,共8页
Materials For Mechanical Engineering
基金
国家重点研发计划项目(2016YFB0300404)。
关键词
SDDVA钢
淬回火
堆焊层
回火稳定性
抗热熔损性能
SDDVA steel
quenching and tempering
surfacing layer
tempering stability
hot melting loss resistance
作者简介
吴少君(1996-),男,江苏南通人,硕士研究生;吴晓春,教授。
