焊前和焊后淬回火对SDDVA钢堆焊层回火稳定性和抗热熔损性能的影响  

Effect of Pre- and Post-Weld Quenching and Tempering on Tempering Stability and Hot Melting Loss Resistance of Surfacing Layer of SDDVA Steel

作　　者：吴少君 郭鹏 李玲[1,2] 左鹏鹏 吴晓春[1,2] 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)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444

出　　处：《机械工程材料》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)。

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.

关 键 词：SDDVA钢 淬回火 堆焊层 回火稳定性 抗热熔损性能 

分 类 号：TG142[一般工业技术—材料科学与工程]