热输入对2.25Cr-1Mo-0.25V钢埋弧焊焊缝金属韧性的影响  

Effect of Heat Input on Metal Toughness of 2.25Cr-1Mo-0.25V Steel Submerged Arc Welding Weld

作　　者：李景艺 潘强 陈广军 杨耀华 刘尔玺 王譞 LI Jingyi;PAN Qiang;CHEN Guangjun;YANG Yaohua;LIU Erxi;WANG Xuan(Lanzhou Lanshi group LA NTUO Agricultural Equipment Co.,Ltd.,Lanzhou 730314,China;Lanzhou Lanshi energy equipment engineering research institute Co.,Ltd.,Lanzhou 730314,China)

机构地区：[1]兰州兰石集团兰驼农业装备有限公司,兰州730314 [2]兰州兰石能源装备工程研究院有限公司,兰州730314

出　　处：《焊管》2018年第7期57-59,64,共4页Welded Pipe and Tube

摘　　要：为了验证Cr-Mo-V钢在较大规范下焊接的可行性,通过化学成分、力学性能及微观形貌等试验,对2.25Cr-1Mo-0.25V钢在3组不同热输入下埋弧焊焊缝金属韧性进行了研究。试验结果显示,随着焊接热输入的增大,化学成分变化不大,熔敷金属强度增高,冲击韧性略有降低;焊缝金属的组织均为贝氏体回火组织,分布均匀、细化。研究结果表明,适当加大焊接热输入,不会引起焊缝金属冲击韧性的大幅度下降,对于焊缝金属的贝氏体回火组织的充分转变有一定好处,而且可以提高熔敷效率、减少夹渣等缺陷的产生。In order to verify the feasibility of welding Cr-Mo-V steel under larger specifications, the submerged arc welded metal toughness of 2.25 Cr-1 Mo-0.25 V steel under 3 sets heat input were studied by chemical composition, mechanical properties and microscopic morphology tests. The results showed that with the increase of welding heat input, the chemical composition changed little, the strength of the deposited metal increased, and the impact toughness decreased slightly. At the same time, the microstructure of the weld metal was tempered bainite with uniform distribution and refinement. The results of the study indicated that appropriately increasing welding heat input would not lead to a significant decrease in the impact toughness of the weld metal, it was benefitial to the full transformation of the weld metal tempered bainite structure, and at the same time, and it could also improve the deposition efficiency and reduce the generation of slag inclusions.

关 键 词：2.25CR-1MO-0.25V钢 热输入 冲击韧性 贝氏体 熔敷效率 

分 类 号：TG407[金属学及工艺—焊接]