基于CMT焊接的双金属电弧增材成形件的组织和力学性能

发布时间：2018-06-25 07:17

本文选题：双金属电弧增材制造 + 显微组织　；参考：《热加工工艺》2017年17期

【摘要】：采用CMT(Cold Metal Transfer)焊接工艺,基体区选用ER80S-G焊丝,硬质区选用进口焊丝OK Tubrodur15.50进行双金属电弧增材试验,对成形件的横截面进行显微组织分析和硬度测试。结果表明:基体区的组织为粒状贝氏体、铁素体以及碳化物质点,各层的组织分布均匀;硬质区各层组织差别很大,底层以片状回火马氏体为主,随着层数的增加回火马氏体量减少,淬火马氏体量增多,最后一层由于没有受到回火作用,组织以淬火马氏体为主。成形件横截面的整体显微硬度分布较为合理,基体区的硬度变化不大,平均硬度为235.1 HV;硬质区的硬度随层数的增加逐渐增高,平均硬度为695.5 HV。
[Abstract]:Using CMT (Cold Metal transfer) welding process, ER80S-G wire was used in base area, and imported wire OK Tubrodur15.50 was used for bimetallic arc augmentation test in hard zone. Microstructure analysis and hardness test of the cross section of formed parts were carried out. The results show that the microstructure of the matrix region is granular bainite, ferrite and carbide particles, and the microstructure of each layer is uniform, the microstructure of each layer in the hard zone is very different, and the bottom layer is dominated by flake tempered martensite. With the increase of the layer number, the amount of tempered martensite decreases, and the quantity of quenched martensite increases. Because the last layer is not tempered, the microstructure is mainly quenched martensite. The microhardness distribution of the cross section of the forming parts is reasonable, the hardness of the matrix region is not changed much, the average hardness is 235.1 HV.The hardness of the hard zone increases with the increase of the number of layers, and the average hardness is 695.5 HV.
【作者单位】：福州大学机械工程及自动化学院;福建海源自动化机械股份有限公司;
【基金】：国家自然科学基金项目(5130501)
【分类号】：TG44;TH16

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