镍基合金焊缝金属热裂纹及接头强韧性的研究进展

发布时间：2019-01-26 07:00

【摘要】：综述了镍基合金焊缝金属在热裂纹及接头强韧性方面的最新研究进展,得出:1)焊丝中添加Nb、Al、Ti、Ce等合金元素可降低焊缝金属高温失塑裂纹敏感性,添加Mn和Mg可抑制S、P、Si、Bi等低熔点化合物的生成,控制药芯组成中TiO2、SiO2、ZrO2、MnO2等造渣剂之间比例关系,有助于提高焊缝金属抗热裂纹性;2)采用合适的焊接工艺可有效避免焊缝金属热裂纹的产生,其中,激光焊、电子束焊等新型焊接工艺对焊缝金属热裂纹的影响逐渐成为研究热点;3)采用固溶+双级时效的焊后热处理工艺,可改善焊接接头的强韧性,焊丝中添加Al、Ti、Nb、Mo、Mn等合金元素可提高焊接接头抗拉强度,但随着Mn质量分数的增加,接头冲击韧性降低.
[Abstract]:The latest research progress on hot crack and joint strength and toughness of weld metal in nickel base alloy is reviewed. The results are as follows: 1) addition of Nb,Al,Ti,Ce and other alloying elements in welding wire can reduce the susceptibility of weld metal to high temperature loss of plastic crack. The addition of Mn and Mg can inhibit the formation of low melting point compounds, control the proportion of slagging agents such as TiO2,SiO2,ZrO2,MnO2 in the composition of the core, and help to improve the thermal crack resistance of weld metal. 2) the effect of laser welding, electron beam welding and other new welding processes on the weld metal hot cracks can be avoided effectively by adopting appropriate welding technology, among which, the effect of laser welding, electron beam welding and other new welding processes on the weld metal hot cracks has gradually become a hot research topic; 3) the strength and toughness of the welded joint can be improved by adopting the post-welding heat treatment process of solid solution two-stage aging. The tensile strength of the welded joint can be improved by adding Al,Ti,Nb,Mo,Mn and other alloy elements into the wire, but with the increase of the mass fraction of Mn, the tensile strength of the welded joint can be improved with the increase of the mass fraction of Mn. Joint impact toughness reduced.
【作者单位】：北京工业大学材料科学与工程学院;德国多特蒙德工业大学材料工程研究所;北京金威焊材有限公司;菲拉克焊接江苏有限公司;
【基金】：北京市自然科学基金资助项目(2152008)
【分类号】：TG407

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