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| Citation: |
ZHU Qiang, XIA Yang, ZHANG Xingyue, HAN Ke, YAN Yaojing, DING Yuanyi, LEI Yucheng. Effect of Cu/V multi-interlayer on the microstructure and mechanical properties of TC4/IN718 joint by laser welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(7): 34-40. DOI: 10.12073/j.hjxb.20230714002
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In order to realize the effective connection between TC4 and GH4169 alloy, the Cu/V multi-interlayer was applied to join TC4 and IN718 alloy by continuous laser welding. The regulating mechanism of the Cu/V multi-interlayer on the cracks, microstructure and mechanical properties of TC4/IN718 joint was analyzed. The results show that a large number of Ti-Ni brittle intermetallic compounds are generated in the weld area of TC4/IN718 joint with the conventional laser welding, resulting in the formation of a large number of longitudinal cracks in the joint. The microstructure structure of weld zone in the TC4/IN718 joint is comprised of Ti(s,s) + Ti2Ni + Ti-Cr + NiTi + Ni3Ti + Cr(s,s). When adopting the Cu/V multi-interlayer, the effective joining between TC4 and IN718 alloy is realized, the tensile strength of the joint reaches 271MP. The microstructure structure of weld zone in the TC4/ Cu/V/IN718 joint is transformed into Ti(s,s) + V(s,s) + NiV3 + Cr(s,s) + Cu(s,s) + unmelted copper.
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