Abstract Activated flux-tungsten inert gas (A-TIG) weld joint of dissimilar martensitic-austenitic steel possesses low strength-ductility synergy and poor impact toughness due to the formation of hard and brittle martensitic structure in the weld zone (WZ). In the present work, a pathway is proposed to improve the strength-ductility synergy and impact toughness of such dissimilar weld joints by feeding the ErNiCrMo-3 wire into the weld pool during welding. ‘A-TIG welding with wire feed’ (patent pending*) successfully modified the WZ chemical composition (Creq: 15.01 and Nieq: 28.16), which altered its microstructure from hard and brittle martensite to Fe-Ni-Cr rich soft austenite. As a result, a superior strength-ductility synergy (ultimate tensile strength: 684.9 MPa and elongation: 45.8%) and unprecedented impact toughness (89 ± 2.4 J) was achieved.

中文翻译：

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送丝A-TIG焊提高异种马氏体-奥氏体钢接头的强度-塑性协同作用和冲击韧性

摘要 异种马氏体-奥氏体钢活性助焊剂-钨极惰性气体保护（A-TIG）焊接接头由于在焊缝区（WZ）形成硬而脆的马氏体组织，强度-塑性协同作用低，冲击韧性差。在目前的工作中，提出了一种通过在焊接过程中将 ErNiCrMo-3 焊丝送入熔池来提高这种异种焊接接头的强度-延展性协同作用和冲击韧性的途径。“带送丝的 A-TIG 焊接”（专利申请中*）成功地改变了 WZ 的化学成分（Creq：15.01 和 Nieq：28.16），将其微观结构从硬而脆的马氏体转变为富含 Fe-Ni-Cr 的软奥氏体。因此，优异的强度-延展性协同作用（极限拉伸强度：684.9 MPa 和伸长率：45.8%）和前所未有的冲击韧性 (89 ± 2.