Heterogeneous interfaces of aluminum bronze/Inconel 718 dissimilar alloys under different wire arc directed energy deposition sequences  

作　　者：Tianxing Chang Xuewei Fang You Zhou Hongkai Zhang Naiyuan Xi Shahid Ghafoor Ke Huang 

机构地区：[1]The State Key Laboratory for Manufacturing Systems Engineering,Xi’an Jiaotong University,No.99 Yan Cheung Road,Xi’an,Shaanxi 710054,People’s Republic of China

出　　处：《International Journal of Extreme Manufacturing》2025年第1期368-381,共14页极端制造(英文)

基　　金：supported by the Key Research and Development Program of Shaanxi Province(2023-YBGY361);the National Natural Science Foundation of China(52275374 and 52205414);the Postdoctoral Fellowship Program of CPSF(GZC20232098);as well as the Xiaomi Foundation through Xiaomi Young Scholar Program。

摘　　要：The layer-by-layer deposition strategy of additive manufacturing makes it ideal to fabricate dissimilar alloy components with varying functionality,which has promising application potential in a large number of industrial areas.In this study,two components composed of ERCuAl-A2 aluminum bronze(CuAl9)and Inconel 718 nickel-based superalloy were fabricated with different deposition orders by wire-arc directed energy deposition.Subject to changes in heat input and thermophysical properties of the substrate,the transition region of the deposited Cu-Ni component with the bottom half of CuAl9 and the top half of Inconel 718 is narrow and serrated.This region features a laminated intermetallic compound layer due to the convection and rapid cooling in the molten pool.In contrast,the Ni-Cu component deposited in the opposite order exhibits a 2 mm gradient transition zone.Within this region,a large number of diverse precipitates were found as well as regional variations in grain size due to the multi-layer partial remelting.Both two components show strong bonds and their tensile specimens tested along the vertical direction always fracture at the softer CuAl9 side.Excellent tensile properties along the horizontal direction were obtained for Cu-Ni(Ultimate tensile strength:573 MPa,yield stress:302 MPa,elongation:22%),while those of Ni-Cu are much lower due to the existence of the solidification cracks in the transition zone.The results from this study provide a reference for the additive manufacturing of Cu/Ni dissimilar alloy components,as well as their microstructure and mechanical properties control.

关 键 词：wire-arc directed energy deposition dissimilar alloys microstructure aluminum bronze nickel-based super-alloy 

分 类 号：TG1[金属学及工艺—金属学]