A Functionally Graded Material Design from Stainless Steel to Ni-Based Superalloy by Laser Metal Deposition Coupled with Thermodynamic Prediction

Li, Kun; Zhan, Jianbin; Zhang, Ming; Ma, Ruijin; Tang, Qian; Zhang, Zhengwen; Murr, Lawrence E.; Cao, Huajun

doi:10.2139/ssrn.4016130

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“…Manufacturing AM-FGMs through DED has spread to many metallic system in recent years. Among these DED-FGMs, gradients from steel-based alloys to nickel-based alloys, i.e., FGMs 316L SS-IN718 has attracted extensive attention for many applications in which superior strength and corrosion resistance at elevated temperature is required, e.g., nuclear power generation and oil refineries [ 3 , 4 , 5 , 6 , 7 ]. This FGMs system, however, still faces some major challenges before being used in those specific applications in which creep damage is dominated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Creep Deformation and Fracture Properties for a Coarse-Grained Inconel 718 Manufactured by Directed Energy Deposition

et al. 2023

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The creep properties of a laser-directed energy deposition (L-DED) technique manufactured Inconel 718 (IN718) was investigated at 650 °C/700 MPa. Microstructure and creep properties of L-DED IN718 samples were tailored by various post heat treatments involving homogenization heat treatment with temperature ranging from 1080 to 1180 °C + double aging and hot isostatic pressing (HIP). Microstructural changes and their influence on the creep behavior and fracture mechanism were observed and discussed. The results show that L-DED sample heat treated by a simple double aging exhibits a 49% increase in creep lifetime tr and a comparable creep elongation ɛf when compared to the wrought material, due to the reserved coarse dislocation cell substructure from the L-DED process. The loss of dislocation cell structure and the coarsening of grains at higher temperature of heat treatments contributes to a shorter tr, εf, but faster ε̇min (minimum creep rate). The present work demonstrates that a simultaneous improvement of creep strength and creep elongation can be achieved in the case of a coarse-grained L-DED IN718 by a double aging treatment which can preserve both the strengthening precipitates and an appropriate size of dislocation cells.

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