Effect of Aging Parameters on Inconel 718 Fabricated by Laser Directed Energy Deposition

Chinese Journal of Mechanical Engineering: Additive Manufacturing Frontiers Pub Date : 2023-10-29 DOI:10.1016/j.cjmeam.2023.100101

Nataniel Yong Syn Tham , Grace Rui Si Tay , Bingqing Yao , Kaiqiang Wu , ZhiLi Dong

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Abstract

Inconel 718 is a nickel-based superalloy of high interest in high temperature applications such as turbine parts. To be used in such applications, heat treatments are commonly applied to dissolute Laves phase and to achieve γ′′ phase. However, conventional heat treatment methods for wrought Inconel 718 may not be suitable for Inconel 718 fabricated by laser directed energy deposition (LDED) due to its unique microstructure formed during the rapid solidification process. There has been a lack of investigation in heat treatments for Inconel 718 fabricated by this process, specifically around the impact of aging parameters on this alloy. In this study, the effects of aging parameters were studied by performing seven different heat treatments, including solutionising and aging treatments. Our results indicate that for LDED Inconel 718, a high temperature solution treatment of 1100 ℃ for 1 h followed by single aging at 650 ℃ for 20 h achieved a tensile strength and elongation of 1247 MPa and 23%, respectively. Further, results indicated that even with a shorter aging time of 10 h, γ′′ phase was found to be of comparable size to the standard double aged treatment.

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时效参数对激光定向能沉积制备Inconel 718的影响

Inconel 718是一种镍基高温合金，在涡轮部件等高温应用中非常受欢迎。为了在这样的应用中使用，通常采用热处理来溶解Laves相并获得γ”相。然而，由于激光定向能量沉积(LDED)制备的Inconel 718在快速凝固过程中形成了独特的微观组织，传统的热处理方法可能不适用于变形Inconel 718。对于用该工艺制造的因科耐尔718的热处理，特别是时效参数对该合金的影响的研究一直缺乏。在这项研究中，通过进行7种不同的热处理，包括固溶和时效处理，研究了时效参数的影响。结果表明，对led材料Inconel 718进行1100℃高温固溶处理1 h, 650℃单次时效20 h，抗拉强度和伸长率分别达到1247 MPa和23%。此外，结果表明，即使时效时间较短(10 h)， γ”相的尺寸也与标准双时效处理相当。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Chinese Journal of Mechanical Engineering: Additive Manufacturing Frontiers

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