Effect of heat treatment and hot isostatic pressing on the structure and mechanical properties of Inconel 939 manufactured via casting and LPBF

IF 6.1 1区工程技术 Q1 ENGINEERING, MANUFACTURING

Journal of Manufacturing Processes Pub Date : 2025-04-30 DOI:10.1016/j.jmapro.2025.04.082

Josef Sedlak , Jan Zouhar , Zdenek Pokorny , Jan Robl , Stepan Kolomy , Marek Pagac , Karel Kouril

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引用次数: 0

Abstract

The powder bed fusion method is one of the metal additive technologies, which can be used for the fabrication of difficult-to-process materials, such as cobalt and nickel superalloys. Inconel 939 is an example of a nickel superalloy widely used in constructions subjected to high temperatures such as industrial gas turbines. The current paper studies the effect of heat treatment and Hot Isostatic Pressing (HIP) on the structure and mechanical properties of additively manufactured (AM) Inconel 939. Mechanical properties i.e., tensile yield strength, ultimate tensile strength, and creep resistance were observed after the heat treatment (comprised of annealing and subsequent aging), HIP, and compared to the conventionally casted material. HIP post-process caused an increase of 5.73 % and 3.81 % in ultimate tensile strength at the room temperature as well as at the elevated temperature. A detailed analysis of the microstructure of AM and casting samples via light and electron microscopy was performed. The maximum grain sizes in AM samples were similar (122.9 μm and 127.2 μm in the axis and periphery, respectively), while the grain size in casting samples exhibited a mean equivalent circle diameter of 440 μm in the axial region and 398 μm in the vicinity of the peripheral region.

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热处理和热等静压对铸造和LPBF法制备Inconel 939组织和力学性能的影响

粉末床熔合法是一种金属增材技术，可用于制备钴、镍高温合金等难加工材料。Inconel 939是镍高温合金的一个例子，广泛应用于高温建筑，如工业燃气轮机。本文研究了热处理和热等静压对增材制造（AM） Inconel 939组织和力学性能的影响。机械性能，即抗拉屈服强度，极限抗拉强度和抗蠕变性能观察后，热处理（包括退火和随后的时效），HIP，并与传统铸造材料进行比较。热处理后的室温和高温拉伸强度分别提高了5.73%和3.81%。通过光学显微镜和电子显微镜对AM和铸造样品的微观结构进行了详细的分析。AM试样的最大晶粒尺寸相似（轴向122.9 μm和外围127.2 μm），而铸造试样的平均等效圆直径在轴向440 μm，在外围附近398 μm。

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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来源期刊

Journal of Manufacturing Processes ENGINEERING, MANUFACTURING-

CiteScore

10.20

自引率

11.30%

发文量

833

审稿时长

50 days

期刊介绍： The aim of the Journal of Manufacturing Processes (JMP) is to exchange current and future directions of manufacturing processes research, development and implementation, and to publish archival scholarly literature with a view to advancing state-of-the-art manufacturing processes and encouraging innovation for developing new and efficient processes. The journal will also publish from other research communities for rapid communication of innovative new concepts. Special-topic issues on emerging technologies and invited papers will also be published.