Precipitate phase behavior and mechanical properties of Inconel 718 according to aging heat treatment time

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2025-02-01 Epub Date: 2024-12-31 DOI:10.1016/j.msea.2024.147776

Gang Ho Lee , Byoungkoo Kim , Jong Bae Jeon , Minha Park , Sanghoon Noh , Byung Jun Kim

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Abstract

Inconel 718 is a precipitation-hardened alloy that achieves its excellent properties through the formation of γ′ and γ" precipitates via a two-step aging heat treatment (SHT). The precipitates formed during aging hinder dislocation movement, resulting in a strengthening effect. This strengthening effect is highly sensitive to the size and quantity of the precipitates. The formation of γ′ and γ" precipitates is particularly influenced by the aging heat treatment conditions, such as time. This study aims to analyze the initial formation and growth behavior of γ′ and γ" precipitates during aging heat treatment by evaluating the microstructure and mechanical properties according to heat treatment time. The experimental results showed that even during the early stages of aging heat treatment, with early stage aging for just 10 and 15 min, the γ′ and γ" precipitates formed and contributed to the strengthening of Inconel 718. Furthermore, analysis of varying the two-step aging heat treatment times revealed that as the aging time increased, the precipitates formed and grew more effectively, leading to increased strength and hardness. However, it was also observed that as the material's strength characteristics were enhanced, there was a transition in fracture behavior from ductile to brittle fracture.

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时效热处理时间对Inconel 718析出相行为及力学性能的影响

Inconel 718是一种沉淀硬化合金，其优异的性能是通过两步时效热处理（SHT）形成γ′和γ′析出而获得的。时效过程中形成的析出物阻碍位错运动，产生强化作用。这种强化效果对析出物的大小和数量高度敏感。时效热处理条件（如时间）对γ′和γ”析出相的形成影响较大。本研究旨在通过对热处理时间的显微组织和力学性能进行评价，分析时效热处理过程中γ′和γ′析出相的初始形成和生长行为。实验结果表明，即使在时效热处理的早期阶段，即时效时间仅为10和15 min时，γ′和γ”析出相的形成也有助于Inconel 718的强化。此外，对两步时效热处理次数的变化分析表明，随着时效时间的增加，析出相的形成和生长更加有效，从而导致强度和硬度的提高。然而，我们也观察到，随着材料强度特性的增强，断裂行为从韧性断裂向脆性断裂转变。

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

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.