Ultra-high strength Inconel 718 alloy produced by a novel heat treatment

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI:10.1016/S1003-6326(24)66535-0

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Abstract

In order to ameliorate microstructure and optimize properties of Inconel 718 alloy, a novel heat treatment method combining high-temperature ultra-short annealing at 980 °C for 1 min with subsequent double aging was proposed. The results showed that ultra-short annealing generated partially recrystallized microstructure and recrystallized nuclei were formed even in deformed grains, which was confirmed by KAM maps. Therefore, high-temperature ultra-short annealing overcame recrystallization barrier, and the subsequent recrystallization process could be completed during aging treatment with relatively low temperature, resulting in the uniformly refined microstructure (∼3.59 µm). The 980-1min-aged sample exhibited outstanding tensile properties. The room temperature ultimate strength and total elongation were 1600 MPa and 19%, respectively. The corresponding values of high- temperature (650 °C) tensile tests were ∼1350 MPa and ∼26%. Consequently, ultra-short annealing can be a promising route to enhance the properties of Inconel 718 alloy.

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通过新型热处理生产超高强度铬镍铁合金 718

为了改善 Inconel 718 合金的微观结构并优化其性能，提出了一种新的热处理方法，该方法结合了 980 °C 高温超短退火 1 分钟和随后的双重时效。结果表明，超短退火产生了部分再结晶的微观结构，即使在变形晶粒中也形成了再结晶晶核，这一点得到了 KAM 图谱的证实。因此，高温超短退火克服了再结晶障碍，随后的再结晶过程可在温度相对较低的时效处理过程中完成，从而获得均匀细化的微观结构（∼3.59 µm）。980-1 分钟老化的样品具有出色的拉伸性能。室温极限强度和总伸长率分别为 1600 兆帕和 19%。高温（650 °C）拉伸试验的相应值分别为 1350 兆帕和∼26%。因此，超短退火是提高 Inconel 718 合金性能的一条可行途径。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.