Tailoring microstructure, tensile properties, and creep resistance of additively manufactured Inconel 718 superalloy by post heat treatment

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

Transactions of Nonferrous Metals Society of China Pub Date : 2025-06-01 DOI:10.1016/S1003-6326(25)66789-6

Sajad GHAEMIFAR , Milad ROOSTAEI , Mohammad REZA ZAMANI , Stefan WURSTER , Hamed MIRZADEH

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引用次数: 0

Abstract

The effects of post heat treatment on the microstructure, aging kinetics, and room/elevated temperature mechanical properties of additively manufactured Inconel 718 superalloy were investigated. Scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), and X-ray diffraction (XRD), as well as hardness, tensile, and creep testing were used for characterization. At temperatures higher than 1100 °C, homogenization treatment resulted in the appearance of equiaxed grains by recrystallization and diminishing the dislocation density. The precipitation activation energy for the homogenized and aged condition was obtained as 203.2 kJ/mol, which was higher than the value of ~160 kJ/mol for the as-built IN718 superalloy. Therefore, direct aging resulted in a faster aging response, which led to a significant improvement in tensile properties, as rationalized by the strengthening mechanisms. Direct aging treatment resulted in a higher elevated-temperature ultimate tensile strength (UTS) as well as the optimum creep life and the lowest minimum creep rate in comparison with other heat treatment routes, which were attributed to the presence of fine and uniformly dispersed strengthening precipitates in conjunction with the high dislocation density.

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热处理后增材制造Inconel 718高温合金的显微组织、拉伸性能和抗蠕变性能

研究了热处理对增材制造Inconel 718高温合金显微组织、时效动力学和室温/高温力学性能的影响。通过扫描电镜（SEM）、电子背散射衍射（EBSD）、x射线衍射（XRD）以及硬度、拉伸和蠕变测试对材料进行了表征。当温度高于1100℃时，均质化处理通过再结晶和减小位错密度导致等轴晶粒的出现。均匀时效条件下的析出活化能为203.2 kJ/mol，高于铸态IN718合金的~160 kJ/mol。因此，直接时效导致了更快的时效响应，从而导致了拉伸性能的显著改善，这是由强化机制合理的。与其他热处理方式相比，直接时效处理具有更高的高温极限抗拉强度（UTS）、最佳蠕变寿命和最低蠕变速率，这是由于存在细小且均匀分散的强化相，同时存在较高的位错密度。

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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.