Boron-induced suppression of recrystallization during creep in FeNi-based superalloy

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-09-19 DOI:10.1016/j.matchar.2025.115580

Cham Il Kim , Ji Yeong Lee , Won Tae Kim , Eun Soo Park , Heon Kang , Do Hyang Kim

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Abstract

This study investigates the effects of boron on microstructural evolution and creep properties in a FeNi-base superalloy, showing that boron plays a role in significant enhancement of the creep resistance by suppression of recrystallization during creep. Detailed analyses using transmission electron microscopy, atom probe tomography, and electron backscattered diffraction revealed that boron segregates at grain boundaries and at the interface between the matrix and the precipitate, thereby increasing grain boundary cohesion and suppressing dynamic recrystallization. Moreover, boron stabilizes the grain structure by increasing the recrystallization threshold, thus inhibiting recrystallization during creep. The effect of boron in strengthening the grain boundary is particularly pronounced in the creep test with lower strain rate, where it effectively extends the creep rupture life, while this effect is less emphasized in the high temperature tensile test with higher strain rate. These findings suggest that the addition of boron is crucial for the optimization of the high-temperature performance of FeNi-base superalloys.

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硼对镍基高温合金蠕变过程中再结晶的抑制作用

本研究研究了硼对feni基高温合金组织演变和蠕变性能的影响，结果表明硼通过抑制蠕变过程中的再结晶，显著提高了合金的抗蠕变能力。通过透射电镜、原子探针层析成像和电子背散射衍射的详细分析表明，硼在晶界和基体与析出相的界面处偏析，从而增加了晶界内聚，抑制了动态再结晶。此外，硼通过增加再结晶阈值来稳定晶粒结构，从而抑制蠕变过程中的再结晶。在低应变速率蠕变试验中，硼强化晶界的作用尤为明显，有效延长了蠕变断裂寿命，而在高应变速率高温拉伸试验中，硼强化晶界的作用则不那么突出。这些结果表明，硼的加入对优化镍基高温合金的高温性能至关重要。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.