Enhanced ultra-high temperature creep resistance originating from preferred microstructures of W-Re-HfC alloys

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-12-01 DOI:10.1016/j.matchar.2024.114585

Shuai Ma , Di Dong , Mengyao Zhang , Ye Gao , Zhuangzhi Wu , Dezhi Wang

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Abstract

W-Re-HfC alloys have been extensively applied in the field of high-temperature structural parts. To ensure high temperature reliability, it is essential to enhance creep resistance ability. In this study, the microstructures of forged W-Re-HfC alloys were adjusted using different heat treatment processes. The corresponding tensile creep properties were also measured at 2000 °C with 40 MPa. Furthermore, a possible creep fracture mechanism was also explored. The forged W-Re-HfC sample annealed for 2 h exhibited the best creep performances with a steady-state creep rate of 3.28 × 10⁻⁶ and a creep life of 5.6 h. Generally, a larger grain size indicates a lower steady-state creep rate; however, the precipitation of carbides at the grain boundaries (GBs) deteriorates the bonding strength of interfaces, thus reversing the former trend. The dominant creep mechanism is diffusion creep, in which the voids nucleate perpendicular to the GBs, grow and connect into cracks, ultimately leading to fractures.

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W-Re-HfC合金的择优组织增强了其抗超高温蠕变性能

W-Re-HfC合金在高温结构件领域得到了广泛应用。为了保证高温可靠性，必须提高抗蠕变能力。在本研究中，采用不同的热处理工艺对锻造W-Re-HfC合金的组织进行了调整。在2000℃、40 MPa条件下，测定了相应的拉伸蠕变性能。此外，还探讨了可能的蠕变断裂机制。锻造后的W-Re-HfC试样退火2 h后蠕变性能最佳，稳态蠕变速率为3.28 × 10−6，蠕变寿命为5.6 h。然而，晶界处碳化物的析出使界面的结合强度下降，从而逆转了先前的趋势。蠕变的主要机制是扩散蠕变，在扩散蠕变中，空洞垂直于GBs形核，扩展并连接成裂纹，最终导致断裂。

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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.