长期热暴露过程中μ相和M23C6碳化物析出行为对DD5单晶高温合金组织和蠕变性能的影响

IF 1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials at High Temperatures Pub Date : 2023-05-04 DOI:10.1080/09603409.2023.2208956

Xudong Wang, Zhong-Xi Yang, Peisen Lv, Lirong Liu

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引用次数: 0

摘要

详细研究了μ相和M23C6碳化物对DD5单晶高温合金在1000℃长期热暴露过程中显微组织和蠕变性能的影响。结果表明:在1000℃高温下，针状μ相和粒状M23C6碳化物主要在枝晶臂和枝晶间析出;析出相的数量随着曝光时间的增加而增加。在1038℃/172 MPa条件下，与标准热处理后的试样相比，暴露500 h时由于大量M23C6颗粒析出，蠕变寿命提高了38%，而暴露1000 h时由于μ相析出较多，γ′相降解，蠕变寿命降低了60%。拉伸应力也促进了μ相和M23C6碳化物的析出。

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Effect of precipitation behaviour of μ phase and M23C6 carbide on microstructure and creep properties of DD5 single-crystal superalloy during long-term thermal exposure

ABSTRACT The effects of μ phase and M23C6 carbide on microstructure and creep properties of DD5 single-crystal superalloy during long-term thermal exposure at 1000°C were investigated in detail. It was found that during thermal exposure at 1000°C, the needle-like μ phase and granular M23C6 carbide were mainly precipitated in dendrite arm and interdendritic regions, respectively. The amount of precipitated phases rose with increasing exposure time. Under the condition of 1038ºC/172 MPa, compared with the sample after standard heat treatment, the creep life of sample exposed for 500 h was increased by 38% due to the precipitation of a large number of M23C6 particles, while that exposed for 1000 h was reduced by 60% due to the precipitation of more μ phase and degradation of γ′ phase. Furthermore, tensile stress could also promote the precipitation of μ phase and M23C6 carbide.

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来源期刊

Materials at High Temperatures 工程技术-材料科学：综合

CiteScore

1.90

自引率

15.40%

发文量

审稿时长

>12 weeks

期刊介绍： Materials at High Temperatures welcomes contributions relating to high temperature applications in the energy generation, aerospace, chemical and process industries. The effects of high temperatures and extreme environments on the corrosion and oxidation, fatigue, creep, strength and wear of metallic alloys, ceramics, intermetallics, and refractory and composite materials relative to these industries are covered. Papers on the modelling of behaviour and life prediction are also welcome, provided these are validated by experimental data and explicitly linked to actual or potential applications. Contributions addressing the needs of designers and engineers (e.g. standards and codes of practice) relative to the areas of interest of this journal also fall within the scope. The term ''high temperatures'' refers to the subsequent temperatures of application and not, for example, to those of processing itself. Materials at High Temperatures publishes regular thematic issues on topics of current interest. Proposals for issues are welcomed; please contact one of the Editors with details.