考虑晶粒尺寸影响的GH720Li高温合金蠕变疲劳寿命预测

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

Transactions of Nonferrous Metals Society of China Pub Date : 2025-03-01 DOI:10.1016/S1003-6326(24)66719-1

Bin ZHANG , Rong-qiao WANG , Dian-yin HU , Hong-bo LI , Kang-he JIANG , Jia-ming WEI , Hong ZHANG

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引用次数: 0

摘要

为了准确评价GH720Li高温合金的蠕变疲劳寿命，建立了反映蠕变损伤与低周疲劳损伤相互作用的寿命预测模型。平均晶粒尺寸为17.3 μm的GH720Li高温合金蠕变疲劳寿命预测结果基本在2倍的散射带内，表明预测寿命与实验数据吻合较好。然后，考虑双性能涡轮盘的晶粒尺寸由边缘向中心递减，引入晶界面积比，建立了蠕变疲劳的晶粒敏感寿命预测模型；改进后的模型克服了大多数传统预测方法不能反映晶粒尺寸与蠕变疲劳寿命关系的局限性。

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Creep-fatigue lifetime prediction of GH720Li superalloy considering effect of grain size

In order to accurately evaluate the creep-fatigue lifetime of GH720Li superalloy, a lifetime prediction model was established, reflecting the interaction between creep damage and low-cycle fatigue damage. The creep-fatigue lifetime prediction results of GH720Li superalloy with an average grain size of 17.3 μm were essentially within a scatter band of 2 times, indicating a strong agreement between the predicted lifetimes and experimental data. Then, considering that the grain size of the dual-property turbine disc decreases from the rim to the center, a grain-size-sensitive lifetime prediction model for creep-fatigue was established by introducing the ratio of grain boundary area. The improved model overcame the limitation of most traditional prediction methods, which failed to reflect the relationship between grain size and creep-fatigue lifetime.

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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.