Effects of stress ratio on the temperature-dependent high-cycle fatigue properties of alloy steels
来源期刊：International Journal of Minerals Metallurgy and Materials2016年第12期
论文作者：Zhi-yang Lü Ao-shuang Wan Jun-jiang Xiong Kuang Li Jian-zhong Liu
文章页码：1387 - 1396
摘 要：This paper addresses the effects of stress ratio on the temperature-dependent high-cycle fatigue（HCF） properties of alloy steels 2CrMo and 9CrCo, which suffer from substantial vibrational loading at small stress amplitude, high stress ratio, and high frequency in the high-temperature environments in which they function as blade and rotor spindle materials in advanced gas or steam turbine engines. Fatigue tests were performed on alloy steels 2CrMo and 9CrCo subjected to constant-amplitude loading at four stress ratios and at four and three temperatures, respectively, to determine their temperature-dependent HCF properties. The interaction mechanisms between high temperature and stress ratio were deduced and compared with each other on the basis of the results of fractographic analysis. A phenomenological model was developed to evaluate the effects of stress ratio on the temperature-dependent HCF properties of alloy steels 2CrMo and 9CrCo. Good correlation was achieved between the predictions and actual experiments, demonstrating the practical and effective use of the proposed method.
Zhi-yang Lü1，Ao-shuang Wan1，Jun-jiang Xiong1，Kuang Li1，Jian-zhong Liu2
1. School of Transportation Science and Engineering, Beihang University2. Beijing Institute of Aeronautical Materials
摘 要：This paper addresses the effects of stress ratio on the temperature-dependent high-cycle fatigue（HCF） properties of alloy steels 2CrMo and 9CrCo, which suffer from substantial vibrational loading at small stress amplitude, high stress ratio, and high frequency in the high-temperature environments in which they function as blade and rotor spindle materials in advanced gas or steam turbine engines. Fatigue tests were performed on alloy steels 2CrMo and 9CrCo subjected to constant-amplitude loading at four stress ratios and at four and three temperatures, respectively, to determine their temperature-dependent HCF properties. The interaction mechanisms between high temperature and stress ratio were deduced and compared with each other on the basis of the results of fractographic analysis. A phenomenological model was developed to evaluate the effects of stress ratio on the temperature-dependent HCF properties of alloy steels 2CrMo and 9CrCo. Good correlation was achieved between the predictions and actual experiments, demonstrating the practical and effective use of the proposed method.
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