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Predicting creep strengths and lifetimes of creep resistant engineering alloys

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Abstract

The physical basis for predicting the long-term creep strengths and lifetimes at application temperatures using creep parameters determined from short-term creep tests is investigated for complex creep resistant engineering alloys. It is shown that the seemingly unpredictable stress and temperature dependence of minimum creep rate of such alloys can be rationalised using an approach based on the new power law creep equation that incorporate the tensile strength. This is demonstrated using the tensile and creep data measured for two completely different types of alloys: steel 11Cr-2W-0.4Mo-1Cu-Nb-V and Ni base superalloy 15Cr-28Co-4Mo-2.5Ti-3Al. For both alloys, the stress exponent n determined does not depend on temperature and activation energy of creep does not depend on stress. Consequently, it becomes possible to use the new power law creep equation in combination with the Monkman-Grant relationship to predict the long term creep rupture strengths and lifetimes and microstructure stability of the two alloys from short term creep test data. The implications of the results for creep mechanism identification and future microstructure analysis are discussed.

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, P R China

    Yanrong Zhao, Hongpeng Yao, Xinli Song, Juan Jia & Zhidong Xiang

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  1. Yanrong Zhao
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  2. Hongpeng Yao
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  3. Xinli Song
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  4. Juan Jia
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  5. Zhidong Xiang
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Correspondence to Zhidong Xiang.

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Zhao, Y., Yao, H., Song, X. et al. Predicting creep strengths and lifetimes of creep resistant engineering alloys. Met. Mater. Int. 24, 51–59 (2018). https://doi.org/10.1007/s12540-017-7359-4

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