A modified θ projection model for constant load creep curves-Ⅱ.Application of creep life prediction

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英文篇名：A modified θ projection model for constant load creep curves-Ⅱ.Application of creep life prediction 作者：Chao ; Fu ; Yadong ; Chen ; Xiaofei ; Yuan ; Sammy ; Tin ; Stoichko ; Antonov ; Koichi ; Yagi ; Qiang ; Feng 英文作者：Chao Fu;Yadong Chen;Xiaofei Yuan;Sammy Tin;Stoichko Antonov;Koichi Yagi;Qiang Feng;Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing;Department of Mechanical,Materials,& Aerospace Engineering,Illinois Institute of Technology;National Center for Materials Service Safety,University of Science and Technology Beijing; 英文关键词：Superalloy;;Constant load creep;;Modified θ projection model;;Uniform deformation stage;;Prediction performance 中文刊名：CLKJ 英文刊名：材料科学技术(英文版) 机构：Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing;Department of Mechanical,Materials,& Aerospace Engineering,Illinois Institute of Technology;National Center for Materials Service Safety,University of Science and Technology Beijing; 出版日期：2019-04-15 出版单位：Journal of Materials Science & Technology 年：2019 期：v.35 基金：support provided by the National Key Research and Development Program of China (Grant No.2017YFB0702902);; the National Natural Science Foundation of China (Grant Nos.51631008 and 51771019);; the National High Technology Research Program of China (Grant No.2012AA03A513) as well as the 111 Project (No.B170003) 语种：英文; 页：CLKJ201904029 页数：8 CN：04 ISSN：21-1315/TG 分类号：225-232

摘要

To minimize the deviation of the predicted creep curves obtained under constant load conditions by the original θ projection model, a new modified version that can be expressed by ε = θ_1(1-e~(-θ2t)) +θ3 (e~(θ_4e~θ5~εt)-1), was derived and experimentally validated in our last study. In the present study, the predictive capability of the modified θ projection model was investigated by comparing the simulated and experimentally determined creep curves of K465 and DZ125 superalloys over a range of temperatures and stresses. Furthermore, the linear relationship between creep temperature and initial stress was extended to the 5-parameter model. The results indicated that the modified model could be used as a creep life prediction method, as it described the creep curve shape and resulted in predictions that fall within a specified error interval. Meanwhile, this modified model provides a more accurate way of describing creep curves under constant load conditions. The limitations and future direction of the modified model were also discussed. In addition, this modified θ projection model shows great potential for the evaluation and assessment of the service safety of structural materials used in components governed by creep deformation.
        To minimize the deviation of the predicted creep curves obtained under constant load conditions by the original θ projection model, a new modified version that can be expressed by ε = θ_1(1-e~(-θ2t)) +θ3 (e~(θ_4e~θ5~εt)-1), was derived and experimentally validated in our last study. In the present study, the predictive capability of the modified θ projection model was investigated by comparing the simulated and experimentally determined creep curves of K465 and DZ125 superalloys over a range of temperatures and stresses. Furthermore, the linear relationship between creep temperature and initial stress was extended to the 5-parameter model. The results indicated that the modified model could be used as a creep life prediction method, as it described the creep curve shape and resulted in predictions that fall within a specified error interval. Meanwhile, this modified model provides a more accurate way of describing creep curves under constant load conditions. The limitations and future direction of the modified model were also discussed. In addition, this modified θ projection model shows great potential for the evaluation and assessment of the service safety of structural materials used in components governed by creep deformation.

引文

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