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

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（4）
• 页码范围: 687-694
• 页数: 8页
• 语种: 英文

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 e =θ1 (1-e-θ2t) + θ3 (eθ4eθ5εt-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.