Evaluation of the Creep Behavior of HP35Nb Heat Resistant Steel Using Finite Element Method

Document Type : Original Article

Authors

Department of Materials Engineering. Isfahan University of Technology, Isfahan, 84156-83111, Iran

Abstract

Prediction of creep behavior in heat-resistant alloys, especially under elevated stress and temperature conditions, is crucial for the design and optimization of industrial components. Significant risks and costs often arise from sudden damage and failure due to creep. Experimental tests for evaluation of creep behavior are time-consuming and expensive; thus, developing accurate numerical models for creep prediction is essential. The power law model and theta projection model are known as two widely-used methods. This study investigated the creep behavior of HP35Nb alloy under varying stress conditions and elevated temperatures through simulations using both power law and theta projection models. A comparison of the numerical results with experimental data was conducted to assess the accuracy of each model in predicting creep behavior. The findings showed that the theta projection model, due to its ability to represent all three stages of creep, aligned more closely with the experimental data and was identified as a suitable choice for predicting the long-term creep. This model was able to estimate rupture time with minimal discrepancy compared to the experimental results, and displayed consistent performance under both high and low stresses. In contrast, the power law model demonstrated high accuracy during the initial and secondary stages of creep, but its predicted strains were lower than the experimental values in the tertiary stage. Moreover, at elevated stresses, the power law model exhibited significant deviation from the experimental data, while its predictions were more accurate at lower stresses.

Keywords

Main Subjects

References

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