A method and system for predicting creep fatigue behavior of martensitic heat-resistant steel

By establishing a creep fatigue prediction model based on microstructure, the problem of accuracy in predicting the creep fatigue performance of martensitic heat-resistant steel was solved, enabling performance evaluation of materials under extreme conditions and improving prediction accuracy.

CN116359035BActive Publication Date: 2026-03-10TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-11
Publication Date
2026-03-10

AI Technical Summary

Technical Problem

Existing technologies cannot effectively consider the microstructure evolution and micromechanism of martensitic heat-resistant steel during creep fatigue, resulting in inaccurate prediction of creep fatigue performance.

Method used

By collecting data on the microstructure evolution of copper-containing martensitic heat-resistant steel, calculating the cyclic strength change rate, creep rate, and dislocation density, and combining the elastic strain tensor, plastic strain tensor, and creep strain tensor, a creep fatigue prediction model based on the microstructure is established. Considering the dislocation multiplication and annihilation model, the creep fatigue behavior is predicted.

Benefits of technology

It improves the prediction accuracy of creep fatigue behavior of martensitic heat-resistant steel, reveals the influence of microstructure on creep fatigue performance, provides more accurate performance evaluation, and is applicable to material performance evaluation under extreme conditions.

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Abstract

This invention discloses a method and system for predicting the creep fatigue behavior of martensitic heat-resistant steel, relating to the field of high-temperature creep fatigue performance evaluation technology. The method includes: acquiring the microstructure evolution of copper-containing martensitic heat-resistant steel during the test process, obtaining the cyclic strength change rate based on the microstructure evolution, and calculating the creep rate of the copper-containing martensitic heat-resistant steel in the dislocation climb hard phase, as well as the dislocation density under cyclic loading conditions; based on the cyclic strength change rate, creep rate, and dislocation density, obtaining the elastic strain tensor, plastic strain tensor, and creep strain tensor of the copper-containing martensitic heat-resistant steel, and predicting the stress-strain evolution of the copper-containing martensitic heat-resistant steel under cyclic loading conditions based on the elastic modulus tensor; this invention overcomes the limitations of macroscopic creep fatigue behavior prediction methods and provides a new approach to revealing the influence of microstructure on creep fatigue performance.
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