HIGH-TEMPERATURE LOW-CYCLE FATIGUE BEHAVIOR AND CRACK INITIATION LIFE PREDICTION OF P91 STEEL BASED ON CRYSTAL PLASTICITY THEORY

被引：0

作者：

Tengfei, Li ^{[1
]}

Dongming, Li ^{[2
]}

Ziguang, Chen ^{[3
]}

Wenshan, Yu ^{[4
]}

Qianhua, Kan ^{[1
]}

Xu, Zhang ^{[1
]}

机构：

[1] Advanced Structural Material Mechanics and Service Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu

[2] Dongfang (Guangzhou) Heavy Machinery Co., Ltd., Guangzhou

[3] Department of Engineering Mechanics, School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan

[4] State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an

来源：

Lixue Xuebao/Chinese Journal of Theoretical and Applied Mechanics | 2025年 / 57卷 / 05期

关键词：

crystal plasticity theory; cyclic softening; life prediction; martensitic lath coarsening; P91; steel;

D O I：

10.6052/0459-1879-25-009

中图分类号：

学科分类号：

摘要：

P91 steel is widely utilized in critical structural components due to its outstanding performance in high-temperature environments. However, its cyclic softening behavior and the initiation mechanisms of fatigue cracks are not yet fully understood, which hinders the reliability design and lifespan prediction of the material. In this context, the present study proposes a crystal plasticity-based constitutive model grounded in physical mechanisms. The model systematically accounts for the evolution of back stress, martensitic lath coarsening, and dislocation glide/climb mechanisms, and is implemented using the finite element method. The simulation results effectively replicate the experimental observations of P91 steel under high-temperature cycling, thereby validating the accuracy and applicability of the model. The findings indicate that the cyclic softening behavior of P91 steel at elevated temperatures is primarily driven by microstructural recovery processes, including martensitic lath coarsening and a reduction in dislocation density. Fatigue cracks are observed to preferentially initiate at grain boundaries or triple-junctions. The crack initiation life is predicted using two fatigue indicator parameters (FIPs): accumulated plastic slip and accumulated energy dissipation. The results demonstrate that both FIPs exhibit strong predictive capability, with all predicted data points falling within the two-fold error band. Under high strain amplitude conditions, the fatigue life prediction based on accumulated energy dissipation provides higher accuracy, underscoring its potential for application in high-temperature fatigue behavior research. This study provides a comprehensive scientific foundation for understanding the cyclic plasticity behavior and fatigue crack initiation mechanisms in P91 steel, and offers a robust methodological framework for the reliability design of high-temperature materials. © 2025 Chinese Society of Theoretical and Applied Mechanics. All rights reserved.

引用

页码：1160 / 1173

页数：13

共 57 条

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