Fatigue and ratcheting behaviour of CuCrZr alloy under asymmetric cyclic load at high temperature

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2025-04-12 DOI:10.1016/j.fusengdes.2025.115044

Rui Zhang , Jian Peng , Jiacheng Gu , Tianci Xue , Qian Zhang , Xueru Zhu

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Abstract

CuCrZr alloy often operates at high temperature and cyclic loading conditions, and its high temperature fatigue behaviour is of great significance for ensuring the service safety of copper alloy equipment. In this paper, the influences of temperature and stress amplitude on the interaction between ratcheting and fatigue of CuCrZr at high temperature is studied through asymmetric cyclic engineering stress-controlled fatigue experiments. It is found that there are two competing failure modes in CuCrZr, namely, ductile failure caused by ratcheting strain under high-stress cyclic loading and crack propagation failure caused by fatigue damage under low-stress cyclic loading. With the increase of cyclic stress amplitude and temperature, the failure mechanism of CuCrZr changes from fatigue crack propagation failure to ratcheting ductile failure, revealing the critical transformation temperature and transformation fatigue load. Finally, the stress-based and energy-based fatigue life prediction models are established for CuCrZr alloy at high temperatures, which are verified by experimental data. This study provides the fatigue and ratcheting property data for the application of CuCrZr in the high temperature fatigue conditions, to support the structural integrity of copper alloy equipment at high temperature.

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高温非对称循环载荷下CuCrZr合金的疲劳和棘轮行为

CuCrZr 合金经常在高温和循环载荷条件下工作，其高温疲劳行为对确保铜合金设备的服役安全具有重要意义。本文通过非对称循环工程应力控制疲劳实验，研究了温度和应力振幅对 CuCrZr 高温下棘轮和疲劳之间相互作用的影响。研究发现，CuCrZr 存在两种相互竞争的失效模式，即在高应力循环加载下由棘轮应变引起的韧性失效和在低应力循环加载下由疲劳损伤引起的裂纹扩展失效。随着循环应力振幅和温度的增加，CuCrZr 的破坏机理由疲劳裂纹扩展破坏转变为棘轮韧性破坏，揭示了临界转变温度和转变疲劳载荷。最后，建立了高温下 CuCrZr 合金基于应力和基于能量的疲劳寿命预测模型，并通过实验数据进行了验证。本研究为 CuCrZr 在高温疲劳条件下的应用提供了疲劳和棘变性能数据，为铜合金设备在高温条件下的结构完整性提供了支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.