混合控制条件下 TP321 不锈钢的蠕变-疲劳交互行为和损伤机理

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-11-05 DOI:10.1016/j.matchar.2024.114528

Chenwei Zhang , Shanghao Chen , Hongchang Wang , Fengping Zhong , Ling Li , Qiang Liu , Chong Zhen , Xujia Wang , Lijia Luo , Shiyi Bao

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引用次数: 0

摘要

本研究在多种试验条件下对 TP321 奥氏体不锈钢进行了混合控制蠕变疲劳（HCCF）试验。不仅详细分析了应变振幅、保持时间、保持应力和温度对 TP321 奥氏体不锈钢蠕变疲劳行为的影响，还揭示了蠕变疲劳损伤的交互机制。结果表明，试验温度和负载保持时间的增加会明显诱发蠕变变形，导致失效寿命显著缩短。此外，试验温度升高会导致循环硬化现象停止。其次，断口形貌分析和 X 射线计算机断层扫描（X-CT）结果表明，在蠕变-疲劳相互作用下，跨晶裂纹向内扩展并与晶间空隙相连，形成晶间和跨晶混合断裂模式。当蠕变损伤成为主要现象时，大蠕变空洞的存在阻碍了疲劳裂纹的扩展。随后，通过微观结构分析阐明了损伤演变机制，发现滑移带对三角晶界的影响和碳化物的析出促进了空洞的成核和晶间微裂纹的内部形成，从而导致蠕变-疲劳损伤相互作用。最后，结合断口形貌特征和显微组织，提出了 TP321 奥氏体不锈钢蠕变-疲劳损伤相互作用机理图。

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Creep-fatigue interactive behavior and damage mechanism of TP321 stainless steel under hybrid-controlled conditions

In this study, Hybrid-controlled creep-fatigue (HCCF) tests were conducted on TP321 austenitic stainless steel under a variety of test conditions. The effects of strain amplitude, holding time, holding stress and temperature on the creep-fatigue behavior of TP321 austenitic stainless steel were not only analyzed in detail but also revealed the creep-fatigue damage interactive mechanism. The results demonstrated that a rise in test temperature and load holding time markedly induced creep deformation, resulting in a notable reduction in failure life. Additionally, an increase in test temperature led to the cessation of the cyclic hardening phenomenon. Secondly, the analysis of fracture morphology and X-ray computed tomography (X-CT) scanning results demonstrated that the transgranular cracks expanded inwards and connected with the intergranular voids under creep-fatigue interaction, forming a mixed intergranular and transcrystalline fracture mode. The presence of large creep cavities impeded the propagation of fatigue cracks when creep damage was the dominant phenomenon. Subsequently, the damage evolution mechanism was elucidated through microstructural analysis, which revealed that the impact of the slip bands on the triangular grain boundaries and the precipitation of carbides facilitated the nucleation of voids and the internal formation of intergranular microcracks, thereby causing creep-fatigue damage interaction. Finally, the TP321 austenitic stainless steel creep-fatigue damage interactive mechanism diagram was proposed in conjunction with the fracture morphological characteristics and microstructure.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.