预应变对TWIP1000钢低周疲劳性能的影响

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-08-14 DOI:10.1016/j.ijfatigue.2025.109241

Weikun Wang, Wenhao Li, Zhi Yang, Qing Xu, Zijie Yan, Mei Zhang

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引用次数: 0

摘要

对孪生诱导塑性（TWIP1000）钢在预应变率为0%、预应变率为30%和60%时的低周疲劳行为进行了分析。通过x射线衍射、扫描电镜和透射电镜对预应变和循环加载过程中的微观组织演变进行了表征。结果表明，预应变通过变形孪晶细化了组织，通过位错倍增和动态Hall-Petch效应提高了材料的强度。当应变幅值≤0.6%时，预应变改善了LCF性能，但当应变幅值高于0.8%时，预应变反而降低了疲劳寿命。位错运动的阻碍、动态Hall-Petch效应和预应变引起的交叉滑移抑制有效地抑制了循环软化。预应变通过延缓裂纹萌生和阻碍裂纹扩展来改善LCF性能。结果表明，变形孪晶通过减缓塑性损伤累积而延缓裂纹萌生。预应变使疲劳条纹间距从0.334 μm减小到0.197 μm，表明预应变有效地降低了疲劳裂纹扩展速率。这是由于变形孪晶的阻碍和偏转作用造成的。

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Effect of pre-straining on the low-cycle fatigue performance of TWIP1000 steel

The low cycle fatigue (LCF) behavior of twinning induced plasticity (TWIP1000) steels was analyzed in its as-received (AR: 0 % pre-strained) and pre-strained conditions of 30 % and 60 %. The microstructural evolution during pre-straining and cyclic loading was characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Results indicated that pre-straining refined the microstructure via deformation twinning and enhanced the strength of the material through dislocation multiplication and the dynamic Hall-Petch effect. Pre-straining improved LCF property at strain amplitudes ≤ 0.6 %, but reduced fatigue life adversely at a higher strain amplitude of 0.8 %. The hindrance of dislocation movement, dynamic Hall-Petch effect and the suppression of cross slip caused by pre-straining effectively suppress cyclic softening. Pre-straining improves LCF performance by delaying crack initiation and impeding crack propagation. It is revealed that deformation twins delay crack initiation by mitigating plastic damage accumulation. Pre-straining decreased the fatigue striation spacing from 0.334 μm to 0.197 μm, indicating that pre-straining effectively reduces the fatigue crack propagation rate. It is attributed to the obstruction and deflection effects of deformation twins.

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.