Research on the internal and external synergistic strengthening mechanism of fatigue performance of austenitic stainless steel

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-03-22 DOI:10.1016/j.ijfatigue.2025.108948

Qingfan Xie , Hongxia Zhang , Shubang Wang , Zhifeng Yan

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Abstract

In this study, the effects of the synergy between pre-tensioning and surface mechanical rolling on the microstructure and fatigue performance of 304 stainless steel were discussed. The 304 stainless steel was subjected to pre-tensioning treatment, and a transformation in the microstructure was observed, with refinement of the grain size accompanied by the occurrence of martensitic transformation, and a quantitative analysis of the martensitic phase change was conducted. The yield strength of 304 stainless steel rises with pre-tensioning, equalizing with tensile strength after 50 % pre-tensioning. The hardness of the specimen was increased after pre-tensioning. After surface mechanical rolling, the hardness values exhibited a gradation decreasing progressively from the surface to the subsurface and then to the center. Based on the rotating bending fatigue test, under the combined effects of 50 % pre-tensioning and surface mechanical rolling, the fatigue limit of the specimen was increased from 365 MPa to 940 MPa, representing an improvement of 157.53 %. Based on the analysis of the properties and microstructure of processed 304 stainless steel, the effects of the pre-tensioning process and surface mechanical rolling on the material are discussed. The mechanism of the process enhancing fatigue properties through the combined effect of pre-tensioning and surface mechanical rolling is discussed.

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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.