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首页> 外文期刊>Journal of Materials Engineering and Performance >Very High-Cycle Fatigue Properties and Residual Stress Relaxation of Micro-shot-Peened EA4T Axle Steel
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Very High-Cycle Fatigue Properties and Residual Stress Relaxation of Micro-shot-Peened EA4T Axle Steel

机译：微射击喷丸EA4T轴钢的非常高循环疲劳性能和残余应力松弛

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摘要

In this paper, EA4T alloy railway axle steel was shot peened with steel balls and ceramic balls with a diameter of 50 mu m, and 10(9)-cycle fatigue tests of unpeened and peened specimens were carried out. The fatigue properties and the surface compression residual stress relaxation processes were investigated. The results of surface fracture observation indicated that all the cracks initiated from the surface, and both peened and unpeened specimens have conventional fatigue limits in the very high-cycle fatigue regime. Moreover, compared with unpeened (UP) specimens, the fatigue limits were improved by 31 and 28% for ceramic shot-peened (CSP) and steel shot-peened (SSP) specimens, respectively. The improvement of fatigue limit is related to the surface compressive residual stresses (SCRS) and the surface-hardened layer. The SCRS and full-width half-maximum (FWHM) values during the relaxation processes have been analyzed. At stress amplitudes lower than the cyclic yield strength, the residual stress of SSP specimens relaxed quickly in the first loading cycle and then remained stable, while the residual stress of CSP specimens relaxed quickly in the first loading cycle and relaxed slowly afterward, then remained stable. For all SSP and CSP specimens with applied stress amplitudes larger than the cyclic yield strength, the residual stress relaxed quickly in the initial cycles, and then remained stable after the first loading cycle.
机译：本文用钢球和直径为50μm的陶瓷球喷射了EA4T合金铁路轴钢，并进行了10（9）个循环试样的10（9）条疲劳试验。研究了疲劳性能和表面压缩残余应力松弛方法。表面骨折观察结果表明，从表面发起的所有裂缝，以及喷丸和未拆分的标本都具有常规疲劳限制在非常高的疲劳方案中。此外，与未分散的（上）标本相比，陶瓷射击喷丸（CSP）和钢喷丸（SSP）样本的疲劳限制分别提高了31％和28％。疲劳极限的提高与表面压缩残余应力（SCR）和表面硬化层有关。分析了在放松过程中的SCR和全宽半最大（FWHM）值。在低于循环屈服强度的应力幅度下，在第一装载循环中快速缓解SSP样品的残余应力，然后保持稳定，而CSP标本的残余应力在第一装载循环中迅速松弛，然后慢慢放松，然后保持稳定。对于所有SSP和CSP样本具有大于循环屈服强度的施加应力振幅，在初始循环中快速松弛的残余应力，然后在第一装载循环后保持稳定。

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