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首页> 外文期刊>Materials express: an international journal on multidisciplinary materials research >Effect of shot peening on very high cycle fatigue of 2024-T351 aluminium alloy
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Effect of shot peening on very high cycle fatigue of 2024-T351 aluminium alloy

机译：喷丸对2024-T351铝合金非常高循环疲劳的影响

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摘要

To investigate the influence of shot peening (SP) on very high cycle fatigue (VHCF) performance of 2024-T351, the specimens with three surface conditions were performed under ultrasonic fatigue tests: mechanically-polished without peening (NP), ceramic shot peening (SP1), steel and glass mixed shot peening (SP2). The roughness, microhardness, residual stress, fractography measurement and scanning electron microscopy (SEM) were applied before fatigue test to characterize the effective layer induced by the peening treatment. For the failed specimens, the fracture surface were analysed using SEM to study the mechanisms of fatigue crack propagation. In addition, the fatigue life curve in ultra-high cycle region continuously decreased in the three series of specimens. However, the experimental results revealed that fatigue strength improvement resulting from shot peening treatment was negligible in very high cycle regime. Furthermore, the stress intensity factor for the surface crack initiation (SCI) and interior crack initiation (ICI) was discussed based on quantitative analysis on the fracture surface. The average values of Delta Kfish-eye for NP, SP1 and SP2 specimens are about 2.22, 1.48 and 1.61 MPa.M-1/2, respectively.
机译：为了探讨射击喷丸（SP）对2024-T351非常高的循环疲劳（VHCF）性能的影响，在超声疲劳试验下进行三种表面条件的标本：机械抛光而无需喷丸（NP），陶瓷射击喷丸（ SP1），钢和玻璃混合射击喷丸（SP2）。在疲劳试验之前施加粗糙度，微硬度，残余应力，断裂测量和扫描电子显微镜（SEM），以表征由喷丸处理引起的有效层。对于失效的标本，使用SEM分析裂缝表面，研究疲劳裂纹繁殖的机制。此外，在三个系列标本中，超高循环区域中的疲劳寿命曲线在连续下降。然而，实验结果表明，在非常高的循环状态下，由射击治疗造成的疲劳强度改善可忽略不计。此外，基于裂缝表面的定量分析讨论了表面裂纹引发（SCI）和内裂引起（ICI）的应力强度因子。 NP，SP1和SP2样本的Delta kthish-Eye的平均值分别为2.22,1.48和1.61MPa.m-1/2。

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