期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 167, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2022.107354
关键词
7075 Al alloy; Electroplated Cr; Micro -shot peening; Fatigue strength; Residual stress
The effects of micro-shot peening (MSP) on the rotating bending fatigue resistance of Cr-electroplated AA 7075-T6 Al alloy were studied. MSP significantly increased the fatigue strength/life of 7075-T6 Al alloy with or without Cr-plating. The high resistance to fatigue crack growth of the MSP sample was attributed to the introduction of high residual compressive stress and the formation of a nanograined structure in the MSP zone.
The effects of micro-shot peening (MSP) on the rotating bending fatigue resistance of Cr-electroplated AA 7075-T6 Al alloy were investigated. Fe-based amorphous particles with sizes of 50-80 mu m were used as the shot balls and peened under 100 % surface coverage. The shot-peen intensity, determined by the height of the N-type Almen specimen, was 0.110 mm. The Cr-electroplated layer consisted of a network of microcracks in the as -plated condition. Without the necessity of micro-crack initiation, the Cr-electroplated substrate had the short-est fatigue life and lowest fatigue strength among the tested samples. MSP significantly increased the fatigue strength/life of 7075-T6 Al alloy with or without Cr-plating. The introduction of high residual compressive stress combined with the formation of a nanograined structure in the MSP zone was responsible for the high resistance to fatigue crack growth of the MSP sample.
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