Improved fatigue strength of Cr-electroplated 7075-T6 Al alloy by micro-shot peening

被引：18

作者：

Su, Chih-Hang ^{[1
]}

Chen, Tai-Cheng ^{[2
]}

Tsay, Leu-Wen ^{[1
]}

机构：

[1] Natl Taiwan Ocean Univ, Dept Optoelect & Mat Technol, Keelung 20224, Taiwan

[2] Inst Nucl Energy Res, Nucl Fuels & Mat Div, Taoyuan 32546, Taiwan

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 167卷

关键词：

7075 Al alloy; Electroplated Cr; Micro -shot peening; Fatigue strength; Residual stress; HARD CHROMIUM COATINGS; ALUMINUM-ALLOY; MICROSTRUCTURAL EVOLUTION; SURFACE-LAYER; STEEL; LIFE; 304-STAINLESS-STEEL; DEFORMATION; ENHANCEMENT; AIRCRAFT;

D O I：

10.1016/j.ijfatigue.2022.107354

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

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.

引用

页数：11

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