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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Travel Speed on the Stress Corrosion Behavior of Friction Stir Welded 2024-T4 Aluminum Alloy
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Effect of Travel Speed on the Stress Corrosion Behavior of Friction Stir Welded 2024-T4 Aluminum Alloy

机译：移动速度对搅拌摩擦焊接2024-T4铝合金应力腐蚀行为的影响

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摘要

The effect of travel speed on stress corrosion cracking (SCC) behavior of friction stir welded 2024-T4 aluminum alloy was investigated by slow strain rate tensile test. Microstructure and microhardness of the welded joint were studied. The results showed that the size of second phase particles increased with increasing travel speed, and the distribution of second phase particles was much more homogeneous at lower travel speed. The minimum microhardness was located at the boundary of nugget zone and thermomechanically affected zone. In addition, the SCC susceptibility of the friction stir welded joint increased with the increase of travel speed, owing to the size and distribution of second phase particles in the welds. The anodic applied potentials of -700, -650, -600 mV, and cathodic applied potential of -1200 mV facilitated SCC while the cathodic applied potential of -1000 mV improved the SCC resistance. The SCC behavior was mainly controlled by the metal anodic dissolution at the open circuit potential, and hydrogen accelerated metal embrittlement.
机译：通过慢应变速率拉伸试验研究了行进速度对搅拌摩擦焊接2024-T4铝合金应力腐蚀开裂（SCC）行为的影响。研究了焊接接头的组织和显微硬度。结果表明，第二相粒子的尺寸随行进速度的增加而增大，第二相粒子的分布在较低的行进速度下更加均匀。最小显微硬度位于熔核区和热机械影响区的边界。另外，由于第二相颗粒在焊缝中的大小和分布，搅拌摩擦焊接接头的SCC敏感性随行进速度的增加而增加。 -700，-650，-600 mV的阳极施加电势和-1200 mV的阴极施加电势促进了SCC，而-1000 mV的阴极施加电势则改善了SCC电阻。 SCC行为主要受开路电位下的金属阳极溶解和氢加速金属脆化的控制。

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