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    低能电磁冲击对TC11钛合金显微组织和冲击韧性的影响

    Influence of Low-Energy Electromagnetic Shocking on Microstructure and Impact Toughness of TC11 Titanium Alloy

    • 摘要: 采用低能电磁冲击对锻态网篮组织TC11钛合金进行处理,冲击过程中试样表面最高温度不超过200 ℃,研究了低能电磁冲击过程中显微组织和冲击韧性的演变。结果表明:低能电磁冲击使TC11钛合金发生一定程度的相变,随着低能电磁冲击时间的延长,β相占比先增大后减小,α相致密程度先降低后升高,冲击吸收能量先增大后减小,当冲击时间超过0.88 s后,冲击吸收能量低于未冲击试验合金。当低能电磁冲击时间为0.44 s时,试验合金的冲击韧性最好,冲击吸收能量为170.5 J,相比于未冲击试验合金提升约14.1%;冲击韧性的提高与β相含量的增加、α/β相界面处产生的中间相层和局部球化有关。

       

      Abstract: The forged TC11 titanium alloy with a basket-weave microstructure was treated by low-energy electromagnetic shocking. The maximum surface temperature of the specimen during the shocking was no more than 200 ℃. The evolution of the microstructure and the impact toughness during low-energy electromagnetic shocking was investigated. The results show that low-energy electromagnetic shocking promoted a certain degree of phase transformation in TC11 titanium alloy. With the extension of low-energy electromagnetic shocking time, the proportion of β phase first increased and then decreased, the compactness of α phase first decreased and then increased, and the impact absorption energy first increased and then decreased. When the shocking time exceeded 0.88 s, the impact absorption energy was lower than that of the unshocked test alloy. When the low-energy electromagnetic shocking time was 0.44 s, the impact toughness of the test alloy was the best, with an impact absorption energy of 170.5 J, which was about 14.1% higher than that of the unshocked test alloy. The improvement in impact toughness was related to the increase in β phase content, the formation of intermediate phase layers at the α/β phase boundary, and the local spheroidization.

       

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