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熱氫處理對MIM Ti-6Al-4V組織及性能的影響
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國家自然科學基金(51074070, 50674044)


Influences of Thermo-hydrogenation Treatment on the Microstructure and Properties of MIM Ti-6Al-4V Alloy
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    摘要:

    系統(tǒng)研究了熱氫處理過程中MIM Ti-6Al-4V相組成和顯微組織的演變規(guī)律，尤其是置氫量變化帶來的影響，以實現(xiàn)通過熱氫處理改善合金力學性能的目的。結(jié)果表明，在650 ℃置氫時，隨著置氫量的增加，首先合金中的β相增多，然后開始析出δ相氫化物，并形成越來越多的細小針狀組織。在850 ℃進行固溶和620 ℃進行等溫時效使得合金中的溶氫分布更均勻，δ相的析出更充分，針狀組織更加豐富。在720 ℃進行真空除氫處理后，合金的顯微組織保持了細小針狀組織的特征，并且置氫量越大時除氫后顯微組織的細化效果越顯著。置氫量為0.51%(質(zhì)量分數(shù), 下同)時MIM Ti-6Al-4V經(jīng)熱氫處理后極限抗拉強度、屈服強度和伸長率分別提高11%、13%和19%

    Abstract:

    Both the phase and microstructure evolution of MIM Ti-6Al-4V alloy in the thermo-hydrogenation treatment process were investigated, especially the effect of hydrogen content, to improve mechanical properties. The results show that β-Ti becomes more and more initially and then δ titanium hydride is precipitated as hydrogen content in the alloy increases during the hydrogenation process at 650 °C, so that the bulky sheets in the microstructure of as-MIMed alloy are gradually broken into tiny needles. Solution treatment at 850 °C and isothermal aging at 620 °C make the dissolved hydrogen in the alloy distribute more uniformly and let more needle-like δ precipitate. The alloy remains a refined needle-like microstructure after vacuum dehydrogenation at 720 °C, and the higher the dissolved hydrogen content in the hydrogenised alloy, the more the refined needle-like microstructure after dehydrogenation. For the alloy with 0.51wt% H after hydrogenation, its ultimate tensile strength, yield strength and elongation after dehydrogenation are increased by 11%, 13% and 19%, respectively, in comparison with those of MIM Ti-6Al-4V

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雷 豹,肖平安,周 威,張小虎,范安平.熱氫處理對MIM Ti-6Al-4V組織及性能的影響[J].稀有金屬材料與工程,2013,42(5):1057~1061.[Lei Bao, Xiao Ping’an, Zhou Wei, Zhang Xiaohu, Fan Anping. Influences of Thermo-hydrogenation Treatment on the Microstructure and Properties of MIM Ti-6Al-4V Alloy[J]. Rare Metal Materials and Engineering,2013,42(5):1057~1061.]
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  • 收稿日期:2012-05-05
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