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預(yù)時(shí)效工藝對Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe鈦合金組織與性能的影響
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1.內(nèi)蒙古工業(yè)大學(xué)材料科學(xué)與工程學(xué)院;2.西北有色金屬研究院

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國家自然科學(xué)基金青年基金(項(xiàng)目號516010990);內(nèi)蒙古自然科學(xué)基金(項(xiàng)目號2016BS0506);內(nèi)蒙古工業(yè)大學(xué)科學(xué)研究重點(diǎn)基金(項(xiàng)目號ZD201607); 內(nèi)蒙古自治區(qū)重大基礎(chǔ)研究開放課題


Effect of Pre Aging Microstructure on the Mechanical Properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe
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1.School of Materials Science and Engineering,Inner Mongolia University of Technology;2.Northwest Institute for Nonferrous Metal Research,Xi’an

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    摘要:

    對Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe鈦合金分別進(jìn)行單級和雙級時(shí)效熱處理,對比研究雙級時(shí)效工藝對高強(qiáng)β鈦合金組織與性能影響。單級時(shí)效溫度為550℃,雙級時(shí)效工藝采用在400℃預(yù)時(shí)效之后再進(jìn)行550℃下的再時(shí)效處理。研究結(jié)果表明,合金在400℃預(yù)時(shí)效時(shí)析出了ω相,隨著預(yù)時(shí)效時(shí)間的延長,ω相最終轉(zhuǎn)變?yōu)棣料唷Ｏ啾葐渭墪r(shí)效而言,合金經(jīng)雙級時(shí)效后其次生α相顯微組織得到明顯細(xì)化,其原因主要是因?yàn)轭A(yù)時(shí)效階段為后續(xù)較高溫度下次生α相的形核與長大提供了更多的形核質(zhì)點(diǎn)。雙級時(shí)效工藝可以大幅提高合金的強(qiáng)度及硬度,但是塑性略有下降。

    Abstract:

    The microstructure evolution and mechanical properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe alloy after single and duplex aging treatment were studied. The Single aging temperature was 550℃, the duplex aging was pre-aged at 400 ℃ then re-aged at 550℃. The results showed that when the alloy pre-aged at 400℃, the ω phase was precipitated. As the pre-aging time prolonged, the ω phase finally changed to the α phase. Duplex aging was effective to yield the α phase fine dispersion, and the pre precipitated isothermal ω phase provided more uniform nucleation position for precipitation of α phase than single aging so as to improve the alloy tensile strengthen greatly. During pre aging, the isothermal ω phase could precipitate sufficiently so as to provide more advantageous nucleation position to precipitate very fine α phase of acicular style, and the strengthening effect was the same with that of duplex aging.

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杜趙新,劉國龍,崔曉明,劉慧敏,程軍.預(yù)時(shí)效工藝對Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe鈦合金組織與性能的影響[J].稀有金屬材料與工程,2019,48(6):1904~1908.[Du Zhaoxin, Liu Guolong, Cui Xiaoming, Liu Huimin, Cheng Jun. Effect of Pre Aging Microstructure on the Mechanical Properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe[J]. Rare Metal Materials and Engineering,2019,48(6):1904~1908.]
DOI：10.12442/j. issn.1002-185X.20171113

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  • 收稿日期:2017-12-04
  • 最后修改日期:2018-02-03
  • 錄用日期:2018-05-08
  • 在線發(fā)布日期: 2019-07-30
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