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U-2Nb合金等溫相轉(zhuǎn)變動(dòng)力學(xué)
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中國工程物理研究院材料研究所，四川 綿陽 621907

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基金項(xiàng)目:

國家自然科學(xué)基金青年項(xiàng)目(51901210, 21908210), “中國工程物理研究院創(chuàng)新發(fā)展基金” (CX20210008)


Kinetics of Isothermal Transformation of U-2Nb Alloy
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Affiliation:

Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, China

Fund Project:

National Natural Science Foundation of China (51901210, 21908210); CAEP Foundation (CX20210008)

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    摘要:

    討論了U-2Nb合金的等溫轉(zhuǎn)變動(dòng)力學(xué)行為。通過金相定量測(cè)量，構(gòu)建了其宏觀動(dòng)力學(xué)曲線，即時(shí)間-溫度-相轉(zhuǎn)變（TTT）曲線。對(duì)比之前在類似合金上的工作，發(fā)現(xiàn)了較大的差異。該差異主要?dú)w因于2種不同的相轉(zhuǎn)變機(jī)制，即單析出反應(yīng)和不連續(xù)析出反應(yīng)，它們分別在較高溫度（550~647 ℃）和較低溫度范圍（450~550 ℃）下發(fā)生。此外，討論了通過單析出反應(yīng)進(jìn)行的針狀α析出物在其長度方向上的生長速率。最后，運(yùn)用Zener-Hillert 模型模擬了單析出反應(yīng)受擴(kuò)散控制時(shí)的生長速率并與實(shí)驗(yàn)數(shù)據(jù)進(jìn)行了對(duì)比。

    Abstract:

    The isothermal transformation kinetics of U-2Nb alloy was investigated. Based on metallographic quantitative measurements, the general kinetics was presented with the time-temperature-transformation (TTT) diagram. Results show that considerable discrepancies are identified in comparison with previous work on similar alloys. The differences are mainly attributed to two different transformation mechanisms, namely the monotectoid and the discontinuous precipitation reactions, which are operated at higher (550~647 °C) and lower (450~550 °C) temperatures, respectively. In addition, the growth rate of the acicular α precipitate in its lengthening direction, which proceeds through monotectoid reaction, was discussed. Modeling of the lengthening rate was carried out with the Zener-Hillert model supposing a diffusion-controlled mechanism.

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尹嘉清,崔書山,莫文林,芮克強(qiáng),何世雄,陳冬,莫川,法濤.U-2Nb合金等溫相轉(zhuǎn)變動(dòng)力學(xué)[J].稀有金屬材料與工程,2022,51(12):4508~4518.[Yin Jiaqing, Cui Shushan, Mo Wenlin, Rui Keqiang, He Shixiong, Chen Dong, Mo Chuan, Fa Tao. Kinetics of Isothermal Transformation of U-2Nb Alloy[J]. Rare Metal Materials and Engineering,2022,51(12):4508~4518.]
DOI：10.12442/j. issn.1002-185X.20211151

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歷史
  • 收稿日期:2021-12-27
  • 最后修改日期:2022-11-24
  • 錄用日期:2022-03-07
  • 在線發(fā)布日期: 2023-01-11
  • 出版日期: 2022-12-30