23C6碳化物"/> 23C6碳化物尺寸及含量有所增長,但未見明顯粗化；Laves相尺寸增長更明顯并在晶界處聚集,但未形成鏈狀。Laves相的析出長大與聚集是導致沖擊韌性下降的主要原因。研究結(jié)果認為630℃時效至5000 h FB2鋼能夠保持較高的高溫穩(wěn)定性。"/>

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超超臨界機組轉(zhuǎn)子FB2鋼630℃長期時效穩(wěn)定性研究
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北京科技大學

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國家自然科學基金資助(項目號51771016)


An Investigation on 630℃ Long-term Aging Stability for FB2 Rotor Steel Used in Ultra-Supercritical Units
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1.University of Science and Technology Beijing;2.China

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    摘要:

    本文以FB2轉(zhuǎn)子鋼為研究對象,利用沖擊實驗、硬度測試、掃描電鏡、透射電鏡及X射線衍射儀等測試方法研究了630℃長期時效中FB2轉(zhuǎn)子鋼組織和性能的變化,結(jié)果表明：隨著時效時間延長,沖擊功和硬度都呈下降趨勢,沖擊韌性在2000 h后下降較為明顯,后逐漸趨于穩(wěn)定。而硬度總體處在較高水平(253 HBW)。M23C6碳化物尺寸及含量有所增長,但未見明顯粗化；Laves相尺寸增長更明顯并在晶界處聚集,但未形成鏈狀。Laves相的析出長大與聚集是導致沖擊韌性下降的主要原因。研究結(jié)果認為630℃時效至5000 h FB2鋼能夠保持較高的高溫穩(wěn)定性。

    Abstract:

    In present work the 630℃ long-term aging stability of FB2 rotor steel are investigated by impact test, hardness test in combine with SEM, TEM and XRD analysis. The investigation shows that impact toughness and hardness decrease with proloning aging time. The impact ductility decreases apparently after 2000 h aging and then keeps stable. The hardness stays in a high level (253 HBW). The size and amount of M23C6 carbide increases slightly during aging without apparent coarsen. The size increase of Laves phase is more obvious and Laves phase tends to gather at grain boundary. While no chain of Laves phase is observed. The coarsen and gathering of Laves phase at grain boundary is the major reason for impact toughness degeneration. Bases on the research, it can be concluded that FB2 rotor steel keeps stable at 630℃ for up to 5000 h.

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姚漢新,江河,姚志浩,董建新.超超臨界機組轉(zhuǎn)子FB2鋼630℃長期時效穩(wěn)定性研究[J].稀有金屬材料與工程,2023,52(4):1536~1542.[Yao Hanxin, Jiang He, Yao Zhihao, Dong Jianxin. An Investigation on 630℃ Long-term Aging Stability for FB2 Rotor Steel Used in Ultra-Supercritical Units[J]. Rare Metal Materials and Engineering,2023,52(4):1536~1542.]
DOI：10.12442/j. issn.1002-185X.20220577

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  • 收稿日期:2022-07-11
  • 最后修改日期:2022-11-07
  • 錄用日期:2022-11-24
  • 在線發(fā)布日期: 2023-05-01
  • 出版日期: 2023-04-25