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700℃超超臨界鍋爐管用617B合金時效組織演變
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北京科技大學

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TG146.1 5

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國家高技術(shù)研究發(fā)展計劃（863計劃）


Microstructure Evolution During Aging of Alloy 617B for 700 ℃ Ultra-Supercritical Boiler Pipe
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University of Science & Technology Beijing

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    摘要:

    電站用合金的高溫長期時效組織穩(wěn)定性對合金的選材以及電站安全至關(guān)重要，本文詳細研究了700℃超超臨界鍋爐管用617B合金在720 ℃/10000 h、800 ℃/2000 h和850 ℃/100 h時效和不同溫度50 h時效過程中組織穩(wěn)定性及力學性能變化。研究表明：617B合金在10,000 h長期時效末期組織穩(wěn)定性較差，γ?相粗化且晶界上有有害相析出；溫度對617B合金的組織穩(wěn)定性影響較大，隨著溫度升高γ?相急劇粗化，晶內(nèi)析出相發(fā)生轉(zhuǎn)變；合金的硬度主要受γ?相析出規(guī)律的影響；720 ℃時效過程中晶內(nèi)有拉鏈狀析出相，其種類、結(jié)構(gòu)有待進一步研究。

    Abstract:

    The microstructure stability during high temperature long-term aging of material for power plants is critical for the material choice and safety of power plants. In this paper the microstructure stability and mechanical properties of alloy 617B after 720 ℃/10000 h, 800 ℃/2000 h and 850 ℃/100 h aging and short term aging at different temperature are studied. The results show that the microstructure stability of alloy 617B after aging at 720 ℃ for 10,000 is relatively poor, γ? phase coarsens and harmful phase precipitates on grain boundary. Aging temperature has important influence on the microstructure stability of alloy 617B as γ? phase coarsened rapidly with the increasing of aging temperature and the intragranular precipitates transferred. The hardness of alloy 617B is mainly influenced by the precipitation rule of γ? phase. There are zipper-like precipitates in grain during 720 ℃ aging while the structure of phase needs further study.

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江河.700℃超超臨界鍋爐管用617B合金時效組織演變[J].稀有金屬材料與工程,2016,45(4):982~989.[jianghe. Microstructure Evolution During Aging of Alloy 617B for 700 ℃ Ultra-Supercritical Boiler Pipe[J]. Rare Metal Materials and Engineering,2016,45(4):982~989.]
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  • 收稿日期:2014-04-28
  • 最后修改日期:2014-05-12
  • 錄用日期:2014-07-01
  • 在線發(fā)布日期: 2016-06-02
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