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Nb對(duì)鈉冷快堆包殼用15-15Ti奧氏體不銹鋼組織和拉伸性能的影響
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1.東北大學(xué) 材料科學(xué)與工程學(xué)院;2.中國(guó)科學(xué)院金屬研究所 核用材料與安全評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室;3.中國(guó)原子能科學(xué)研究院;4.中國(guó)科學(xué)院核用材料與安全評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室中國(guó)科學(xué)院金屬研究所

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Effect of niobium content on the microstructure and tensile properties of 15Cr-15Ni Titanium-modified Austenitic Stainless Steel used as core components in liquid metal-cooled fast reactors (LMFR).
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    摘要:

    使用OM、SEM和TEM等方法研究了0~0.46wt.%Nb對(duì)固溶態(tài)和時(shí)效態(tài)15Cr-15Ni含Ti奧氏體不銹鋼(15-15Ti)中析出相類型、形貌及其分布的影響。結(jié)果表明,Nb取代了(Ti,Mo)C相中部分Ti、Mo原子,在0.21wt.%Nb和0.46wt.%Nb合金中形成富Nb的(Nb,Ti)C相,而且Nb含量的增加使固溶態(tài)的奧氏體基體組織細(xì)化。在850 ℃時(shí)效1000h后,組織中有sigma相、MC碳化物析出,Nb的增加促進(jìn)了 Nb、Mo元素在sigma相中的富集,促使sigma相更為細(xì)小、彌散析出。固溶態(tài)和時(shí)效態(tài)試樣的室溫、650 ℃拉伸結(jié)果表明,在0~0.46 wt.% Nb范圍內(nèi),Nb含量的增加對(duì)固溶態(tài)合金室溫和高溫拉伸性能影響較小,而Nb促進(jìn)析出的sigma相對(duì)時(shí)效態(tài)合金的拉伸性能影響較小。

    Abstract:

    This study investigated the precipitated phases of Titanium-stabilized 15Cr-15Ni austenitic stainless steel with different niobium contents (0-0.46 wt.%), in which the types, morphology and distribution of precipitated phases after solution treatment and aging treatment were characterized by means of OM, SEM, and TEM. Results show that Ti and Mo can be partly replaced with Nb in (Ti,Mo)C phase to form a Nb-rich (Nb,Ti)C phase in 0.21wt.%Nb and 0.46wt.%Nb alloys. What’s more , the increase of Nb content refines austenite matrix structure after solution treatment. In addition , the main phases in the alloy after aging at 850℃ for 1000h are sigma and MC carbides .the increase of Nb content not only promotes to enrich Nb and Mo elements in the sigma phases, but also furthers it to be finer and dispersed. Besides, in the range of 0-0.46wt.%Nb, the tensile results of solution and aged specimens at room temperature and 650℃ show that the increase of Nb content has little effect on the tensile properties of the solution alloy at room temperature and high temperature, while the sigma promoted by Nb has no effect on the tensile properties of the aged alloy.

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喬羽飛,陳思含,任媛媛,梁田,劉春明,馬穎澈,劉奎. Nb對(duì)鈉冷快堆包殼用15-15Ti奧氏體不銹鋼組織和拉伸性能的影響[J].稀有金屬材料與工程,2021,50(11):4079~4088.[Yufei Qiao, Sihan Chen, Yuanyuan Ren, Tian Liang, Chunming Liu, Yinche Ma, Kui Liu. Effect of niobium content on the microstructure and tensile properties of 15Cr-15Ni Titanium-modified Austenitic Stainless Steel used as core components in liquid metal-cooled fast reactors (LMFR).[J]. Rare Metal Materials and Engineering,2021,50(11):4079~4088.]
DOI：10.12442/j. issn.1002-185X.20200900

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  • 收稿日期:2020-11-22
  • 最后修改日期:2020-12-14
  • 錄用日期:2020-12-23
  • 在線發(fā)布日期: 2021-11-30
  • 出版日期: 2021-11-24