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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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    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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[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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History
  • Received:November 22,2020
  • Revised:December 14,2020
  • Adopted:December 23,2020
  • Online: November 30,2021
  • Published: November 24,2021