Nuclear Engineering and Technology

  • 제51권5호
  • /
  • Pages.1365-1372
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  • 2019
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Effects of Y and Ti addition on microstructure stability and tensile properties of reduced activation ferritic/martensitic steel

  • Qiu, Guoxing (State Key Laboratory of Rolling and Automation, Northeastern University) ;
  • Zhan, Dongping (School of Metallurgy, Northeastern University) ;
  • Li, Changsheng (State Key Laboratory of Rolling and Automation, Northeastern University) ;
  • Qi, Min (State Key Laboratory of Rolling and Automation, Northeastern University) ;
  • Jiang, Zhouhua (School of Metallurgy, Northeastern University) ;
  • Zhang, Huishu (School of Metallurgy Engineering, Liaoning Institute of Science and Technology)
  • 투고 : 2018.11.08
  • 심사 : 2019.03.04
  • 발행 : 2019.06.25
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초록

The effects of Y and Ti on the microstructure stability and tensile properties of the reduced activation ferritic/martensitic steel have been investigated. The addition of Y and Ti affected the prior austenite grain size due to the pinning of the inclusions. Ti addition of 0.008 wt% to the steel was intended to promote the precipitation of nano-sized carbides with a high resistance to coarsening. 8Ti14Y exhibited a higher yield strength and a lower DBTT than the other alloys due to the fine grain size and additional precipitation hardening by (Ti, Ta)-rich MX. After thermal exposure at $550^{\circ}C$ for 1500 h, yield strength was dropped significantly in exposed 0Ti13Y. On the contrary, a lower reduction of YS was observed in 8Ti14Y. The $M_{23}C_6$ in 0Ti13Y and 8Ti14Y and MX in 25Ti14Y and 39Ti15Y coarsened seriously during ageing, which could be responsible for the reduction of the tensile properties of alloys.

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참고문헌

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