Applied Microscopy

  • 제43권4호
  • /
  • Pages.164-172
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  • 2013
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  • 2287-5123(pISSN)
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  • 2287-4445(eISSN)
한국현미경학회 (Korean Society of Microscopy)
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Microstructural Evolution of X20CrMoV12.1 Steel upon Short-term Creep Rupture Test

  • Hino, Mariko (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • He, Yinsheng (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Li, Kejian (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Chang, Jungchel (Power Generation Laboratory, Korea Electric Power Research Institute) ;
  • Shin, Keesam (School of Nano & Advanced Materials Engineering, Changwon National University)
  • 투고 : 2013.12.19
  • 심사 : 2013.12.26
  • 발행 : 2013.12.30
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초록

In this work, microstructural and hardness evolution of the X20 steel upon short-term creep test ($550^{\circ}C$ to $650^{\circ}C$, $180^{\circ}C$ to 60 MPa) was studied by using scanning electron microscope, electron backscattered diffraction, and transmission electron microscope, microhardness tester. After creep rupture, gauge and grip part of the specimens were microstructurally analyzed. Creep at the $650^{\circ}C$/60 MPa resulted in a rupture at 1,460 hours with growth of lath width from 1.31 to $2.87{\mu}m$ and a grain growth with a more equiaxed feature. There is a close relationship between Microhardness and lath width. The formation and coarsening of Laves phase, which was observed up to $600^{\circ}C$ of creep temperature, was accelerated by the applied stress. Slight coarsening of the $M_{23}C_6$ was observed in the $550^{\circ}C$ and $600^{\circ}C$ crept or aged specimens. The coarsening of $M_{23}C_6$ depended on the temperature, where specimens crept at $650^{\circ}C$ showed higher growth rate. The microstructural evolution of X20 after short-term creep test was extensively discussed in relation to the long-term creep/aging test reported in literatures.

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참고문헌

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피인용 문헌

  1. Cyclic behaviour of 12% Cr ferritic-martensitic steel upon long-term on-site service in power plants vol.39, pp.10, 2016, https://doi.org/10.1111/ffe.12421
  2. Microstructure Evolution and Stress Corrosion Cracking Susceptibility of 12Cr Martensitic Steel Upon Long-Term Service in Power Plants vol.28, pp.2, 2019, https://doi.org/10.1007/s11665-018-3840-6