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Effect of grain size on creep properties of type 316LN stainless steel

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Abstract

The effect of grain size on creep properties of type 316LN stainless steel has been investigated at 600°C under different stresses. The initial strain at the beginning of creep tests decreased with the decrease of grain size. This was confirmed by the Hall-Petch relationship. The steady state creep rate decreased to a minimum value at the intermediate grain size (dm=80–130 μm) and then increased with the further increase of grain size. This result agreed with Garofalo's model stating that grain boundaries act simultaneously as both dislocation sources and barriers to dislocation movement. The rupture elongation at the intermediate grain size was minimal due to the cavity formed easily by carbide precipitates in the grain boundaries.

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Authors and Affiliations

  1. Division of Material Science and Engineering, Korea Univeristy, 1, 5Ka, Anam-dong Sungbuk-ku, 136-701, Seoul, Korea

    Yo Seob Lee & Dok Yol Lee

  2. Korea Atomic Energy Research Institute, 150 Duckjin-dong, Yusong-ku, 305-353, Taejon, Korea

    Dae Whan Kim & Woo Seog Ryu

Authors
  1. Yo Seob Lee
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  2. Dae Whan Kim
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  3. Dok Yol Lee
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  4. Woo Seog Ryu
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Lee, Y.S., Kim, D.W., Lee, D.Y. et al. Effect of grain size on creep properties of type 316LN stainless steel. Met. Mater. Int. 7, 107–114 (2001). https://doi.org/10.1007/BF03026948

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