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Study on the slope change in the larson-miller plot of 23Cr-26Ni-W austenitic heat-resistant steel

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Abstract

Tendency of creep-rupture life changes with stress variables in 23Cr-26Ni-W austenitic heat-resistant steel is studied in 175∼300 MPa range. It is found that the slope of Larson-Miller (LM) curve is suddenly changed in the applied stresses of 175∼200 MPa range at 700 °C. It is impossible to explain the complex response of creep-rupture lives to the applied stress with the conventional changing fracture-mode mechanism. In this research, the mechanism of the slope change in LM plot of 23Cr-26Ni-W austenitic heatresistant steel is elucidated by comparing and analyzing the microstructural changes before and after the stress insensitive phenomena.

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Authors and Affiliations

  1. Material Research Center, ILJIN Steel Co. Ltd, 466-1 Kwaerang-ri, Jungnam-myun, Hwasung-si Kyunggi-do, 445-963, Korea

    Young Min Lee

  2. Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, 136-713, Korea

    Sook In Kwun

  3. Interface Engineering Research Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 136-791, Korea

    Young Hoon Chung

Authors
  1. Young Min Lee
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  2. Sook In Kwun
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  3. Young Hoon Chung
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Correspondence to Young Hoon Chung.

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Lee, Y.M., Kwun, S.I. & Chung, Y.H. Study on the slope change in the larson-miller plot of 23Cr-26Ni-W austenitic heat-resistant steel. Met. Mater. Int. 20, 233–241 (2014). https://doi.org/10.1007/s12540-014-1020-2

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  • DOI: https://doi.org/10.1007/s12540-014-1020-2

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