Metals and Materials International

, Volume 20, Issue 2, pp 233–241 | Cite as

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.

Key words

alloys rolling precipitation SEM creep rupture 
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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Young Min Lee
    • 1
  • Sook In Kwun
    • 2
  • Young Hoon Chung
    • 3
  1. 1.Material Research CenterILJIN Steel Co. LtdHwasung-si Kyunggi-doKorea
  2. 2.Department of Materials Science and EngineeringKorea UniversitySeoulKorea
  3. 3.Interface Engineering Research CenterKorea Institute of Science and TechnologySeoulKorea

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