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Journal of Materials Science

, Volume 43, Issue 15, pp 5350–5357 | Cite as

Influence of heat treatment on creep of a Mn–N stabilised austenitic stainless steel

  • A. Wisniewski
  • J. BeddoesEmail author
Article

Abstract

Creep at 700 °C/196 MPa and 900 or 925 °C/27.4 MPa of 21Cr–4Ni–9Mn austenitic stainless steel is determined as a function of the heat treatment. The heat treatment variation involves altering the solution heat treatment cooling rate from water quenching to cooling at 6 or 4 °C/min causing: serrated grain boundaries versus planar grain boundaries, coarser intergranular carbides, and discontinuous precipitation of grain boundary reaction zones. Water quenching causes improved creep resistance. Creep fracture and cracking is intergranular. Coarse intergranular carbides and grain boundary reaction zones cause premature void formation and cracking, this damage leading to an accelerating creep rate and lowering creep resistance of the more slowly cooled conditions. During creep, grain boundary serrations, which may otherwise contribute to improved creep, are eliminated. Determining the individual influence of grain boundary serrations on creep requires a detailed investigation of various heat treatment parameters to prevent concurrent formation of grain boundary reaction zones and serrations.

Keywords

Austenitic Stainless Steel Creep Property Solution Heat Treatment Intergranular Crack Rupture Life 

Notes

Acknowledgements

This research was funded by the Natural Sciences and Engineering Research Council of Canada through the Discovery grant program. Thanks are due to Crucible Specialty Metals, Syracuse, New York,for supply of the 21-4N bars.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Mechanical & Aerospace EngineeringCarleton UniversityOttawaCanada

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