Direct observations of sigma phase growth and dissolution in 2205 duplex stainless steel

Todd Palmer, J. W. Elmer, S. S. Babu, E. D. Specht

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The formation and growth of sigma (σ) phase in a 2205 duplex stainless steel is monitored during an 850°C isothermal heat treatment using an in situ synchrotron x-ray diffraction technique. At this temperature, σ phase is first observed within approximately 40 seconds of the start of the isothermal heat treatment and grows rapidly over the course of the 3600 second heat treatment to a volume fraction of approximately 13%. A simultaneous increase in the austenite (γ) volume fraction and a decrease in the ferrite (δ) volume fraction are observed. The σ phase formed at this temperature is rapidly dissolved within approximately 200 seconds when the temperature is increased to 1000°C. Accompanying this rapid dissolution of the σ phase, the δ and γ volume fractions both approach the balanced (50/50) level observed in the as-received material.

Original languageEnglish (US)
Title of host publicationTrends in Welding Research - Proceedings of the 7th International Conference
Pages945-950
Number of pages6
StatePublished - Dec 1 2005
Event7th International Conference on Trends in Welding Research - Pine Mountain, GA, United States
Duration: May 16 2005May 20 2005

Publication series

NameASM Proceedings of the International Conference: Trends in Welding Research
Volume2005

Other

Other7th International Conference on Trends in Welding Research
CountryUnited States
CityPine Mountain, GA
Period5/16/055/20/05

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanical Engineering

Cite this

Palmer, T., Elmer, J. W., Babu, S. S., & Specht, E. D. (2005). Direct observations of sigma phase growth and dissolution in 2205 duplex stainless steel. In Trends in Welding Research - Proceedings of the 7th International Conference (pp. 945-950). (ASM Proceedings of the International Conference: Trends in Welding Research; Vol. 2005).