Direct Observations of Sigma Phase Growth and Dissolution in 2205 Duplex Stainless Steel

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The formation and growth of sigma ({sigma}) 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, {sigma} 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 ({gamma}) volume fraction and a decrease in the ferrite ({delta}) volume fraction are observed. The {sigma} phase formed at this temperature is rapidly dissolved ... continued below

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Palmer, T; Elmer, J; Babu, S & Specht, E June 14, 2005.

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The formation and growth of sigma ({sigma}) 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, {sigma} 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 ({gamma}) volume fraction and a decrease in the ferrite ({delta}) volume fraction are observed. The {sigma} 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 {sigma} phase, the {delta} and {gamma} volume fractions both approach the balanced (50/50) level observed in the as-received material.

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PDF-file: 8 pages; size: 0.8 Mbytes

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  • Presented at: Trends in Welding Research, Pine Mountain, GA, United States, May 16 - May 20, 2005

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  • Report No.: UCRL-PROC-213031
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 877857
  • Archival Resource Key: ark:/67531/metadc873442

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  • June 14, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 10:53 a.m.

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Palmer, T; Elmer, J; Babu, S & Specht, E. Direct Observations of Sigma Phase Growth and Dissolution in 2205 Duplex Stainless Steel, article, June 14, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc873442/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.