Direct Observations of Sigma Phase Growth and Dissolution in 2205 Duplex Stainless Steel
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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 877857
- Report Number(s):
- UCRL-PROC-213031; TRN: US0601643
- Resource Relation:
- Conference: Presented at: Trends in Welding Research, Pine Mountain, GA, United States, May 16 - May 20, 2005
- Country of Publication:
- United States
- Language:
- English
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Synchrotron Based Observations of Sigma Phase Formation and Dissolution in Duplex Stainless Steel
Synchrotron Based Observations of Sigma Phase Formation and Dissolution in Duplex Stainless Steel