Investigation of the Kinetics of the Ferrite/Austenite Phase Transformation in the HAZ of a 2205 Duplex Stainless Steel Weldment

Todd Palmer, J. W. Elmer, Joe Wong, S. S. Babu, J. M. Vitek

Research output: Contribution to conferencePaper

4 Citations (Scopus)

Abstract

A semi-quantitative map based on a series of spatially resolved X-ray diffraction (SRXRD) scans shows the progression of the ferrite (δ)/austenite (γ) phase balance throughout the HAZ during GTA welding of a 2205 duplex stainless steel (DSS). This map shows a decrease in the ferrite volume fraction on heating, followed by a recovery to the original value on cooling at locations within the HAZ where no transformation is expected. Even though such behavior is supported by thermodynamic calculations, it has neither been confirmed by experimental methods nor have the transformation kinetics been evaluated over the time scales present during welding. Both Gleeble thermal simulations and time resolved x-ray diffraction (TRXRD) measurements on spot welds in the 2205 DSS have been performed, and both provide additional evidence for this transformation. In addition to the experimental work, calculations using both ortho-equilibrium and para-equilibrium interface conditions have been made to help explain this phase transformation. Only the para-equilibrium calculations have predicted the observed transformation on the same time scale as the SRXRD observations. Work is continuing in this area in order to determine the dominant mechanism of this phase transformation.

Original languageEnglish (US)
Pages23-28
Number of pages6
StatePublished - Dec 1 2002
EventTrends in Welding Research: Proceedings of the 6th International Conference - Phoenix, AZ, United States
Duration: Apr 15 2002Apr 19 2002

Other

OtherTrends in Welding Research: Proceedings of the 6th International Conference
CountryUnited States
CityPhoenix, AZ
Period4/15/024/19/02

Fingerprint

Stainless Steel
Austenite
Ferrite
Stainless steel
Phase transitions
Kinetics
Welding
X ray diffraction
Heat affected zone
Volume fraction
Welds
Diffraction
Thermodynamics
Cooling
Heating
Recovery
X rays

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanical Engineering

Cite this

Palmer, T., Elmer, J. W., Wong, J., Babu, S. S., & Vitek, J. M. (2002). Investigation of the Kinetics of the Ferrite/Austenite Phase Transformation in the HAZ of a 2205 Duplex Stainless Steel Weldment. 23-28. Paper presented at Trends in Welding Research: Proceedings of the 6th International Conference, Phoenix, AZ, United States.
Palmer, Todd ; Elmer, J. W. ; Wong, Joe ; Babu, S. S. ; Vitek, J. M. / Investigation of the Kinetics of the Ferrite/Austenite Phase Transformation in the HAZ of a 2205 Duplex Stainless Steel Weldment. Paper presented at Trends in Welding Research: Proceedings of the 6th International Conference, Phoenix, AZ, United States.6 p.
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abstract = "A semi-quantitative map based on a series of spatially resolved X-ray diffraction (SRXRD) scans shows the progression of the ferrite (δ)/austenite (γ) phase balance throughout the HAZ during GTA welding of a 2205 duplex stainless steel (DSS). This map shows a decrease in the ferrite volume fraction on heating, followed by a recovery to the original value on cooling at locations within the HAZ where no transformation is expected. Even though such behavior is supported by thermodynamic calculations, it has neither been confirmed by experimental methods nor have the transformation kinetics been evaluated over the time scales present during welding. Both Gleeble thermal simulations and time resolved x-ray diffraction (TRXRD) measurements on spot welds in the 2205 DSS have been performed, and both provide additional evidence for this transformation. In addition to the experimental work, calculations using both ortho-equilibrium and para-equilibrium interface conditions have been made to help explain this phase transformation. Only the para-equilibrium calculations have predicted the observed transformation on the same time scale as the SRXRD observations. Work is continuing in this area in order to determine the dominant mechanism of this phase transformation.",
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Palmer, T, Elmer, JW, Wong, J, Babu, SS & Vitek, JM 2002, 'Investigation of the Kinetics of the Ferrite/Austenite Phase Transformation in the HAZ of a 2205 Duplex Stainless Steel Weldment' Paper presented at Trends in Welding Research: Proceedings of the 6th International Conference, Phoenix, AZ, United States, 4/15/02 - 4/19/02, pp. 23-28.

Investigation of the Kinetics of the Ferrite/Austenite Phase Transformation in the HAZ of a 2205 Duplex Stainless Steel Weldment. / Palmer, Todd; Elmer, J. W.; Wong, Joe; Babu, S. S.; Vitek, J. M.

2002. 23-28 Paper presented at Trends in Welding Research: Proceedings of the 6th International Conference, Phoenix, AZ, United States.

Research output: Contribution to conferencePaper

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N2 - A semi-quantitative map based on a series of spatially resolved X-ray diffraction (SRXRD) scans shows the progression of the ferrite (δ)/austenite (γ) phase balance throughout the HAZ during GTA welding of a 2205 duplex stainless steel (DSS). This map shows a decrease in the ferrite volume fraction on heating, followed by a recovery to the original value on cooling at locations within the HAZ where no transformation is expected. Even though such behavior is supported by thermodynamic calculations, it has neither been confirmed by experimental methods nor have the transformation kinetics been evaluated over the time scales present during welding. Both Gleeble thermal simulations and time resolved x-ray diffraction (TRXRD) measurements on spot welds in the 2205 DSS have been performed, and both provide additional evidence for this transformation. In addition to the experimental work, calculations using both ortho-equilibrium and para-equilibrium interface conditions have been made to help explain this phase transformation. Only the para-equilibrium calculations have predicted the observed transformation on the same time scale as the SRXRD observations. Work is continuing in this area in order to determine the dominant mechanism of this phase transformation.

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Palmer T, Elmer JW, Wong J, Babu SS, Vitek JM. Investigation of the Kinetics of the Ferrite/Austenite Phase Transformation in the HAZ of a 2205 Duplex Stainless Steel Weldment. 2002. Paper presented at Trends in Welding Research: Proceedings of the 6th International Conference, Phoenix, AZ, United States.