Characterization of low temperature ferrite/austenite transformations in the heat affected zone of 2205 duplex stainless steel arc welds

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

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

1 Citation (Scopus)

Abstract

Spatially Resolved X-Ray Diffraction (SRXRD) has been used to identify a previously unobserved low temperature ferrite (δ)/austenite(γ) phase transformation in the heat affected zone (HAZ) of 2205 Duplex Stainless Steel (DSS) welds. In this "ferrite dip" transformation, the ferrite transforms to austenite in the weld HAZ at peak temperatures on the order of 750°C. The austenite then re-transforms to ferrite during cooling, resulting in a ferrite volume fraction equivalent to that in the base metal. Time Resolved X-Ray Diffraction (TRXRD) and laser dilatometry measurements during Gleeble® thermal simulations are performed here in order to confirm the existence of this low temperature phase transformation. Experimental results, combined with thermodynamic and kinetic modeling of interstitial diffusion, have been used to investigate the mechanisms driving the "ferrite dip" transformation. These results indicate that the formation and decomposition of secondary austenite during heating and cooling, respectively, is most likely responsible for this observed behavior.

Original languageEnglish (US)
Title of host publicationA Symposium on the Thermodynamics, kinetics, Characterizaion and Modeling of: Austenite Formation and Decomposition
EditorsE.B. Damm, M.J. Merwin
Pages177-192
Number of pages16
StatePublished - 2003
EventMaterials Science and Technology 2003 Meeting - Chicago, IL, United States
Duration: Nov 9 2003Nov 12 2003

Other

OtherMaterials Science and Technology 2003 Meeting
CountryUnited States
CityChicago, IL
Period11/9/0311/12/03

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Stainless Steel
Heat affected zone
Austenite
Ferrite
Welds
Stainless steel
Temperature
Phase transitions
X ray lasers
Cooling
X ray diffraction
Volume fraction
Metals
Mathematical transformations
Thermodynamics
Decomposition
Heating
Kinetics

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Palmer, T., Elmer, J. W., Babu, S. S., & Vitek, J. M. (2003). Characterization of low temperature ferrite/austenite transformations in the heat affected zone of 2205 duplex stainless steel arc welds. In E. B. Damm, & M. J. Merwin (Eds.), A Symposium on the Thermodynamics, kinetics, Characterizaion and Modeling of: Austenite Formation and Decomposition (pp. 177-192)
Palmer, Todd ; Elmer, J. W. ; Babu, S. S. ; Vitek, J. M. / Characterization of low temperature ferrite/austenite transformations in the heat affected zone of 2205 duplex stainless steel arc welds. A Symposium on the Thermodynamics, kinetics, Characterizaion and Modeling of: Austenite Formation and Decomposition. editor / E.B. Damm ; M.J. Merwin. 2003. pp. 177-192
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abstract = "Spatially Resolved X-Ray Diffraction (SRXRD) has been used to identify a previously unobserved low temperature ferrite (δ)/austenite(γ) phase transformation in the heat affected zone (HAZ) of 2205 Duplex Stainless Steel (DSS) welds. In this {"}ferrite dip{"} transformation, the ferrite transforms to austenite in the weld HAZ at peak temperatures on the order of 750°C. The austenite then re-transforms to ferrite during cooling, resulting in a ferrite volume fraction equivalent to that in the base metal. Time Resolved X-Ray Diffraction (TRXRD) and laser dilatometry measurements during Gleeble{\circledR} thermal simulations are performed here in order to confirm the existence of this low temperature phase transformation. Experimental results, combined with thermodynamic and kinetic modeling of interstitial diffusion, have been used to investigate the mechanisms driving the {"}ferrite dip{"} transformation. These results indicate that the formation and decomposition of secondary austenite during heating and cooling, respectively, is most likely responsible for this observed behavior.",
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Palmer, T, Elmer, JW, Babu, SS & Vitek, JM 2003, Characterization of low temperature ferrite/austenite transformations in the heat affected zone of 2205 duplex stainless steel arc welds. in EB Damm & MJ Merwin (eds), A Symposium on the Thermodynamics, kinetics, Characterizaion and Modeling of: Austenite Formation and Decomposition. pp. 177-192, Materials Science and Technology 2003 Meeting, Chicago, IL, United States, 11/9/03.

Characterization of low temperature ferrite/austenite transformations in the heat affected zone of 2205 duplex stainless steel arc welds. / Palmer, Todd; Elmer, J. W.; Babu, S. S.; Vitek, J. M.

A Symposium on the Thermodynamics, kinetics, Characterizaion and Modeling of: Austenite Formation and Decomposition. ed. / E.B. Damm; M.J. Merwin. 2003. p. 177-192.

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

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Palmer T, Elmer JW, Babu SS, Vitek JM. Characterization of low temperature ferrite/austenite transformations in the heat affected zone of 2205 duplex stainless steel arc welds. In Damm EB, Merwin MJ, editors, A Symposium on the Thermodynamics, kinetics, Characterizaion and Modeling of: Austenite Formation and Decomposition. 2003. p. 177-192