Characterization and prediction of austenite formation and decomposition in steel welds

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

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

2 Scopus citations

Abstract

Austenite formation and its decomposition control the final microstructure and performance of steel welds. This paper presents an in-situ characterization of austenite formation and its decomposition in both the fusion zone (FZ) and heat-affected zone (HAZ) of an Fe-C-Al-Mn steel using time-resolved X-ray diffraction (TRXRD) with synchrotron radiation. Measurement of X-ray diffraction spectra at a time resolution of 0.05 s allowed monitoring of the sequence of phase evolution in welds. In steel containing 1.7 wt.% Al, incomplete austenite formation from the ferrite microstructure was observed in the HAZ during weld heating, which is in agreement with equilibrium thermodynamic predictions. In the case of the FZ, nonequilibrium austenite solidification was observed at high cooling rates, followed by its decomposition during the latter stages of the cooling cycle. A theoretical treatment of both austenite formation and its decomposition in these welds, based on existing thermodynamic and kinetic models is used to explain these experimental results.

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
Pages343-352
Number of pages10
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

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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    Babu, S. S., Vitek, J. M., David, S. A., Palmer, T., & Elmer, J. W. (2003). Characterization and prediction of austenite formation and decomposition in steel welds. In E. B. Damm, & M. J. Merwin (Eds.), A Symposium on the Thermodynamics, kinetics, Characterizaion and Modeling of: Austenite Formation and Decomposition (pp. 343-352)