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

Abstract

A semi-quantitative map based on a series of spatially resolved X-ray diffraction (SRXRD) scans shows the progression of the ferrite ({delta})/austenite ({gamma}) phase balance throughout the HAZ during GTA welding of a 2205 duplex stainless steel (DSS). This map shows an unexpected decrease in the ferrite fraction on heating, followed by a recovery to the original ferrite fraction on cooling at locations within the HAZ. Even though such behavior is supported by thermodynamic calculations, it has not been confirmed by either experimental methods or have the kinetics been evaluated. Both Gleeble thermal simulations and time resolved x-ray diffraction measurements on spot welds in the 2205 DSS provide further evidence for this rather low-temperature transformation. On the other hand, calculations of the diffusion of alloying elements across the 6/y interface under a variety of conditions shed no further light on the driving force for this transformation. Further work on the mechanisms and driving forces for this transformation is on-going.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15004309
Report Number(s):
UCRL-JC-147710
TRN: US201015%%494
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 6th International Conference on Trends in Welding Research, Pine Mountain, GA, Apr 15 - Apr 19, 2002
Country of Publication:
United States
Language:
English
Subject:
36; DIFFUSION; FERRITE; HEATING; KINETICS; PHASE TRANSFORMATIONS; STAINLESS STEELS; THERMODYNAMICS; TRANSFORMATIONS; WELDED JOINTS; WELDING; X-RAY DIFFRACTION

Citation Formats

Palmer, T A, Elmer, J W, Wong, J, Babu, S S, and Vitek, J M. Investigation of the Kinetics of the Ferrite/Austenite Phase Transformation in the HAZ of a 2205 Duplex Stainless Steel Weldment. United States: N. p., 2002. Web.
Palmer, T A, Elmer, J W, Wong, J, 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. United States.
Palmer, T A, Elmer, J W, Wong, J, Babu, S S, and Vitek, J M. Thu . "Investigation of the Kinetics of the Ferrite/Austenite Phase Transformation in the HAZ of a 2205 Duplex Stainless Steel Weldment". United States. https://www.osti.gov/servlets/purl/15004309.
@article{osti_15004309,
title = {Investigation of the Kinetics of the Ferrite/Austenite Phase Transformation in the HAZ of a 2205 Duplex Stainless Steel Weldment},
author = {Palmer, T A and Elmer, J W and Wong, J and Babu, S S and Vitek, J M},
abstractNote = {A semi-quantitative map based on a series of spatially resolved X-ray diffraction (SRXRD) scans shows the progression of the ferrite ({delta})/austenite ({gamma}) phase balance throughout the HAZ during GTA welding of a 2205 duplex stainless steel (DSS). This map shows an unexpected decrease in the ferrite fraction on heating, followed by a recovery to the original ferrite fraction on cooling at locations within the HAZ. Even though such behavior is supported by thermodynamic calculations, it has not been confirmed by either experimental methods or have the kinetics been evaluated. Both Gleeble thermal simulations and time resolved x-ray diffraction measurements on spot welds in the 2205 DSS provide further evidence for this rather low-temperature transformation. On the other hand, calculations of the diffusion of alloying elements across the 6/y interface under a variety of conditions shed no further light on the driving force for this transformation. Further work on the mechanisms and driving forces for this transformation is on-going.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {3}
}

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