Modeling the Ferrite-Austenite Transformation in the Heat-Affected Zone of Stainless Steel Welds

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The diffusion-controlled ferrite-austenite transformation in stainless steel welds was modeled. An implicit finite-difference analysis that considers multi-component diffusion was used. The model was applied to the Fe-Cr-Ni system to investigate the ferrite- austenite transformation in the heat-affected zone of stainless steel weld metal. The transformation was followed as a function of time as the heat-affected zone was subjected to thermal cycles comparable to those experienced during gas-tungsten arc welding. The results showed that the transformation behavior and the final microstructural state are very sensitive to the maximum temperature that is experienced by the heat-affected zone. For high maximum exposure temperatures ... continued below

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24 p.

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Vitek, J.M. & David, S.A. December 1, 1997.

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The diffusion-controlled ferrite-austenite transformation in stainless steel welds was modeled. An implicit finite-difference analysis that considers multi-component diffusion was used. The model was applied to the Fe-Cr-Ni system to investigate the ferrite- austenite transformation in the heat-affected zone of stainless steel weld metal. The transformation was followed as a function of time as the heat-affected zone was subjected to thermal cycles comparable to those experienced during gas-tungsten arc welding. The results showed that the transformation behavior and the final microstructural state are very sensitive to the maximum temperature that is experienced by the heat-affected zone. For high maximum exposure temperatures ({approximately} 1300{degree} C), the ferrite formation that occurs at the highest temperatures is not completely offset by the reverse ferrite dissolution at lower temperatures. As a result, for high temperature exposures there is a net increase in the amount of ferrite in the microstructure. It was also found that if compositional gradients are present in the initial ferrite and austenite phases, the extent of the transformation is impacted.

Physical Description

24 p.

Notes

OSTI as DE98001916

Source

  • 1997 conference on numerical analysis of weldability, Graz (Austria), 29 Sep - 1 Oct 1997

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  • Other: DE98001916
  • Report No.: ORNL/CP--95656
  • Report No.: CONF-9709120--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 629295
  • Archival Resource Key: ark:/67531/metadc693594

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  • December 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 25, 2016, 6:47 p.m.

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Vitek, J.M. & David, S.A. Modeling the Ferrite-Austenite Transformation in the Heat-Affected Zone of Stainless Steel Welds, article, December 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc693594/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.