Effect of oxide inclusions on the solid state transformation in low-alloy steel fusion welds

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Non-metallic inclusions are known to influence the properties of low alloy steel weld metal by altering the microstructure development. Isothermal transformation kinetics of austenite to acicular ferrite and allotriomorphic ferrite were measured in reheated low alloy steel weld deposits with similar weld compositions and austenite grain size but different inclusion characteristics. Accelerated kinetics of the transformation to acicular ferrite were observed in the weld metal containing coarser titanium-rich inclusions. The results are also discussed in relation to the predictions of inclusion model. The kinetics of the transformation to allotriomorphic ferrite were not influenced by a change in the inclusion characteristics, ... continued below

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7 p.

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Babu, S.S.; David, S.A. & Vitek, J.M. December 31, 1995.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 16 times . More information about this article can be viewed below.

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Description

Non-metallic inclusions are known to influence the properties of low alloy steel weld metal by altering the microstructure development. Isothermal transformation kinetics of austenite to acicular ferrite and allotriomorphic ferrite were measured in reheated low alloy steel weld deposits with similar weld compositions and austenite grain size but different inclusion characteristics. Accelerated kinetics of the transformation to acicular ferrite were observed in the weld metal containing coarser titanium-rich inclusions. The results are also discussed in relation to the predictions of inclusion model. The kinetics of the transformation to allotriomorphic ferrite were not influenced by a change in the inclusion characteristics, but, rather, by a change in austenite grain size. A theoretical analysis of austenite grain development during weld cooling is considered in this work. The austenite grain size was found to depend on the driving force for transformation from 6 ferrite to austenite ({Delta}G{sup {sigma}->{gamma}}) calculated from ThermoCalc{trademark} software.

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7 p.

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OSTI as DE96003782

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  • 4. international conference on trends in welding research, Gatlinburg, TN (United States), 5-9 Jun 1995

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  • Other: DE96003782
  • Report No.: CONF-950682--11
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 172121
  • Archival Resource Key: ark:/67531/metadc672998

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 19, 2016, 12:58 p.m.

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Babu, S.S.; David, S.A. & Vitek, J.M. Effect of oxide inclusions on the solid state transformation in low-alloy steel fusion welds, article, December 31, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc672998/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.