Effect of Fluid Flow on Inclusion Coarsening in Low-Alloy Steel Welds

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Oxide inclusions form in welds because of deoxidation reactions in the weld pool. These inclusions control the weld microstructure development. Thermodynamic and kinetic calculation of oxidation reaction can describe inclusion characteristics such as number density, size, and composition. Experimental work has shown that fluid-flow velocity gradients in the weld pool can accelerate inclusion growth by collision and coalescence. Moreover, fluid flow in welds can transport inclusions to different temperature regions that may lead to repeated dissolution and growth of inclusions. These phenomena are being studied with the help of computational coupled heat transfer, fluid-flow, thermodynamic, and kinetic models. The results ... continued below

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8 Pages

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Babu, S.S.; David, S.A.; DebRoy, T. & Hong, T. February 28, 1998.

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Description

Oxide inclusions form in welds because of deoxidation reactions in the weld pool. These inclusions control the weld microstructure development. Thermodynamic and kinetic calculation of oxidation reaction can describe inclusion characteristics such as number density, size, and composition. Experimental work has shown that fluid-flow velocity gradients in the weld pool can accelerate inclusion growth by collision and coalescence. Moreover, fluid flow in welds can transport inclusions to different temperature regions that may lead to repeated dissolution and growth of inclusions. These phenomena are being studied with the help of computational coupled heat transfer, fluid-flow, thermodynamic, and kinetic models. The results show that the inclusion formation in steel welds can be described as a function of the welding processes, process parameters, and steel composition.

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8 Pages

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  • Fluid Flow Phenomenon in Metals Processing, San Diego, CA, Feb. 28-Mar. 4, 1998

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  • Other: DE00002972
  • Report No.: ORNL/CP-100538
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/290931 | External Link
  • Office of Scientific & Technical Information Report Number: 2972
  • Archival Resource Key: ark:/67531/metadc688498

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Office of Scientific & Technical Information Technical Reports

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  • February 28, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 4, 2015, 1:58 p.m.

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Babu, S.S.; David, S.A.; DebRoy, T. & Hong, T. Effect of Fluid Flow on Inclusion Coarsening in Low-Alloy Steel Welds, article, February 28, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc688498/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.