Feasibility of correlating V-Cr-Ti alloy weld strength with weld chemistry. CRADA final report

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The mechanical properties of refractory metals such as vanadium are determined to a large extent by the interstitial impurities in the alloy. In the case of welding, interstitial impurities are introduced in the welding process from the atmosphere and by dissolution of existing precipitates in the alloy itself. Because of the necessity of having an ultra-pure atmosphere, a vacuum chamber or a glove box is necessary. In the V-Cr-Ti system, the titanium serves as a getter to control the concentration of oxygen and nitrogen in solid solution in the alloy. In this project the secondary ion mass spectrometry (SIMS) technique ... continued below

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14 p.

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Grossbeck, M.L. & Odom, R.W. June 1, 1998.

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  • Grossbeck, M.L. Oak Ridge National Lab., TN (United States)
  • Odom, R.W. Charles Evans and Associates, Redwood City, CA (United States)

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Description

The mechanical properties of refractory metals such as vanadium are determined to a large extent by the interstitial impurities in the alloy. In the case of welding, interstitial impurities are introduced in the welding process from the atmosphere and by dissolution of existing precipitates in the alloy itself. Because of the necessity of having an ultra-pure atmosphere, a vacuum chamber or a glove box is necessary. In the V-Cr-Ti system, the titanium serves as a getter to control the concentration of oxygen and nitrogen in solid solution in the alloy. In this project the secondary ion mass spectrometry (SIMS) technique was used to detect, measure, and map the spacial distribution of impurity elements in welds in the alloy V-4Cr-4Ti. An attempt was then made to correlate the concentrations and distributions of the impurities with mechanical properties of the welds. Mechanical integrity of the welds was determined by Charpy V-notch testing. Welds were prepared by the gas-tungsten-arc (GTA) method. Charpy testing established a correlation between weld impurity concentration and the ductile to brittle transition temperature (DBTT). Higher concentrations of oxygen resulted in a higher DBTT. An exception was noted in the case of a low-oxygen weld which had a high hydrogen concentration resulting in a brittle weld. The concentrations and distributions of the impurities determined by SIMS could not be correlated with the mechanical properties of the welds. This research supports efforts to develop fusion reactor first wall and blanket structural materials.

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14 p.

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INIS; OSTI as DE98054346

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  • Other Information: PBD: Jun 1998

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  • Other: DE98054346
  • Report No.: ORNL/M--6554
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/654030 | External Link
  • Office of Scientific & Technical Information Report Number: 654030
  • Archival Resource Key: ark:/67531/metadc708311

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  • June 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 25, 2016, 12:49 p.m.

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Grossbeck, M.L. & Odom, R.W. Feasibility of correlating V-Cr-Ti alloy weld strength with weld chemistry. CRADA final report, report, June 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc708311/: accessed December 9, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.