Atom probe field-ion microscopy investigation of nickel base superalloy welds

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Microstructure development and elemental partitioning between {gamma} and {gamma}{prime} were measured in PWA-1480 electron beam welds and CMSX-4 pulsed-laser welds. In PWA-1480 EB welds, eutectic {gamma}{prime} phases were observed along the dendritic boundaries. The elemental partitioning between {gamma} and {gamma}{prime} was found to be similar to that in PWA-1480 base metal. In CMSX-4 pulsed laser welds, negligible eutectic {gamma}{prime} was observed. In addition, fine and irregularly shaped {gamma}{prime} precipitates were observed. The elemental partitioning between {gamma} and {gamma}{prime} was found to be different from that measured in the base metal. Large concentration gradients were observed in the {gamma} phase. The ... continued below

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6 p.

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Babu, S.S.; David, S.A.; Vitek, J.M. & Miller, M.K. November 1, 1998.

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Description

Microstructure development and elemental partitioning between {gamma} and {gamma}{prime} were measured in PWA-1480 electron beam welds and CMSX-4 pulsed-laser welds. In PWA-1480 EB welds, eutectic {gamma}{prime} phases were observed along the dendritic boundaries. The elemental partitioning between {gamma} and {gamma}{prime} was found to be similar to that in PWA-1480 base metal. In CMSX-4 pulsed laser welds, negligible eutectic {gamma}{prime} was observed. In addition, fine and irregularly shaped {gamma}{prime} precipitates were observed. The elemental partitioning between {gamma} and {gamma}{prime} was found to be different from that measured in the base metal. Large concentration gradients were observed in the {gamma} phase. The {gamma}{prime} precipitation kinetics in CM247DS alloy was measured using dilatometry and showed differences with different cooling rates. The microstructural investigations showed that at large undercoolings the number density of {gamma}{prime} precipitates increased and led to a finer size. This supports the microstructure development observations in PWA-1480 and CMSX-4 welds. Thermodynamic and kinetic calculations for the Ni-Al-Cr alloy system showed that as the cooling rate increases, the {gamma}{prime} growth leads to large concentration gradients in the {gamma} phase. The calculations agree with the atom probe results from PWA-1480 and CMSX-4 welds.

Physical Description

6 p.

Notes

OSTI as DE99000218

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  • 5. international conference on trends in welding research, Pine Mountain, GA (United States), 1-5 Jun 1998

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  • Other: DE99000218
  • Report No.: ORNL/CP--99118
  • Report No.: CONF-980657--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/290932 | External Link
  • Office of Scientific & Technical Information Report Number: 290932
  • Archival Resource Key: ark:/67531/metadc680784

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  • November 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 15, 2016, 12:49 p.m.

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Babu, S.S.; David, S.A.; Vitek, J.M. & Miller, M.K. Atom probe field-ion microscopy investigation of nickel base superalloy welds, report, November 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc680784/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.