Characterization and Modeling of Microstructure Development in Nickel-base Superalloy Welds

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Welding is important for economical reuse and reclamation of used and failed nickel-base superalloy blades, respectively [1]. Solidification and solid state decomposition of {gamma} (Face Centered Cubic, FCC) phase into {gamma}{prime} (L1{sub 2}-ordered) phase control the properties of these welds. In previous publications, the microstructure development in electron beam welds of PWA-1480 alloy [2] and laser beam welds of CMSX-4 alloy [3] were presented. These results showed that the weld cracking in these alloys were associated with low melting point eutectic at the dendrite boundaries [1,2]. The eutectic-{gamma}{prime} precipitation was reduced at rapid weld cooling rates and the partitioning between ... continued below

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Babu, S.S.; David, S.A.; Miller, M.K. & Vitek, J.M. November 1, 1999.

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Welding is important for economical reuse and reclamation of used and failed nickel-base superalloy blades, respectively [1]. Solidification and solid state decomposition of {gamma} (Face Centered Cubic, FCC) phase into {gamma}{prime} (L1{sub 2}-ordered) phase control the properties of these welds. In previous publications, the microstructure development in electron beam welds of PWA-1480 alloy [2] and laser beam welds of CMSX-4 alloy [3] were presented. These results showed that the weld cracking in these alloys were associated with low melting point eutectic at the dendrite boundaries [1,2]. The eutectic-{gamma}{prime} precipitation was reduced at rapid weld cooling rates and the partitioning between {gamma}-{gamma}{prime} phase was found to be far from equilibrium conditions [3,4]. This observation was related to diffusional growth of {gamma}{prime} precipitate into {gamma} phase. Subsequent to the above work, the precipitation characteristics of {gamma}{prime} phase from {gamma} phase were evaluated during continuous cooling conditions [5]. The results show that the number density of {gamma} precipitates increased with an increase in cooling rate. However, the details of this decomposition and also the fine-scale elemental partitioning characteristics between {gamma}-{gamma}{prime} were not investigated. In this paper, the precipitation characteristics of {gamma}{prime} from {gamma} during continuous cooling conditions were investigated with transmission electron microscopy, and atom probe field ion microscopy. In addition, thermodynamic and kinetic models were used to describe microstructure development in Ni-base superalloy welds.

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OSTI as DE00014979

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  • Joining of Advanced and Specialty Materials II, Cincinnati, OH (US), 11/01/1999--11/04/1999

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  • Report No.: ORNL/CP-105232
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 14979
  • Archival Resource Key: ark:/67531/metadc624821

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  • November 1, 1999

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  • June 16, 2015, 7:43 a.m.

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  • Jan. 15, 2016, 3:59 p.m.

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Babu, S.S.; David, S.A.; Miller, M.K. & Vitek, J.M. Characterization and Modeling of Microstructure Development in Nickel-base Superalloy Welds, article, November 1, 1999; Tennessee. (digital.library.unt.edu/ark:/67531/metadc624821/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.