X-ray microdiffraction and EBSD study of FSP induced structural/phase transitions in a Ni-based superalloy |
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Authors: | Oleg M Barabash Rozaliya I Barabash Gene E Ice Zhili Feng David Gandy |
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Affiliation: | aOak Ridge National Laboratory, Oak Ridge, TN 37831, United States;bMaterials Science and Engineering Department, The University of Tennessee, Knoxville, TN 37996, United States;cElectric Power Research Institute, Charlotte, NC, 28262, United States |
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Abstract: | Severe plastic deformation during Friction Stir Processing (FSP) of an IN738 Ni-based superalloy was studied by means of X-ray polychromatic microdiffraction, EBSD, scanning electron and optical microscopies. Modeling of the physical properties and phase composition was also performed. Several distinct zones are formed during FSP including a stir zone (SZ), a thermal-mechanical affected zone (TMAZ) and a heat affected zone (HAZ). Each zone has distinct microstructure after FSP. The initial dendrite structure is preserved in the HAZ, while strengthening γ′-phase particles partially dissolve and coagulate. Plastic deformation of the base material dendrites takes place in the TMAZ and a large number of geometrically necessary dislocations are formed. The extent of deformation increases toward the SZ and the dendrite structure is completely destroyed in the SZ and replaced by a fine submicrocrystallinne microstructure. |
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Keywords: | X-ray diffraction Friction stir processing Ni-based superalloy EBSD |
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