X-ray Microdiffraction and EBSD Study of FSP Induced Structural/Phase Transitions in a Ni-based Superalloy

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Materials Science and Engineering A

DOI:https://doi.org/10.1016/j.msea.2009.03.086· OSTI ID:965843

Barabash, Oleg M ^[1]; Barabash, Rozaliya ^[1]; Ice, Gene E ^[1]; Feng, Zhili ^[1]; Gandy, Dr. David ^[2]

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1. ORNL
2. Electric Power Research Institute (EPRI)

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 ??-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 submicrocrystalline microstructure.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 965843
• Journal Information: Materials Science and Engineering A, Vol. A 524, Issue 1-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
DENDRITES
DISLOCATIONS
ELECTRONS
FRICTION
HEAT AFFECTED ZONE
HEAT RESISTING ALLOYS
MICROSTRUCTURE
PHYSICAL PROPERTIES
PLASTICS
PROCESSING
SIMULATION