Title of article :
Hot rolling of gamma titanium aluminide foil Original Research Article
Author/Authors :
S.L. Semiatin، نويسنده , , B.W. Shanahan، نويسنده , , F. Meisenkothen ، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2010
Pages :
12
From page :
4446
To page :
4457
Abstract :
Metal flow and microstructure evolution during the thermomechanical processing of thin-gage foil of a near-gamma titanium aluminide alloy, Ti–45.5Al–2Cr–2Nb, with an equiaxed-gamma microstructure was investigated experimentally and theoretically. Foils of thickness of 200–250 μm were fabricated via hot rolling of sheet in a can of proprietary design. The variation in gage of the rolled foils was ±15 μm except in very sporadic (local) areas, with variations of approximately 60 μm relative to the mean. Metallography revealed that the larger thickness variations were associated with large remnant colonies lying in a hard orientation for deformation. To rationalize these observations, a self-consistent model was used to estimate the strain partitioning between the softer (equiaxed-gamma) matrix and the remnant colonies. Furthermore, the efficacy of pre- or post-rolling heat treatment in eliminating remnant colonies was demonstrated and quantified using a static-spheroidization model. The elimination of remnant colonies via spheroidization prior to foil rolling gave rise to improved gage control.
Keywords :
Titanium aluminides , Rolling , Annealing , Spheroidization , Deformation inhomogeneities
Journal title :
ACTA Materialia
Serial Year :
2010
Journal title :
ACTA Materialia
Record number :
1145039
Link To Document :
بازگشت