Kinetics of recovery and recystallization of the large heat of V-4Cr-4Ti

Technical Report · Mon Apr 01 04:00:00 EST 1996

DOI:https://doi.org/10.2172/270419· OSTI ID:270419

Gubbi, A N; Rowcliffe, A F; Eatherly, W S; Gibson, L T

A series of slow cycle and rapid cycle anneals was carried out in the large heat of V-4Cr-4Ti alloy (heat 832665). Also, a differential scanning calorimetry (DSC) study was initiated on the samples of the same alloy. The recovery and recrystallization phenomena of V-4Cr-4Ti in slow cycle annealing were quite different from that observed in rapid cycle annealing. The large driving force for recrystallization due to rapid heating resulted in the first nuclei appearing after only 1 minute of 1000{degrees}C. There was a two-stage hardness reduction; the first stage involved recovery due to cell formation and annihilation of dislocation, and second stage was associated with the growth of recrystallization nuclei. This is consistent with results obtained from the DSC in which there was a broad exothermic peak from {approx}200 to 800{degrees}C due to recovery followed by a sharp exotherm associated with recrystallization. The activation energy for recrystallization for V-4Cr-4Ti, which was determined at 576 {+-} 75, kJ/mole is significantly higher than that for pure V, and is thought to be related to Ti and Cr in solid solution.

• Research Organization: Oak Ridge National Lab., TN (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 270419
• Report Number(s): DOE/ER--0313/19; ORNL/M--5023; ON: DE96010874
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANNEALING
CALORIMETRY
CHROMIUM ALLOYS
MICROSTRUCTURE
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RECRYSTALLIZATION
THERMONUCLEAR REACTOR MATERIALS
TITANIUM ALLOYS
VANADIUM BASE ALLOYS