Deformation and microstructure development during hot-pack rolling of a near-gamma titanium aluminide alloy

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02664673· OSTI ID:6590312

Semiatin, S L ^[1]; Seetharaman, V ^[2]

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1. Wright Lab. Materials Directorate, Wright-Patterson Air Force Base, OH (United States). Metals and Ceramics Division
2. UES, Inc., Dayton, OH (United States)

Deformation behavior and microstructure development during hot pack rolling of the near-gamma titanium aluminide alloy Ti-45.5Al-2Cr-2Nb (atomic percent) were established. Deformation behavior was investigated through rolling at various nominal furnace temperatures and parallel modeling studies using a finite difference approach to predict temperature transients during workpiece transfer from the furnace and during the rolling operation itself. Agreement between measured rolling pressures and predictions based on a rule-of-mixtures (ROM) average of the flow stresses of the pack components (at the predicted temperatures and strain rates within the roll gap) was excellent. As-rolled microstructures were interpreted in terms of the Ti-xAl-2Cr-2Nb pseudo binary phase diagram, predicted temperature transients during rolling, and the static (no deformation) phase-transformation behavior of the program material. These results demonstrated the strong influence of furnace preheat temperature on microstructure development, as well as the tendency for temperature transients due to radiation heat losses and roll chilling to suppress phase transformations.

• OSTI ID: 6590312
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 26:2; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COMPARATIVE EVALUATIONS
DATA
DEFORMATION
EVALUATION
EXPERIMENTAL DATA
FABRICATION
HOT WORKING
INFORMATION
INTERMETALLIC COMPOUNDS
MATERIALS WORKING
MICROSTRUCTURE
NIOBIUM ALLOYS
NUMERICAL DATA
TITANIUM ALLOYS