Microstructures and mechanical properties of rolled sheets of a Ti-45.5Al-2Nb-2Cr alloy

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:225149

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

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1. UES, Inc., Dayton, OH (United States). Materials and Processes Division
2. Wright Lab., Wright-Patterson AFB, OH (United States). Materials Directorate

Multi-pass hot pack rolling of a wrought Ti-45.5Al-2Nb-2Cr alloy was carried out at nominal furnace temperatures varying from 1,175 to 1,254 C to obtain thin packs of 3--4 mm thickness. Immediately after rolling, the packs were subjected to a variety of specially designed direct heat treatments in the temperature range 1,200--1,321 C. A variety of microstructures ranging from fine grained ({approximately}100 {micro}m) fully transformed lamellar structure, through duplex aggregates, to a nearly equiaxed structure is observed in these sheets due to several competing transformation paths such as ordering of {alpha} {r_arrow} {alpha}{sub 2}, decomposition of {alpha} {r_arrow} {alpha}{sub 2} + {gamma}, and recrystallization/globularization of {alpha}/{gamma} grains. Tensile properties and microhardness evaluated in both longitudinal and transverse orientations, suggest that extremely fine grained, duplex microstructures encountered in the as-rolled state lead to substantial improvements in mechanical properties.

• OSTI ID: 225149
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
EXPERIMENTAL DATA
FORGING
GRAIN SIZE
HARDNESS
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
LAMELLAE
MECHANICAL PROPERTIES
MICROSTRUCTURE
NIOBIUM ALLOYS
OPTICAL MICROSCOPY
ROLLING
SCANNING ELECTRON MICROSCOPY
TENSILE PROPERTIES
THERMOMECHANICAL TREATMENTS
TITANIUM ALLOYS
X-RAY RADIOGRAPHY