A novel process for breakdown forging of coarse-grain intermetallic alloys

Journal Article · Mon Nov 01 00:00:00 EST 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90115-9· OSTI ID:5788823

Semiatin, S L ^[1]; McQuay, P A ^[2]; Seetharaman, V ^[3]

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1. Wright Lab., Wright-Patterson AFB, OH (United States). Materials Directorate
2. AFOSR/AOARD, Tokyo (Japan). Asian Office of Aerospace R and D
3. UES, Dayton, OH (United States)

The objective of the present work was to develop a novel hot forging process for breakdown of high-temperature intermetallic alloys which exhibit dynamic recrystallization during hot working. During typical forging processes in hydraulic processes, be they based on isothermal or conventional approaches, the ram speed (or sometimes the effective strain rate) is held constant during the forging stroke. In the method introduced here, the ram speed is increased substantially during the forging stroke as the material recrystallizes to a finer-grained structure and its hot workability increases. By this means, fracture is avoided, grain size is reduced, and processing time is decreased, thus improving material quality and reducing cost. The material used to develop and demonstrate the novel forging process was the single phase gamma titanium aluminide, Ti-51Al-2Mn.

• OSTI ID: 5788823
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 29:9; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
FABRICATION
RECRYSTALLIZATION
MANGANESE ALLOYS
TITANIUM ALLOYS
FORGING
GRAIN SIZE
HOT WORKING
INTERMETALLIC COMPOUNDS
ALLOYS
ALUMINIUM ALLOYS
MATERIALS WORKING
MICROSTRUCTURE
SIZE
360101* - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies