A STUDY OF BETA EMBRITTLEMENT IN HIGH-STRENGTH TITANIUM ALLOYS. Period covered: March 1, 1957 to February 28, 1958

Technical Report · Mon Mar 31 04:00:00 EST 1958

OSTI ID:4279649

Griest, A J; Young, A P; Robinson, H A; Frost, P D

Studies were conducted to determine the importance of beta grain size as a contributing factor to the loss of ductility that occurs when titanium alloys are heat treated at temperatures above thc beta transus. in a second phase of the research a heat-treatment program was carried out in an effort to develop procedures for restoring ductility in beta-embrittled material. To supplement these studies, a microscopic study of deformation in pcrtincnt microstructores was conducted. The primary cause of beta embrittlemcnt is the large grain size which is obtained so rapidly in many alpha-beta titanium alloys when heated into thc beta field. Grainboundary alpha and acicular intragranular alpha in the microstructure are not detrimental if the beta grain size is fine. The structures resulting from beta treatments anre quite stable and can not bc significantiy altered in a beneficial way by heat treatment alone. Certain alloys (such as Ti-16V-2.5Al) show a relatively low rate of beta grain growth. Development of alloys exhibiting this property appears to offer the most promising means of avoiding or minimizing beta-embrittiemeat effects. (auth)

• Research Organization: Battelle Memorial Inst., columbus, Ohio
• NSA Number: NSA-13-002193
• OSTI ID: 4279649
• Report Number(s): WADC-TR-58-161; AD-155835
• Country of Publication: United States
• Language: English

Related Subjects

ALLOTROPY
ALUMINUM ALLOYS
BRITTLENESS
CONFIGURATION
DEFORMATION
DUCTILITY
GRAIN SIZE
HEAT TREATMENTS
LOSSES
METALLURGY AND CERAMICS
RECOVERY
TITANIUM ALLOYS
VANADIUM ALLOYS