Microstructure and sound velocity of Ti-N-O synthetic inclusions in Ti-6Al-4V

Journal Article · Tue Nov 01 00:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02648853· OSTI ID:6824383

Gigliotti, M F.X.; Gilmore, R S; Perocchi, L C ^[1]

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1. General Electric Co., Schenectady, NY (United States). Corporate Research and Development

Nitrogen and oxygen stabilize the alpha phase in titanium. Regions within Ti alloy parts containing high local levels of N and O can stabilize a hard-alpha phase. The ultrasonic properties of titanium-nitrogen-oxygen inclusions within Ti-6Al-4V (Ti64) blocks were measured and related to inclusion chemistry. Sound velocities were measured on Ti-N-O alloy samples that had been prepared by powder metallurgy and ingot-melting techniques. The contributions to sound velocity from oxygen and nitrogen contents were determined. Then, Ti64 blocks were hot isostatic pressing (HIP) bonded to contain inclusions of the Ti-N-O alloys. The signal-to-noise ratios of reflections from uncracked inclusions were found to be an increasing function of inclusion interstitial content and were related to changes in sound velocity with inclusion chemistry. Measurements were made of the reflectance of titanium-nitrogen inclusions in titanium and Ti64.

• OSTI ID: 6824383
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 25:11; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
INCLUSIONS
CHEMICAL COMPOSITION
MICROSTRUCTURE
TITANIUM BASE ALLOYS
VANADIUM ALLOYS
EXPERIMENTAL DATA
NITROGEN
PHASE STUDIES
TITANIUM-ALPHA
ULTRASONIC TESTING
ACOUSTIC TESTING
ALLOYS
DATA
ELEMENTS
INFORMATION
MATERIALS TESTING
METALS
NONDESTRUCTIVE TESTING
NONMETALS
NUMERICAL DATA
TESTING
TITANIUM
TITANIUM ALLOYS
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies