TEMPERING OF TITANIUM ALLOYS. TEMPERING AND RECOVERY OF TITANIUM-VANADIUM ALLOYS

Journal Article · Sun Dec 01 04:00:00 EST 1957 · Technische Mitteilungen Krupp (West Germany) Divided into Tech. Mitt. Krupp, Forschungsber. and Tech. Mitt. Krupp, Werksber.

OSTI ID:4172131

Knorr, W

The tempering behavior of binary titanium-vanadium alloys with 12, 15, and 18% vanadium was investigated. After formation of the omega = phase the hardness of the alloy with 15 - V increases in quenching after incandesence in the beta region; the alloys with 12 and 18% V form no quenched omega phase. On annealing between 200 and 400 deg C, the hardness increase is the fastest in the 15% alloy, s increase the precipitation the hnrdness shows an instability. Dilatometric measurements indicate that the omega formation occurs in several stages. Microscopic investigations show that an alpha precipitation, which arises at impuritv and lattice perturbation sites, runs parallel in the region of the omega formation. The omega yields alpha transition wns displaced to an earlier time. At temperatures over 400 deg C a rapidly occurring recovery sets tn. At 550 deg C the omega phase formed in the annealing recovers completely, but the omega phase formed in quenching is only partially restored. The restoration increase with increasing restoration temperature. The aging time and temperature nppear to have no effect on the recovery..After a brief recovery time the beta crystals formed are completely hardenable, but with longer recovery alpha precipitation sets tn and the hardenable beta mixed crystals decrease. The alpha precipitation connected with the recovery is bound to a iow hardness increase. In coid deformation the hardening is accelerated by omega formation. The subsequent alpha precipitation sets in also in unprocessed samples. After cold working, the hardness is recoverabie. The reprecipitation leads to a smaller hardness increase since the alpha precipitation is accelerated after recovery following preliniinary cold working. (tr-auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-14-012027
• OSTI ID: 4172131
• Journal Information: Technische Mitteilungen Krupp (West Germany) Divided into Tech. Mitt. Krupp, Forschungsber. and Tech. Mitt. Krupp, Werksber., Journal Name: Technische Mitteilungen Krupp (West Germany) Divided into Tech. Mitt. Krupp, Forschungsber. and Tech. Mitt. Krupp, Werksber. Vol. Vol: 15; ISSN TMKRA
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

ANNEALING
COLD WORKING
CRYSTALS
DEFORMATION
EXCITATION
EXPANSION
HARDNESS
HEAT TREATMENTS
IMPURITIES
LATTICES
MEASURED VALUES
METALS, CERAMICS, AND MATERIALS
MICROSCOPY
PHASE DIAGRAMS
PRECIPITATION
QUENCHING
RECOVERY
SAMPLING
STABILITY
TEMPERATURE
TEMPERING
THERMODYNAMICS
TITANIUM ALLOYS
VANADIUM ALLOYS