An analysis of deformation, temperature, and microstructure for hot extruded titanium alloy

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Metallurgical Transactions, B (Process Metallurgy); (United States)

DOI:https://doi.org/10.1007/BF02657880· OSTI ID:6312008

Kimura, K; Yoshimura, H ^[1]; Ishii, M ^[2]

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1. Hikari Research and Development Lab. (Japan)
2. Nippon Steel Corp., Chiba (Japan)

During hot extrusion, the microstructure and resultant mechanical properties of materials are subjected to considerable change due to adiabatic local heat generation. In this work, strain, temperature distributions, and microstructural changes resulting from the hot extrusion of Ti-6Al-4V alloy were studied using visioplasticity methods, thermal calculations, and optical microscopy. The results were correlated to the microstructural behavior during hot deformation. Billets 62 mm in diameter were heated to either 950 C ([alpha] + [beta] region) or 1100 C ([beta] region) and extruded at the extrusion ratios of either 6 or 12. Visioplasticity calculations show that, in the deformation zone, strain is relatively high at the surface of the billet and gradually decreases with depth. Estimated strains of a bar extruded at 950 C with the extrusion ratio of 12 are 3.5 at the surface and 2.5 at the center, respectively. But the estimated temperature at the surface is lower than that at the center. As a result, microstructures of the bar were bi-modal structure at the surface and acicular transformed structure at the center. A bar extruded at 950 C with an extrusion ratio of 6 had all bi-modal microstructure. The strain distributions of bar extruded at 1100 C were similar in nature to those at 950 C.

• OSTI ID: 6312008
• Journal Information: Metallurgical Transactions, B (Process Metallurgy); (United States), Journal Name: Metallurgical Transactions, B (Process Metallurgy); (United States) Vol. 24:1; ISSN MTTBCR; ISSN 0360-2141
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CORROSION RESISTANT ALLOYS
DATA
DEFORMATION
EXPERIMENTAL DATA
EXTRUSION
FABRICATION
INFORMATION
MATERIALS WORKING
MEASURING METHODS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
MORPHOLOGICAL CHANGES
NUMERICAL DATA
OPTICAL MICROSCOPY
PLASTICITY
STRAINS
TEMPERATURE DISTRIBUTION
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS
VISCOSITY