SYMPOSIA PAPER Published: 01 January 1968
STP33621S

Relation of Strength and Toughness to Fine Structures in a Beta Titanium Alloy

Source

Although a great deal of mechanical properties data on titanium alloys have appeared in the literature, no attempt has been made to relate the fine structures in beta titanium alloys to strength and fracture toughness. Therefore, strength and fracture toughness properties of B-120VCA—obtained through a variety of thermal and thermomechanical treatments—were related to fine structures by transmission electron microscopy, electron fractography, etc. Effects of (1) prior solution-treating temperatures, (2) cold working after solution treating, and (3) cold working both before and after solution treating were evaluated in terms of strength and fracture toughness, and parallel fine structure studies. The double cold-work treatment, without aging, produced σt with a fracture toughness of 115 ksi√in. and may be promising for certain high-strength applications. Also short aging times produce unique combinations of strength and fracture toughness (σt ≈ 190 ksi, Kc ≈ 70 ksi√in. The kinetics of β→ α transformation were characterized and related to fracture toughness and strength properties. Precipitation of omega was suggested in the solution-annealed material during cooling to room temperature; further growth of this phase upon prolonged aging at 600 F was established. At 900 F, omega growth was limited, being replaced by alpha precipitation first in a discontinuous and later in a general dispersion.

Author Information

Banerjee, BR
Hunter Research Laboratories, Crucible Steel Co., Pittsburgh, Pa.
Hauser, JJ
Hunter Research Laboratories, Crucible Steel Co., Pittsburgh, Pa.
Capenos, JM
Hunter Research Laboratories, Crucible Steel Co., Pittsburgh, Pa.
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Details
Developed by Committee: B10
Pages: 100–123
DOI: 10.1520/STP33621S
ISBN-EB: 978-0-8031-4571-9
ISBN-13: 978-0-8031-0748-9