Effects of Isothermal Forging Conditions on the Properties and Microstructures of Ti-10V-2Fe-3Al.
Final rept. Mar 75-May 78,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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The effects of isothermal forging conditions on the properties and microstructures of Ti-10V-2Fe-3Al were investigated. Ring specimens with two different grain sizes were forged isothermally on a hydraulic press at two different speeds 0.03 and 3.0 ipm. The ring specimens with the smaller grains 8 microns were forged at three temperatures 1250 F677 C, 1350 F732 C and 1450 F788 C the rings with the larger grains 255 microns were forged at eight temperatures in the range 1190 F643 C to 1750 F954 C. After forging, the rings were quenched in water to retain the as-forged structure. The resulting microstructures were determined. The room temperature mechanical properties resulting from forging at selected conditions were also determined. The flow stress and the resulting microstructures and mechanical properties depend on the forging conditions used, which can be characterized by the value of the flow stress. It is proposed that if the flow stress forging conditions is known, the room temperature mechanical properties tensile, fracture toughness, WA may be closely estimated. Furthermore, a long-term relation is shown to exist between room temperature Rockwell C hardness and flow stress and room temperature properties, which could be used for a rough estimate of the properties of the as-forged material.
- Properties of Metals and Alloys
- Fabrication Metallurgy