The Relationship of Microstructure and Mechanical Properties of Extruded Titanium Alloy Bars to the Prior Deformation Processing History.
Technical rept. 17 Nov 68-15 Jul 70,
WESTINGHOUSE ASTRONUCLEAR LAB PITTSBURGH PA
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The inter-relation of extrusion process variables with mechanical properties and microstructure is analyzed for three titanium alloys Ti-5Al-2.5Sn, Ti-6Al-4V and Ti-13V-11Cr-3Al. Information is obtained from duplicate billets which were extruded at same conditions with one extruded bar allowed to air cool and the other bar water quenched immediately after extrusion. Results indicate that significant reduction in deformation loads can be achieved in alpha and alpha-beta titanium alloys by processing them in the beta temperature range. Resultant metallurgical structures and mechanical properties room temperature tensile and Charpy V notch impact are found to not be significantly affected by process variables other than preheat temperature and product cooling rate. In alpha and alpha-beta alloys, the room temperature strength properties of beta processed and water quenched product is significantly improved over those of beta processed and air cooled product and somewhat improved over those for alpha-beta processed followed by either air cooling or water quenching. Mechanical properties from the beta alloy are not significantly affected by process temperature or by product cooling rate except for some anomalous behavior in the 2050F processing temperature range. Author
- Properties of Metals and Alloys