Simulation of Hot Working Operations by Means of Torsion Testing.
Final rept. 1 Jul 66-31 Jun 68,
STANFORD UNIV CA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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The torsion apparatus was modified to improve specimen alignment. Control mechanisms have been devised to enable high strain rate tests to be interrupted in predetermined fractions of a second. Stress measuring mechanisms were improved by the use of a load cell with a fast action, three-channel chart recorder to record torque, temperature, and number of twists as a function of time. Torsion tests and extrusion tests were made to investigate the hot working characteristics of three materials a titanium alloy, Ti-6Al-4V, a high strength steel, D6-ac, and a nickel base alloy, Udimet 700. The following factors were investigated for each alloy by torsion tests made at several different temperatures and strain rates 1 ductility, 2 stress-strain relations, 3 peak flow stress, 4 temperature increase during deformation. Extrusion tests at three temperatures and torsion tests under comparable conditions were made on each of the alloys. The microstructures of the resulting products were examined and photomicrographs are presented for comparisons. Author
- Properties of Metals and Alloys
- Fabrication Metallurgy