SHORT-TERM AND STRESS-RUPTURE STRENGTH OF A BETA-ALLOY OF THE Ti-Mo-Cr-Fe-Al SYSTEM AT HIGH TEMPERATURES,
Abstract
To clarify whether it was possible to use a titanium beta-alloy (Ti, 7 percent, Mo, 5.5 percent, Cr, 3 percent, Fe, 3 percent A1) quenched from 800 C (1 hr) in water and aged at 550 and 525 C for 15 hr (modes 1 and 2), 500 C for 20 hr (mode 3), 450 C for 50 hr (mode 4) with subseuent air cooling at elevated temperatures, as well as to make a comparative evaluation of these modes of aging, the high-temperature resistance of the metal was studied by the centrifugal bending method. Mode 1 proved to be most effective. A study was also made of the alloy properties at temperatures from 20 to 700 C. Of the two aging modes 1 and 2, the former resulted better mechanical properties. The alloy aged at 550 C, for 15 hr may be used as a high-temperature resistant material to 450 C since at these temperatures the alloy keeps the same strength value (130-127 kp/mm) with a plasticity of 6 to 8 percent. In stress-rupture strength tests at 350,400, and 500 C it was found that by selecting the modes of mechanicothermal treatment, for the purpose of giving the beta-grains a polygonal structure which leads to more uniform distribution of the separated alpha-phase (along the dislocation walls), high heat-resistant properties may be obtained in the alloy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 08, 1970
- Accession Number
- AD0705743
Entities
People
- G. N. Tarasenko
- L. A. Petrova
- L. P. Grankova
- N. V. Ageev
- S. G. Glazunov
Organizations
- National Air and Space Intelligence Center