THE USE OF STRAIN SOFTENING TO IMPROVE THE PROPERTIES OF REFRACTORY METALS.
Quarterly progress rept. no. 5, 1 June-31 Aug 63,
MATERIALS RESEARCH LAB INC RICHTON PARK ILL
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The Molybdenum-0.5 Ti Alloy was flexed at room temperature with the largest available rolls during this time period. It was found that two passes lowered the transition temperature by 60 F. Measuring these strains by use of photogrid techniques and by measuring the radius of curvature of the bent plate indicate that the large rolls are producing almost twice as much surface strain as the medium sized ones. Flexing TZM alloy produced results that were quite different from those attained on the Molybdenum-0.5 Ti Alloy. In the latter, the NDT temperature was suppressed with only modest changes in the knee of the ductility-testing temperature curve. In the TZM, on the other hand, the NDT was essentially unchanged by flexing, while the knee was lowered approximately 100 F. In the first attempt to flex tungsten there was no property improvement. Author