The Effect of Irradiation on the Fatigue and Flow Behavior of TZM Alloy
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- Category: Molybdenum knowledge
- Published on 21 September 2015
- Written by yiping
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The pre-irradiation and postirradiation fatigue and flow properties of TZM alloy have been determined at 427°C. Neutron irradiation to a fluence of 1 × 1022n/cm2 > 0.1 MeV increased the fatigue life when the stress relieved TZM alloy in vacuum by approximately a factor of two in the strain range of 0.11 to 0.18%. The environmental effect of gaseous impurities on the rate of fatigue crack growth in unirradiated TZM was investigated for air pressures from approximately 10−4 to 100 Pa. Compressive now properties were determined at 427°C at a strain rate of 1 × 10−3 sec−1 and at 500°C for a range of strain rates. Irradiation to a fluence of 1.2 × 1022 n/cm2 increased the yield strength of stress relieved TZM by about 50 percent. The ductile to brittle transition temperature appeared to be between 427 and 500°C at a compressive strain rate of 1 × 10−3 sec−1. Irradiation induced changes in microhardness and yield strength were correlated with TEM results using general hardening models.
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