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Oxidation Assisted Intergranular Cracking in Alloy 718: Effects of Strain Rate and Temperature

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Academic year: 2021

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Figure  1  -  Typical  fracture  surface  SEM  micrographs  for  (a)  a  tensile  test  under simulated PWR testing conditions and (b) a tensile test at 650°C in air
Figure 4 - Typical SEM micrographs of alloy 718 used in this study:  (a) fully recrystallized equiaxed microstructure
Figure 7 - Evolution of the flow stress for 650°C tensile tests in laboratory air  as a function of strain rate
Figure  11  -  Graphs  of  (a)  applied  intergranular  stress  and  critical  decohe- decohe-sion stress of grain boundaries, (b,c) some possible temporal evolutions of  applied normal stress and critical bonding stress leading to grain boundary  opening

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