Abstract
The effect of reactive and non-reactive ceramic inclusions on the low cycle fatigue life of low carbon Astroloy subjected to hot isostatic pressing was studied at 25 °C and at 500 °C. Low carbon Astroloy powder with a −500 mesh size was seeded with either Al 2O 3 or SiO 2 particles in concentrations ranging from 2 to 40 ppm. At 25 °C the fracture was initiated at the ceramic-metal interface whereas at 500 °C the fracture was initiated in the ceramic. The ceramics are more detrimental at 500 °C since they act as large starter cracks. The Al 2O 3 ceramic proved to be more detrimental than the SiO 2 ceramic. A relationship between the initial stress intensity of the ceramics and the fatigue life was found. The SiO 2 particle reacted with the alloy to produce a “granular”-type inclusion by the following reactions: 4Al(alloy) + 3SiO 2 → 2Al 2O 3 + 3Si(alloy) Ti(alloy) + SiO 2 → TiO 2 + Si(alloy) Zr(alloy) + SiO 2 → ZrO 2 + Si(alloy) It was shown that the size of the granular inclusion was equal to the size of the initial SiO 2 particle.
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