Graduate Thesis Or Dissertation
 

Time-Dependent Crack Growth Mechanisms in Alloy 617 at 800°C in Air

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  • Time-dependent crack growth mechanisms in Alloy 617 at 800°C in air were studied using compact tension samples machined in the L-T direction, cracked at temperature using an induction furnace and servo-hydraulic load frame. The application of different loading waveforms, including triangular, hold time, and sustained loading, were studied with relation to relevant crack tip parameters in order to better understand the material’s viscoplastic response to crack growth mechanisms. Fracture surfaces and crack tip profiles were examined to discover relevant relationships between transgranular cracking, void growth and coalescence, and the role of oxygen embrittlement. A transition from transgranular cracking to void coalescence was noted, and the mechanism mapped, both onto the results obtained in this work and the existing literature. Additionally, overload experiments aided in describing stress relaxation as the dominant transgranular mechanism governing crack growth below Kth, the sustained load crack growth threshold stress intensity factor, which is also reported herein.
  • KEYWORDS: Constant Amplitude, Fracture Mechanics, Stress Relaxation, Creep-Fatigue, EDS, Fractography, Time-Dependent, Creep Zone, Void Coalescence, Transition Time, Oxygen, Electro Potential Drop, Sustained Load Crack Growth Threshold, Stress Intensity, Creep-Ductile, Force Line Displacement
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