High temperature fatigue propagation in astroloy a nickel-base superalloy

The process metallurgy and physical metallurgy of astroloy -- Powder metallurgy processing -- Chemical composition and element function -- Heat treatment and microstructure -- Fatigue crack propagation at high temperature in astroloy -- Deformation and fracture mechanisms -- Factors influencing fatigue crack propagation -- Crack length measurement techniques -- Optical method -- Eddy current method -- Strain gauge filaments method -- Ultrasonic method -- Acoustic emission method -- Compliance methods -- Potential drop methods -- ac potential drop -- dc potential drop -- Experimental procedures -- Test apparatus -- Testing materials -- Loading conditions -- Crack length measurement -- Software control -- Data processing -- Fractography and microstructure characterization -- Experimental results -- Calibration curves -- FCPR expressions -- Data processing -- Paris relation and coefficients -- Weibull equation and coefficients -- Applied stresses Versus the number of flights to failure -- Temperature effects -- Holf time effects -- Minor cycle load ratio effects -- Fractography and microstructure. Fractography -- Secondary crack observations -- Microstructure observations -- Discussion -- Fractography morphology for room and high temperature tests -- High temperature FCP behaviour -- Influence of hold time on FCP behaviour -- Influence of minor cycle of load range on FCP behaviour -- Influence of microstructure on FCP behaviour.