Crack Propagation: Microstructural Aspects

This chapter contains sections titled: Special Features of the Propagation of Microstructurally Short Fatigue Cracks Definition of Short and Long Cracks Transgranular Crack Propagation Crystallographic Crack Propagation: Interactions with Grain Boundaries Mode I Crack Propagation Governed by Cyclic Crack-Tip Blunting Influence of Grain Size, Second Phases and Precipitates on the Propagation Behavior of Microstructurally Short Fatigue Cracks Significance of Crack-Closure Effects and Overloads General Idea of Crack Closure During Fatigue-Crack Propagation Plasticity-Induced Crack Closure Influence of Overloads in Plasticity-Induced Crack Closure Roughness-Induced Crack Closure Oxide- and Transformation-Induced Crack Closure ΔK*/K*max Thresholds: An Alternative to the Crack-Closure Concept Development of Crack Closure in the Short Crack Regime Short and Long Fatigue Cracks: The Transition from Mode II to Mode I Crack Propagation Development of the Crack Aspect Ratio a/c Coalescence of Short Cracks Intercrystalline Crack Propagation at Elevated Temperatures: The Mechanism of Dynamic Embrittlement Environmentally Assisted Intercrystalline Crack Propagation in Nickel-Based Superalloys: Possible Mechanisms Mechanism of Dynamic Embrittlement as a Generic Phenomenon: Examples Oxygen-Induced Intercrystalline Crack Propagation: Dynamic Embrittlement of Alloy 718 Increasing the Resistance to Intercrystalline Crack Propagation by Dynamic Embrittlement: Grain-Boundary Engineering