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The present work discusses the micro-mechanism of low cycle fatigue (LCF)crack growth in smooth bar specimens of Haynes 282. Two parametric approaches,i.e. crack tip opening angle (CTOA) and maximum tangential stress ({\theta}MTS)have been opted to characterize the cracks. CTOA variations along with apropagating crack, exhibit a non-linear decay followed by a stabilized regime.Mixicity of local KI and KII fields is directly proportional to {\theta}MTS andthat can be assessed by measuring local deflections. Around the crack, the roleof grain incompatibility has been addressed through EBSD and slip transferanalysis. There is a critical bound for Elastic Modulus (EM) and Schmid factor(SF) for the grains favouring subsurface crack propagation, and these valuesexist beyond a limiting threshold. The SF-EM maps mark the regions of crackedand uncracked grains in the material. The favourable twin-matrixincompatibility of the microstructure has also been identified about thefatigue crack growth and twins in (211) plane is abundant in the crackedregion. A detailed slip transfer analysis based on the Luster-Morris parameter(LMP) has been carried out for investigating the interrelation between slipactivity, elasto-plastic incompatibility, and grain boundary geometry.

Crystallographic evaluation of low cycle fatigue crack growth in a polycrystalline Ni based superalloy