Premium
Microstructural‐based strain accumulation during cyclic loading of Ni‐based superalloys: The role of neighboring grains on interconnected slip bands
Author(s) -
Rotella John,
Sangid Michael D.
Publication year - 2020
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.13257
Subject(s) - slip (aerodynamics) , materials science , digital image correlation , crystallite , lüders band , superalloy , strain (injury) , composite material , metallurgy , microstructure , thermodynamics , medicine , physics
Abstract Cyclic loading of polycrystalline materials results in the localization of strain relative to microstructural features. In this work, strains characterized from digital image correlation were used to calculate a value for the incremental slip on the active slip systems and identify cases of slip transmission. Interconnected slip bands, between neighboring grains, were shown to accumulate more incremental slip (and associated strain) compared with slip bands confined to a single grain, where slip transmission did not occur. These results rationalize the role of grain clusters leading to intense strain accumulation and thus serving as potential sites for fatigue crack initiation.