Electron channeling studies of local surface deformation in HSLA steel

Abstract

The deformation process in high strength low-alloy (HSLA) steel has been investigated using transmission and scanning electron microscopy. Electron channeling contrast and selected area channeling pattern (SACP) techniques reveal microscopic orientation changes developing during deformation by tension. Theoretical modeling involves an accounting procedure based on dislocations emanated at grain boundary sources. This has shown that a length scale (subcell diameter) might be utilized to predict strain-hardening behavior with a dislocation source length coefficient of ~ 2.2 and Taylor work hardening coefficient, a = 0.44.