Abstract
Well-defined uniaxial micro-tensile tests were performed on lath martensite single block specimens and multi-block specimens with different numbers of block boundaries parallel to the loading direction. Detailed slip trace analyses consistently revealed that the {110}<111> slip system with the highest Schmid factor is activated. Both block and sub-block boundaries act as barriers to dislocation motion, whereby a Hall–Petch like behavior is observed. Sub-block boundary strengthening appears to be only slightly less effective than block boundary strengthening, even though fracture analyses indicate that dislocation motion can cross sub-block boundaries, but not block boundaries.
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