Block and sub-block boundary strengthening in lath martensite

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Well-defined uniaxial micro-tensile tests were performed on lath martensite single block specimens and multi-block specimens with different number of block boundaries parallel to the loading direction. Detailed slip trace analyses consistently revealed that in 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 indicates that dislocation motion can cross sub-block boundaries but not block boundaries.
Original languageEnglish
Pages (from-to)117-121
Number of pages5
JournalScripta Materialia
Publication statusPublished - 15 Apr 2016


  • Boundaries
  • Lath martensite
  • Strengthening mechanism
  • Uniaxial micro-tensile test


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