Block and sub-block boundary strengthening in lath martensite

SCRIPTA MATERIALIA

卷:116

Article

Du, C.¹  Hoefnagels, J. P. M.¹  Vaes, R.¹  Geers, M. G. D.¹ 

[1] Eindhoven Univ Technol, Dept Mech Engn, POB 513, NL-5600 MB Eindhoven, Netherlands

关键词: Lath martensite;    Boundaries;    Strengthening mechanism;    Uniaxial micro-tensile test;   

DOI  :  10.1016/j.scriptamat.2016.01.043

来源: Elsevier

【 摘 要 】

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. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free