The role of sub-structure boundaries on lath martensite plasticity

Abstract eng:
Well-defined uniaxial micro-tensile tests were performed on lath martensite with two configurations. In the first configuration, boundaries are parallel to loading direction. Boundaries play a role of strengthening by hampering crystallographic slip and it was found that the effect of sub-block boundary is only slightly lower than that of block boundaries. The difference between them is that sub-block boundary cannot capture the fracture surface while block boundary is capable of stopping fractures. In the second configuration, samples have tilted boundaries to the loading direction. Sliding of the substructures occurs at all types of boundaries, e.g. block, sub-block and lath boundaries at relatively lower stresses. Thus the boundaries does not only strengthen the materials, but also mitigate the plastic deformation. In addition, sliding mechanism is in competition with crystallographic slip to carry overall plastic deformation.

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