Micromechanical characterization of deformation behavior in ferrous lath martensite

作者：Shibata Akinobu^*; Nagoshi Takashi; Sone Masato; Higo Yakichi

来源：Journal of Alloys and Compounds, 2013, 577: S555-S558.

DOI：10.1016/j.jallcom.2012.01.066

• Metals and alloys
• Grain boundaries
• Mechanical properties
• Microstructure

Local deformation behavior around the block boundary of lath martensite structure was studied through a micro-bending test and microstructural observation. When the misorientation of operated slip systems across the block boundary is small, the relief corresponding to the block boundary appeared by deformation. This suggested that the slip transferred directly across the block boundary. In the case of the large misorientation of operated slip systems across the block boundary, however, there is no evidence that slips were transferred directly across the block boundary. The small misorientation of operated slip systems across the block boundary also induced the obvious load drop in the load-displacement curve of micro-bending test. We considered that the flow stress at the region above the block boundary was decreased due to the transfer of pile-up dislocations across the block boundary after reaching some critical stress, resulting in the load drop in the load-displacement curve.

• 出版日期2013-11-15