An approach to define the effective lath size controlling yield strength of bainite

作者：Zhu Kangying^*; Bouaziz Olivier; Oberbillig Carla; Huang Mingxin

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2010, 527(24-25): 6614-6619.

DOI：10.1016/j.msea.2010.06.061

• Ultra-low carbon bainitic steels
• Lath misorientation
• Lath size
• Electron backscattering diffraction (EBSD)
• Yield stress

A fully bainitic microstructure with negligible carbide precipitation is obtained in two ultra-low carbon steels. The size and misorientation of bainite laths are analysed by Electron Back Scattering Diffraction (EBSD). It is found that the yield stress of bainite is proportional to the inverse lath size defined with low boundary misorientation (2-7 degrees). This can be explained by a theory predicting the flow stress of deformed metals, assuming that both lath boundary and dislocation cell boundary have similar capability of being dislocation obstacles.

• 出版日期2010-9-25
• 单位香港大学