Analysis of tensile deformation behavior of AM2B (R) advanced high-strength steel using electron back-scattered diffraction technique

作者：Askari Paykani Mohsen; Shahverdi Hamid Reza^*; Miresmaeili Reza; Beladi Hossein

来源：Materials Characterization, 2017, 130: 64-73.

DOI：10.1016/j.matchar.2017.05.033

• Austenite
• M2B
• Interrupted tensile test
• EBSD analysis
• Deformation mechanisms

The microstructure evolution of a novel advanced high-strength steel (AM2B (R) = austenite + (Fe,Cr)(2)B) subjected to room-temperature interrupted uniaxial tensile test was investigated in relation to the mechanical behavior. This steel showed both high ductility and strength, with yield stress of 357 MPa, ultimate tensile strength of 702 MPa, and total elongation as high as 42%. Electron back-scattered diffraction analysis showed that the high formability (29.4 GPa%) of the current steel was mostly due to energy dissipation mechanisms such as (1) formation and rearrangement of geometrically necessary dislocations (GNDs), (2) activation of mechanical nanotwins, (3) grain rotation, and (4) void nucleation and growth. It was found that GND rearrangement mostly occurred in the true strain range of 0.13-0.25, and void nucleation and growth were the most influential mechanisms in the true strain range of 0.25-0.37. Moreover, it was found that the constraint effect of M2B phases may accelerate softening (grain rotation) and mechanical nanotwinning.

• 出版日期2017-8
• 单位迪肯大学