Nano-Scale Analysis of Nano-Bainite Formed in Advanced High Strength Steels
|Periodical||Materials Science Forum (Volumes 654 - 656)|
|Edited by||Jian-Feng Nie and Allan Morton|
|Citation||Ilana B. Timokhina et al., 2010, Materials Science Forum, 654-656, 102|
|Online since||June 2010|
|Authors||Ilana B. Timokhina, Hossein Beladi, Xiang Yuan Xiong, Elena V. Pereloma, Peter D. Hodgson|
|Keywords||Atom Probe Tomography (APT), Nano-Bainite, Retained Austenite, TEM, Transformation Induced Plasticity (TRIP)|
The effect of composition and processing schedule on the microstructure of C-Mn-Si-Mo-(Al)-(Nb) steels containing nano-bainite was studied using transmission electron microscopy (TEM) and atom probe tomography (APT). The major phase formed in all steels was nano-bainite. However, the steels with lower carbon and alloying addition content subjected to TMP had better mechanical properties than high alloyed steel after isothermal treatment. The presence of ferrite in the microstructure can improve not only ductility but lead to the formation of retained austenite with optimum chemical stability.