Statistics of misorientation across grain boundaries in nanostructured Fe-Ni-Mn steel prepared by cold rolling and annealing of lath martensite

Syamak Hossein Nedjad 1Hassan Shirazi 2Mahmoud Nili Ahmadabadi 2

1. Sahand University of technology (SUT), Sahand New Town, Tabriz, Iran, Tabriz 51335-1996, Iran
2. University of Tehran (UT), North-Kargar, Tehran 14395-731, Iran

Abstract

Nanostructured Fe-Ni-Mn steel was prepared by heavy cold rolling and isothermal aging of lath martensite. Kikuchi patterns obtained by convergent-beam electron diffraction analysis was used to study the statistics of misorientation across grain boundaries. It was found out that high fraction of grain boundaries are high angle. However, low angle boundaries were also indicated frequently. The evolution of the misorientation statistics was studied during isothermal aging to outline the mechanism of ultrafine grain formation. It is found out that the statistics of misorientation is unlikely to substantially change with aging time. Following that, it is assumed random nucleation of new grains is unlikely to occur during aging and, subsequently, ultrafine grains along with misorientation statistics are inherited from deformed structure.

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium J, by Hassan Shirazi
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-08-12 12:59
Revised:   2009-06-07 00:44
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