Bulk Nanocrystalline Ferrite Stabilized through Grain Boundary Carbon Segregation

2018 ◽  
Vol 20 (10) ◽  
pp. 1800443 ◽  
Author(s):  
Yulia Ivanisenko ◽  
Xavier Sauvage ◽  
Andrei Mazilkin ◽  
Askar Kilmametov ◽  
John A. Beach ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Carbon Segregation ◽  
Bulk Nanocrystalline ◽  
Nanocrystalline Ferrite

scholarly journals Grain Boundary Pop-in, Yield Point Phenomenon and Carbon Segregation in Aged Low Carbon Steel

2018 ◽  
Vol 58 (2) ◽  
pp. 373-375 ◽  
Author(s):  
Zhengyan Shen ◽  
Bilei Wang ◽  
Gaofei Liang ◽  
Yunhu Zhang ◽  
Ke Han ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Grain Boundary ◽  
Yield Point ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Carbon Segregation ◽  
Yield Point Phenomenon

Grain Boundary Carbon Segregation Estimated by McLean and Seah-Hondros Models

2011 ◽  
pp. 81-86
Author(s):  
Setsuo Takaki ◽  
Nobuo Nakada ◽  
Toshihiro Tsuchiyama
Keyword(s):  
Grain Boundary ◽  
Carbon Segregation

Influence of Impurities on Grain Boundaries Cohesion in B2-TiMe

2016 ◽  
Vol 258 ◽  
pp. 110-113
Author(s):  
Svetlana Kulkova ◽  
Alexander Bakulin ◽  
Sergey Kulkov
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
First Principles ◽  
Carbon Segregation ◽  
Accumulation Effect ◽  
Symmetrical Tilt ◽  
Pseudopotential Approach ◽  
Influence Of Impurities ◽  
Substitutional Impurities

The effect of interstitial and substitutional impurities on grain boundary (GB) cohesion in the series of B2-TiMe alloys is studied from first principles using pseudopotential approach. It is shown that the TiMe Σ5(310) symmetrical tilt GB cohesion is reduced by the segregation of hydrogen while it is increased due to boron or carbon segregation. We analyze also the combined and accumulation effect of interstitial B (C) and H impurities on the change of the Griffith work.

Effect of Grain Size and Annealing Condition on Grain Boundary Segregation of Carbon Atoms in ULC Steel

2013 ◽  
Vol 302 ◽  
pp. 286-291
Author(s):  
Yan Cui ◽  
Ai Min Ji ◽  
Yun Li Feng ◽  
Rui Zhen Wang ◽  
Qi Long Yong
Keyword(s):  
Grain Size ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Annealing Condition ◽  
Bake Hardening ◽  
Cooling Rates ◽  
Carbon Segregation

The grain boundary segregation of carbon atoms is influenced by grain size and annealing condition. Increasing grain size and improving the final cooling ( ＜400 oC) rate can improve the bake hardening property, due to the decreasing of carbon segregation at grain boundaries. Cooling rates have a great effect on bake hardening property of ULC steel with smaller grains

Grain Boundary Internal Friction Peak in Nanocrystalline Aluminum Studied by Continuously Changing-Temperature

2014 ◽  
Vol 1004-1005 ◽  
pp. 3-9
Author(s):  
Jian Ning Wei ◽  
Li Ling Zhou ◽  
Jian Qiang Liu ◽  
Xue Yun Zhou ◽  
Wei Jun Xie
Keyword(s):  
Internal Friction ◽  
Grain Boundary ◽  
Dynamic Modulus ◽  
Vibration Measurement ◽  
Heating Process ◽  
Internal Friction Peak ◽  
Low Frequencies ◽  
Exponential Factor ◽  
Nanocrystalline Aluminum ◽  
Bulk Nanocrystalline

The bulk nanocrystalline aluminum are fabricated by cryomilling and hot-press sintering. The internal friction (IF) and relative dynamic modulus measurements in the nanocrystalline aluminum (Al) have been made using a multifunction internal friction apparatus (MFIFA) at low frequencies (0.2-3.0 Hz) over the wide temperature ranges from room temperature to 450 °C, while continuously changing-temperature forced vibration measurement. In the temperature spectrums of IF during heating process and cooling process, a distinct IF peak is found. Corresponding to the IF peak, the relative dynamic modulus decreases rapidly. The peak temperature of the IF peak shifts towards higher temperature with increasing frequency, i.e., the IF peak seem due to the thermal activated relaxation process. The IF peak is a grain boundary IF peak, which is associated with the diffusive grain boundary of Al/Al. Its activation energy has been calculated to be 2.21±0.04×10-19J and the pre-exponential factor is 10-14s in IF measurements.

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