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Effects of precipitated phase and order degree on bending properties of an Fe-6.5 wt%Si alloy with columnar grains

Published online by Cambridge University Press:  04 July 2011

Huadong Fu ,
Qiang Yang ,
Zhihao Zhang  and
Jianxin Xie
Huadong Fu
Affiliation:
Advanced Materials and Technology Institute, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Qiang Yang
Affiliation:
Advanced Materials and Technology Institute, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Zhihao Zhang
Affiliation:
Advanced Materials and Technology Institute, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China; and State Key Lab for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Jianxin Xie*
Affiliation:
Advanced Materials and Technology Institute, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China; and State Key Lab for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: jxxie@mater.ustb.edu.cn
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Abstract

Effects of the precipitated phase and the ordered phase domain of an Fe-6.5 wt%Si alloy before and after heat treatment on the bending properties were investigated in this study. The results showed that original needle-like phases were spheroidized after the heat treatment at 900 °C for 1 h followed by slow or rapid cooling. Compared with the directional solidified sample, the slow cooling sample had a higher order degree, whereas the rapid cooling samples had a lower order degree. After rapid cooling heat treatment, the fracture deflection of the sample was increased by 73.8%. Fracture analysis showed that transition from quasi-cleavage fracture to tear pit-like fracture took place in the rapid cooling sample. The bending properties of the Fe-6.5 wt%Si alloy were improved mainly due to the changes in morphology and amount of the precipitated phase as well as the reduction of order degree.

Keywords

Zone meltingTransmission electron microscopySecond phases
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 14 , 28 July 2011 , pp. 1711 - 1718
Copyright
Copyright © Materials Research Society 2011

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