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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
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.

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Articles
Copyright
Copyright © Materials Research Society 2011

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