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Superplasticity of Ultra-High Carbon Steels Containing 3-5%Aluminum

Published online by Cambridge University Press:  16 February 2011

Dong-Wha Kum ,
Hyung Kang  and
Tong-Hoon Kim
Dong-Wha Kum
Affiliation:
Korea Institute of Science and Technology, Div. of Metals, P.O. Box 131, Cheongryang, Seoul Korea
Hyung Kang
Affiliation:
Seoul National Univesity, Dept. of Metallurgical Engineering, San 56-1, Kwanakgu, Seoul Korea
Tong-Hoon Kim
Affiliation:
Seoul National Univesity, Dept. of Metallurgical Engineering, San 56-1, Kwanakgu, Seoul Korea
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Abstract

To study the effect of Al on superplasticity of ultra-high carbon steel (UHCS), 3–5%Al was added to the UHCS, and superplastic behavior was measured at 700–800°C. To produce the fine and superplastic microstructure, an isothermal rolling at 700°C was used, and the grain size of ferrite was less than about 2μm in diameter after the process.

Significant improvement in superplasticity was observed; the strain-rate sensitivity was high upto a strain-rate of 10−2 s−1, and 402% elongation was measured at 750°C and at an engineering strain-rate of 5000%/min(i.e., 8.3×10−2s−1). It has been determined that the Al-addition leads to a finer grain size, which, in turn, improved the superplastic properties of the ultra-high carbon steels.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 209
Copyright
Copyright © Materials Research Society 1990

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References

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