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In situ x-ray observation of bainitic transformation of austempered silicon alloyed steel

Published online by Cambridge University Press:  31 January 2011

Xiang Chen  and
Esa Vuorinen
Xiang Chen*
Affiliation:
Division of Engineering Materials, Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden; and Key Laboratory for Advanced Materials Processing Technology, Ministry of Education of China, Department of Mechanical Engineering, Tsinghua University, 100084 Beijing, China
Esa Vuorinen
Affiliation:
Division of Engineering Materials, Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden
*
a) Address all correspondence to this author. \e-mail: xchen@mail.tsinghua.edu.cn
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Abstract

The in situ x-ray diffraction observations of the bainitic transformation were conducted by using the high-temperature x-ray diffraction technique. The volume fraction and carbon content of austenite depend on the transformation temperature. The d{110} value of bainitic ferrite decreases with increasing austempering temperature, which is related to the decrease of carbon concentration in bainitic ferrite. Asymmetry diffraction peaks are obtained for samples at the early stage of transformation at any austempering temperatures. This asymmetry diffraction peak after the formation of bainitic ferrite could be attributed to a heterogeneous distribution of carbon in different regions of austenite and show that two types of austenite with different carbon contents, low-carbon austenite (γLC) and the high-carbon austenite (γHC), exist during the transformation. The microstructure after cooling down to room temperature is presented to show the effectiveness of the x-ray diffraction analysis.

Keywords

AlloySteelX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1559 - 1566
Copyright
Copyright © Materials Research Society 2009

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