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Dilatometric determination of four critical temperatures and phase transition fraction for austenite decomposition in hypo-eutectoid steels using peak separation method

Published online by Cambridge University Press:  08 February 2018

Tao Liu ,
Mujun Long ,
Helin Fan ,
Dengfu Chen ,
Huabiao Chen ,
Huamei Duan ,
Wenxiang Jiang  and
Wenjie He
Tao Liu
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Mujun Long*
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Helin Fan
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Dengfu Chen*
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Huabiao Chen*
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Huamei Duan
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Wenxiang Jiang
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Wenjie He*
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

This work was aimed to use the peak separation method to directly measure the critical temperatures and phase transition fractions of austenite decomposition products based on experimental dilatometric curves in hypo-eutectoid steels. The results indicated that pearlite transformation start temperature and ferrite transformation finish temperature could be clearly obtained through peak separation processing, which were generally hidden in the overlapped peaks of the linear thermal expansion coefficient curve. Moreover, four critical temperatures of austenite decomposition were retarded to lower temperature with cooling rate increasing. The phase transition fraction for austenite decomposition was quantitated by measuring the area of the corresponding phase transformation peak. The final ferrite phase fraction after austenite decomposition decreased with cooling rate increasing. On the contrary, the final pearlite phase fraction increased with cooling rate increasing. Compared with the lever rule, the calculation result using peak area method can accurately reflect the actual phase fraction change versus the temperature during austenite decomposition.

Keywords

hypo-eutectoid steelsaustenite decompositioncritical temperaturesphase fraction
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 8 , 27 April 2018 , pp. 967 - 977
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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