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Effect of austenitic state on microstructure and mechanical properties of martensite/bainite steel

Published online by Cambridge University Press:  25 March 2014

Lei Tian ,
Qing Ao  and
Shengli Li
Lei Tian
Affiliation:
School of Materials Science and Engineering, Shandong University, Ji’nan 250061, China
Qing Ao
Affiliation:
School of Materials Science and Engineering, Shandong University, Ji’nan 250061, China
Shengli Li*
Affiliation:
School of Materials Science and Engineering, Shandong University, Ji’nan 250061, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Various heat treatments and thermal simulation with different austenitizing temperatures and austenite deformation were applied on a bearing steel to obtain various austenitic state. The effect of austenitic state on microstructure of martensite/bainite (M/B) dual phase steel and its mechanical property has been investigated via microstructure observation and kinetic analysis. The results show that the M/B steels austenitized at 900 and 950 °C have better comprehensive performance compared with the steels austenitized at 850 and 1050 °C. The refined microstructure can be obtained after deformation, and the heavy deformation and low deformation temperature are useful for refining the microstructure. The bainite lath is longer and has well-directional arrangement at high austenitizing temperature with the same deformation. Furthermore, austenite deformation can improve the nucleation ratio, reduce incubation process, and affect the kinetics of bainite transformation significantly.

Keywords

austenitizing temperatureaustenite deformationbainiteimpact toughness
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 7 , 14 April 2014 , pp. 887 - 895
Copyright
Copyright © Materials Research Society 2014 

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