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Effect of intercritical temperature on quenching and partitioning steels originated from martensitic pre-microstructure

Published online by Cambridge University Press:  20 October 2014

Ran Ding ,
Di Tang ,
Aimin Zhao ,
Rui Dong ,
Junye Cheng  and
Xiang Meng
Ran Ding
Affiliation:
Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, People's Republic of China; Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Beijing 100083, People's Republic of China; and National Engineering Research Center of Advanced Rolling, Beijing 100083, People's Republic of China
Di Tang
Affiliation:
Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, People's Republic of China; Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Beijing 100083, People's Republic of China; and National Engineering Research Center of Advanced Rolling, Beijing 100083, People's Republic of China
Aimin Zhao*
Affiliation:
Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, People's Republic of China; Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Beijing 100083, People's Republic of China; and National Engineering Research Center of Advanced Rolling, Beijing 100083, People's Republic of China
Rui Dong
Affiliation:
Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
Junye Cheng
Affiliation:
Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
Xiang Meng
Affiliation:
Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
*
a)Address all correspondence to this author. e-mail: aimin.zhao@ustb.edu.cn
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Abstract

The effect of the intercritical temperature on the microstructure and mechanical properties of a newly developed quenching and partitioning steel using martensitic microstructure prior to the heat treatment process was studied. Such a quenching and partitioning process possessed a unique microstructure evolution, especially during intercritical annealing after prequenching. Excellent mechanical properties were obtained due to this unique multiphase microstructure. Significant amount of interlath-retained austenite was acquired and the relationship between the microstructure and work-hardening behaviors was proposed. The martensite/austenite islands increased at elevated annealing temperature, which deteriorated the total elongation and increased the tensile strength as hard constituents when it was excessive. The result indicated that the present full martensitic microstructure before the intercritical annealing is probably more suitable to an industrial application and is a better way to produce high strength steels with suitable ductility.

Keywords

steelmicrostructuresecond phases
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 21 , 14 November 2014 , pp. 2525 - 2533
Copyright
Copyright © Materials Research Society 2014 

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References

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