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Evolution of microstructure and mechanical properties of a new high strength steel containing Ce element

Published online by Cambridge University Press:  26 October 2017

Yanru Huang ,
Xin Jin  and
Guojun Cai
Yanru Huang*
Affiliation:
College of Science, Liaoning Shihua University, Fushun 113001, China
Xin Jin
Affiliation:
College of Science, Liaoning Shihua University, Fushun 113001, China
Guojun Cai
Affiliation:
College of Science, Liaoning Shihua University, Fushun 113001, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

In the present work, the evolution of microstructure and mechanical properties of high-strength low-alloy D6AC steel containing the Ce element was synthetically investigated by means of electron backscatter diffraction, scanning electron microscope, Transmission electron microscope, and tensile and impact tests. The experimental results show that adding a certain amount of Ce into HSLA-D6AC steel can refine grains and martensite laths, as well as increase the fine VC precipitates, which not only enhance the strength of the steel but also improve the toughness and plasticity. Meanwhile, the morphology of martensite in HSLA-D6AC steel changes from twin martensite to dislocation martensite. It is found that after adding Ce, HSLA-D6AC steel exhibits a distinct necking stage in the tensile test, and the impact toughness value increases from 83 to 136 J. With the appearance of some more and deeper homogeneous dimples, the quasi-cleavage fracture transforms into a ductile fracture characterized by microvoid coalescence, demonstrating that HSLA-D6AC steel with the Ce element achieves excellent comprehensive mechanical properties.

Keywords

high-strength low-alloy(HSLA)steelCeVC precipitatestwin martensitedislocation martensite
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 20 , 27 October 2017 , pp. 3894 - 3903
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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