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Novel ultrahigh-strength nanolath martensitic steel by quenching–partitioning–tempering process

Published online by Cambridge University Press:  31 January 2011

X.D. Wang
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
N. Zhong
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Y.H. Rong*
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
T.Y. Hsu (Z.Y. Xu)
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
L. Wang
Affiliation:
Baosteel Research and Development Technology Center, Shanghai 201900, China
*
a) Address all correspondence to this author. e-mail: yhrong@sjtu.edu.cn
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Abstract

A modified heat treatment process designated quenching–partitioning–tempering (Q–P–T) process is developed based on the quenching and partitioning process proposed by J.G. Speer et al. [Acta Mater.51, 2611 (2003)] and D.K. Matlock et al. [Mater. Sci. Forum426–432, 1089 (2003)]. A Fe–0.485C–1.195Mn–1.185Si–0.98Ni–0.21Nb steel after Q–P–T process satisfies the designed requirement of tensile strength over 2000 MPa and elongation over 10%. The microstructure characterization indicates that this ultrahigh-strength steel consists of nanomicrostructures including lath martensite, filmlike retained austenite, and dispersive Nb-containing carbides. The effect of tempering time on the mechanical properties is analyzed based on microstructures.

Type
Articles
Copyright
Copyright © Materials Research Society 2009

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References

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