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

Copyright © Materials Research Society 2009

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