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On-line Access: 2010-10-05

Received: 2010-04-16

Revision Accepted: 2010-08-27

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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.10 P.776-781

http://doi.org/10.1631/jzus.A1000147


Effect of direct quenching on microstructure and mechanical properties of medium-carbon Nb-bearing steel


Author(s):  Ying-li Zhao, Jie Shi, Wen-quan Cao, Mao-qiu Wang, Gang Xie

Affiliation(s):  School of Material and Metallurgy Engineering, Kunming University of Science and Technology, Kunming 650093, China, Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China

Corresponding email(s):   zhaoyingli@nercast.com

Key Words:  Direct quenching (DQ), Block, Mechanical properties, Electron backscattering diffraction (EBSD), Nb steel


Ying-li Zhao, Jie Shi, Wen-quan Cao, Mao-qiu Wang, Gang Xie. Effect of direct quenching on microstructure and mechanical properties of medium-carbon Nb-bearing steel[J]. Journal of Zhejiang University Science A, 2010, 11(10): 776-781.

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author="Ying-li Zhao, Jie Shi, Wen-quan Cao, Mao-qiu Wang, Gang Xie",
journal="Journal of Zhejiang University Science A",
volume="11",
number="10",
pages="776-781",
year="2010",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1000147"
}

%0 Journal Article
%T Effect of direct quenching on microstructure and mechanical properties of medium-carbon Nb-bearing steel
%A Ying-li Zhao
%A Jie Shi
%A Wen-quan Cao
%A Mao-qiu Wang
%A Gang Xie
%J Journal of Zhejiang University SCIENCE A
%V 11
%N 10
%P 776-781
%@ 1673-565X
%D 2010
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1000147

TY - JOUR
T1 - Effect of direct quenching on microstructure and mechanical properties of medium-carbon Nb-bearing steel
A1 - Ying-li Zhao
A1 - Jie Shi
A1 - Wen-quan Cao
A1 - Mao-qiu Wang
A1 - Gang Xie
J0 - Journal of Zhejiang University Science A
VL - 11
IS - 10
SP - 776
EP - 781
%@ 1673-565X
Y1 - 2010
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1000147


Abstract: 
The influence of direct quenching (DQ) on microstructure and mechanical properties of 0.19C-1.7Si-1.0 Mn-0.05nb steel was studied. The microstructure and mechanical properties of reheat quenched and tempered (RQ&T) steel plate were compared with those of direct quenched and tempered (DQ&T) steel plates which were hot rolled at different finish rolling temperatures (1173 K and 1123 K), i.e., recrystallization-controlled-rolled direct-quenched (RCR&DQ) and controlled-rolled direct-quenched (CR&DQ), respectively. The strengths generally increased in the following order: RQ&T<RCR&DQ&T< CR&DQ&T. Strength differences between the CR&DQ&T and RQ&T conditions as high as 14% were observed at the tempered temperature of 573 K. The optical microscopy of the CR&DQ&T steel showed deformed grains elongated along the rolling direction, while complete equiaxed grains were visible in RQ&T and RCR&DQ&T steels. Transmission electron microscopy (TEM) and electron backscattering diffraction (EBSD) of the DQ steels showed smaller block width and higher density of dislocations. Inheritance of austenite deformation substructure by the martensite and differences in martensite block width were ruled out as major causes for the strength differences between DQ and RQ steels.

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Reference

[1]Chang, W.S., 2002. Microstructure and mechanical properties of 780 MPa high strength steel produced by direct-quenching and tempering process. Journal of Materials Science, 37(10):1973-1979.

[2]Kitahara, H., Ueji, R., Tsuji, N., Minamino, Y., 2006. Crystallographic features of lath martensite in low-carbon steel. Acta Materialia, 54(5):1279-1288.

[3]Krauss, G., 1999. Martensite in steel: strength and structure. Metallurgical and Materials Transactions A, 273-275: 40-57.

[4]Mekkawy, M.F., Fawakhry, K.A., Mishreky, M.L., Eissa, M.M., 1990. Direct quenching of low manganese steels microalloyed with vanadium or titanium. Iron and Steelmaker, 10:75-88.

[5]Morikawa, H., Hasegawa, T., 1986. Microstructures and Strengthening Factors of Accelerated Cooled Steel. Proceedings of International Symposium on Accelerated Cooling of Steel, Warrendale, USA, p.83-96.

[6]Morito, S., Yoshida, H., Maki, T., Huang, X., 2006. Effect of block size on the strength of lath martensite in low carbon steels. Materials Science and Engineering: A, 25(438-440):237-240.

[7]Sugden, A.A.B., Bhadeshia, H.K.D.H., 1988. A model for the strength of the as-deposited regions of steel weld metals, Metallurgical and Materials Transactions A, 19(6):1597-1602.

[8]Taylor, K.A., Hansen, S.S., 1988. Structure and Properties of Some Directly-quenched Martensitic Steels. Proceedings of the International Symposium on Accelerated Cooling of Rolled Steel, Elmsford, USA, p.85-101.

[9]Taylor, K.A., Hansen, S.S., 1990. The Boron hardenability effect in thermomechanically processed, direct-quenched 0.2 Pct C steels, Metallurgical and Materials Transactions A, 21(6):1697-1708.

[10]Taylor, K.A., Hansen, S.S., 1991. Effects of vanadium and processing parameters on the structures and properties of a direct-quenched low-carbon Mo-B steel. Metallurgical and Materials Transactions A, 22(10):2359-2374.

[11]Wang, C.F., Wang, M.Q., Shi, J., Hui, W.J., Dong, H., 2007. Microstructural characterization and its effect on strength of low carbon martensitic steel. Iron and Steel, 42(11):57-60 (in Chinese).

[12]Weiss, R.K., Thompson, S.W., 1992. Strength Differences between Direct Quenched and Reheated and Quenched Plate Steels. Proceedings of the Symposium on Physical Metallurgy of Direct-quenched Steels, Warrendale, USA, p.107-138.

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