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A Study on Precipitation in Clean Micro Alloyed Steels

Published online by Cambridge University Press:  02 July 2020

Yuanli Wang ,
Delu Liu ,
Jie Fu  and
Jian Zhu
Yuanli Wang
Affiliation:
Department of Material Physics and Chemistry, University of Science and Technology, Beijing
Delu Liu
Affiliation:
Department of Material Physics and Chemistry, University of Science and Technology, Beijing
Jie Fu
Affiliation:
Metallurgy School, University of Science and Technology Beijing, 100083, Beijing, China
Jian Zhu
Affiliation:
Metallurgy School, University of Science and Technology Beijing, 100083, Beijing, China
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Abstract

Much attention has been devoted to develop the new generation of microalloyed steels in recent years to meet the needs of high performance and low cost for the 21st century. The new type of steels is characterized by reduced carbon content, improved cleanness and refined grain size through the phase transformations.11'21 Precipitation of the carbonitrides in the steels is also one of the keypoints for controlling mechanical properties of the steels.

In the present work ultra-low carbon clean microalloyed steels, which contain 0.029∽0.047(wt)%C, 1.48∽1.54(wt)% Mn, 0.044∽0.052(wt)%Nb, 0.025∽0.044Ti(wt)%, 0.0015∽0.0020(wt)%B and 0.0045∽0.0070(wt)%N, were prepared in a vacuum induction furnace in laboratory. The contents of S and P of the steels are 0.0005(wt)% and 0.0010∽0.0024(wt)% respectively. Total amount of the impurity elements O, S, P and H in the steels is 0.0061∽0.0077%. Dominant component of the structure in both casting and as-forged samples is acicular ferrite or bainite.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1264 - 1265
Copyright
Copyright © Microscopy Society of America 2001

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References

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