ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Mechanism of Microstructural Control and Mechanical Properties in Hot Rolled Plain C–Mn Steel during Controlled Cooling
Chengning LiGuo YuanFengqin JiJian KangDevesh MisraGuodong Wang
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2015 Volume 55 Issue 8 Pages 1721-1729

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Abstract

In this study, plain C–Mn steels with different ferrite grain size were obtained through various thermo-mechanical processing. Fast cooling suppressed ferrite transformation at high temperature, but promoted ferrite nucleation at low temperature and restricted ferrite grain growth. The microstructure and mechanical properties were governed by the combined effects of cooling rate and cooling temperature. A new thermo-mechanical controlled processing (TMCP) based on ultra fast cooling (UFC) technology was adopted to increase the strength of plain C–Mn steel strips. The new TMCP approach involving UFC enabled significantly finer grain size to be obtained in relation to conventional TMCP. The grain size of Fe-0.17C-0.33Mn steel strips obtained by the new TMCP was refined to ~3–4 µm, and both yield strength and tensile strength were increased by 60–100 MPa over the conventional TMCP.

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© 2015 by The Iron and Steel Institute of Japan
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