Effect of silicon and prior deformation of austenite on isothermal transformation in low carbon steels
来源期刊：Acta Metallurgica Sinica2009年第2期
论文作者：Minghui CAI Jiansu ZHANG Hun DING Long LI
Key words：Low carbon steel; Si content; Prior deformation of austenite; Ferrite transformation; Bainite transformation;
Abstract: Isothermal transformation (TTT) behavior of the low carbon steels with two Si con-tents (0.50 wt pct and 1.35 wt pct) was investigated with and without the prior deformation. The results show that Si and the prior deformation of the austenite have significant effects on the transformation of the ferrite and bainite. The addition of Si refines the ferrite grains, accelerates the polygonal ferrite transformation and the formation of M/A constituents, leading to the improvement of the strength. The ferrite grains formed under the prior deformation of the austenite become more ho-mogeneous and refined. However, the influence of deformation on the tensile strength of both steels is dependent on the isothermal temperatures. Thermodynamic calcu-lation indicates that Si and prior deformation reduce the incubation time of both ferrite and bainite transformation, but the effect is weakened by the decrease of the isothermal temperatures.
Minghui CAI1，Jiansu ZHANG2，Hun DING1，Long LI3
(1.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China;
2.Technology Center,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China;
3.National Institute for Materials Science,Tsukuba 305-0047,Japan)
Abstract:Isothermal transformation (TTT) behavior of the low carbon steels with two Si con-tents (0.50 wt pct and 1.35 wt pct) was investigated with and without the prior deformation. The results show that Si and the prior deformation of the austenite have significant effects on the transformation of the ferrite and bainite. The addition of Si refines the ferrite grains, accelerates the polygonal ferrite transformation and the formation of M/A constituents, leading to the improvement of the strength. The ferrite grains formed under the prior deformation of the austenite become more ho-mogeneous and refined. However, the influence of deformation on the tensile strength of both steels is dependent on the isothermal temperatures. Thermodynamic calcu-lation indicates that Si and prior deformation reduce the incubation time of both ferrite and bainite transformation, but the effect is weakened by the decrease of the isothermal temperatures.
Key words:Low carbon steel; Si content; Prior deformation of austenite; Ferrite transformation; Bainite transformation;
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