Ferrite Transformation During Deformation of Undercooled Austenite in Low Carbon Steels with Different Mn Contents

Acta Metall Sin

2004, Vol. 40

Issue (1): 1-7 DOI:

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Ferrite Transformation During Deformation of Undercooled Austenite in Low Carbon Steels with Different Mn Contents

zhou Rongfeng;YANG Wangyue; SUN Zuqing

School of Materials Science and Engineering;University of Science and Technology Beijing

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zhou Rongfeng; YANG Wangyue; SUN Zuqing. Ferrite Transformation During Deformation of Undercooled Austenite in Low Carbon Steels with Different Mn Contents. Acta Metall Sin, 2004, 40(1): 1-7 .

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Abstract The microstructure evolution during deformation of undercooled austenite in three low carbon steels with much close contents of Si and C but different contents of Mn has been investigated by means of hot compression simulation experiment at 760℃ and strain rate of 1 s-1. The effects of the content of Mn on the deformed behavior of undercooled austentie, the kinetics characteristics of deformation enhanced ferrite transformation and the ferrite grain size have been studied. It was found that the addition of Mn delays the transformation during deformation of undercooled austenite and higher true strain for the transformation is needed with increasing Mn content. Transformation kinetics can be divided into three stages, longer time and higher true strain are needed for each stages with increasing Mn content in the steels. Deformation enhanced transformation induces forming ultra--fine equiaxed ferrite grains with sizes of 3.57±1.60, 2.00±1.05 and 2.29±1.02 um in steels with 0.48, 0.84 and 1.29 Mn respectively, and homogeneously distributed minor second phases.

Key words: low carbon steel deformation enhanced transformation grainrefinement

Received: 28 January 2003

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I1/1

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