Microstructural evolution and formation mechanism of bimodal structure of 0.2% carbon steel subjected to the heavy-reduction controlled rolling process

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:624

Article

Park, Hyung-Won¹  Shimojima, Kei¹  Sugiyama, Sumio²  Komine, Hisanao²  Yanagimoto, Jun² 

[1] Univ Tokyo, Grad Sch Engn, Meguro Ku, Tokyo 1538505, Japan

[2] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan

关键词: Low-carbon steel;    Bimodal structure;    Severe plastic deformation;    Controlled-rolling process;    Thermomechanical processing;    Plane-strain compression;   

DOI  :  10.1016/j.msea.2014.11.070

来源: Elsevier

【 摘 要 】

A heavy-reduction controlled rolling process with approximately 75% thickness reduction was carried out to investigate the microstructural evolution including texture development, focusing on the formation of a bimodal structure of 0.2% carbon steel with heating temperatures of 700, 800, 900, and 1000 degrees C. Upon increasing the heating temperature from 700 to 900 degrees C, the microstructure was refined and precipitates such as Fe3C were uniformly distributed throughout the microstructure. For the microstructures control-rolled at heating temperatures of 900 and 1000 degrees C with average ferrite grain sizes of 1.34 and 1.63 mu m, respectively, a bimodal structure could be observed by scanning electron microscopy (SEM), which was very similar to the result of a plane-strain compression (PSC) test. Moreover, the 900 and 1000 degrees C-heated specimens had less well developed textures primarily consisting of {113}-{4 4 11}< 110 > and {332}< 113 > components, which usually developed by the transformation (gamma ->alpha), and the 1000 degrees C-heated specimen exhibited various textures and a low intensity of the {100}(011) component, which was generally transformed from the {100}< 001 > component of the recrystallized austenite. (C) 2014 Elsevier B.V. All rights reserved.

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