The Influence of Continuous Cooling Rate on Nano-Precipitation Behavior of a Ti-Bearing Steel undergone Hot Deformation

被引:2
作者
Ji, Fengqin [2 ,3 ]
Li, Chengning [1 ]
Song, Wenwen [3 ]
Wang, Guodong [2 ]
机构
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China
[2] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Liaoning, Peoples R China
[3] Rhein Westfal TH Aachen, Dept Ferrous Met, D-52072 Aachen, Germany
基金
美国国家科学基金会;
关键词
austenite decomposition; continuous cooling rate; microstructure; precipitation behavior; Ti-bearing steel; NANOMETER-SIZED CARBIDES; LOW-CARBON STEEL; INTERPHASE PRECIPITATION; ALLOYED STEELS; HSLA STEEL; TRANSFORMATION; AUSTENITE; FERRITE;
D O I
10.1002/srin.201700361
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The formation of nanoscale precipitates influences the uniform mechanical properties of steels. The precipitation behavior in a Ti-bearing steel with 50% hot deformation is investigated at different continuous cooling rates, including 0.5, 2, and 5 degrees Cs-1. It is found that both the random precipitation and the interphase precipitation are observed in the hot deformed steel by means of transmission electron microscopy (TEM). At the cooling rate of 0.5 and 2 degrees Cs-1, the interphase precipitation and the random precipitation occur even in the same ferrite grain. When the cooling rate is 5 degrees Cs-1, the interphase precipitation disappears and only the random precipitates exist in the small ferrite grains. The morphologies of the interphase precipitation change from the irregular curved type (I-CIP) to regular curved type (R-CIP), and finally to the regular planar type (PIP) with the increase of the cooling rate. The interphase precipitation adjacent to the ferrite grain boundaries reveals its preferential occurrence in the final stage of the transformation. Compared with the isothermal heat treatment, the control of precipitation behavior via cooling rate adjustment is easier and less time-consuming to obtain tailored mechanical properties of the steel.
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页数:5
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