Microstructural evolution during bainite transformation in a vanadium microalloyed TRIP-assisted steel

被引：29

作者：

Abbasi, E. ^{[1
]}

Rainforth, W. M. ^{[1
]}

机构：

[1] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 651卷

基金：

英国工程与自然科学研究理事会;

关键词：

Microalloyed TRIP-assisted steel; Intercritical annealing; Bainite transformation; Microstructural evolution; V(C; N); precipitation; TRANSMISSION ELECTRON-MICROSCOPY; IN-SITU OBSERVATIONS; MECHANICAL-PROPERTIES; INDUCED PLASTICITY; PHASE-TRANSFORMATION; LATTICE-PARAMETER; PRECIPITATION; AUSTENITE; BEHAVIOR; DEFORMATION;

D O I：

10.1016/j.msea.2015.11.024

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The microstructural evolution and subsequent properties of a cold rolled 0.12 wt% V microalloyed transformation induced plasticity assisted steel were studied after intercritical annealing, focusing on isothermal bainite transformation at 460 degrees C. The heat treated steel was examined by optical microscopy, scanning-transmission electron microscopy and microanalysis, X-ray diffraction analysis and tensile testing. The tensile testing showed considerable improvements in yield strength and total elongation with longer isothermal bainite holding times (i.e. 180 s). According to microscopy observations, these effects were attributed to the increase in the population of film-type retained austenite and newly formed dislocations as a result of bainite transformation. No significant V(C,N) precipitation and growth-coarsening were observed during isothermal bainite transformation, which is consistent with conventional vanadium microalloyed steels. However, the V(C,N) precipitates in dislocation tangles suggested the possible contribution of precipitates on the tensile properties of steel. (c) 2015 Elsevier B.V. All rights reserved.

引用

页码：822 / 830

页数：9

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