Work hardening behavior of ultrafine-grained Mn transformation-induced plasticity steel

被引：87
作者：
Lee, Seawoong [1 ]
Lee, Seok-Jae [1 ]
De Cooman, Bruno C. [1 ]
机构：
[1] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Pohang 790784, South Korea
来源：
ACTA MATERIALIA | 2011年 / 59卷 / 20期
基金：
新加坡国家研究基金会;
关键词：
Ultra-fine grain size; Localized deformation; Grain boundary thickening; STRAIN-RATE SENSITIVITY; LOW-CARBON STEEL; ACTIVATION VOLUME; TEMPERATURE; METALS; DEFORMATION; IRON; NANOCRYSTALLINE; AUSTENITE; STABILITY;
D O I：
10.1016/j.actamat.2011.08.030
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ultrafine grain refinement by intercritical annealing at 680 degrees C and 640 degrees C was investigated in a Fe-0.05%C-6.15%Mn-1.4%Si multiphase TRIP steel. A large volume fraction of retained austenite was obtained at room temperature in both cases. Whereas a pronounced localization of the deformation during tensile testing appeared in the steel annealed at 640 degrees C, strain localization occurred only in the initial deformation stages in the steel annealed at 680 degrees C. The retained austenite was transformed to strain-induced martensite during tensile testing in the sample annealed at 680 degrees C. However, no martensitic transformation was observed in the sample annealed at 640 degrees C. The activation volume showed a sharp decrease during the tensile test and saturated to the same value in both cases. Two different dislocation structures were observed in the ferrite grains of the samples annealed intercritically at 680 degrees C after tensile deformation, but only the dislocation-free structure of ferrite was observed in the sample annealed at 640 degrees C. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：7546 / 7553
页数：8
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