Effect of ferrite grain size on tensile deformation behavior of a ferrite-cementite low carbon steel
Effect of ferrite grain size on tensile deformation behavior of a ferrite-cementite low carbon steel
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DOI：
10.1016/j.msea.2007.11.047
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发表时间：
2008-08-15
期刊：
影响因子：
6.4
通讯作者：
Nagai, K.
中科院分区：
文献类型：
--
作者：
Tsuchida, N.;Masuda, H.;Nagai, K.
在296 K下，用应变速率为10（3）、10（0）和3.3 × 10（-4）s（-1）的拉伸试验，研究了铁素体晶粒尺寸在0.47 ~ 13.6 μ m之间的铁素体-铁素体（FC）钢的应力-应变曲线。FC钢的应力-应变曲线分为两种不同类型。在一种类型中，由于颈缩的发生，Luders变形被中断，而在另一种类型中，Luders带在拉伸试样的整个量规部分中传播，随后进行加工硬化。随着铁素体晶粒尺寸的减小，低屈服应力和流动应力增大，而均匀延伸率和总延伸率减小。铁素体晶粒尺寸对流变应力的影响几乎不受应变速率的影响。这些实验结果表明，晶粒细化强化主要贡献于非热应力分量的增加。(C)2007 Elsevier B. V.保留所有权利。
Stress-strain curves for ferrite-cementite (FC) steels with ferrite grain sizes between 0.47 and 13.6 mu m were studied by tensile tests with strain rates of 10(3), 10(0), and 3.3 x 10(-4) s(-1) at 296 K. The stress-strain curves for the FC steels are categorized into two different types. In one type, the Luders deformation is interrupted due to the onset of necking, and in the other type, the Luders band propagates throughout the gage section of a tensile specimen followed by work-hardening. The lower yield and flow stresses increase while uniform and total elongations decrease with a decrease in ferrite grain size. The effect of ferrite grain size on flow stress is hardly dependent on strain rate. These experimental results reveal that the grain refinement strengthening contributes mainly to an increase in the athermal stress component. (C) 2007 Elsevier B.V. All rights reserved.