Effect of carbon on strain-rate and temperature sensitivity of twinning-induced plasticity steels: Modeling and experiments

被引：29
|
作者：
Li, Y. Z. [1 ,2 ]
Luo, Z. C. [1 ,2 ]
Liang, Z. Y. [1 ,2 ]
Huang, M. X. [1 ,2 ]
机构：
[1] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China
[2] Univ Hong Kong, Shenzhen Inst Res & Innovat, Shenzhen, Peoples R China
来源：
ACTA MATERIALIA | 2019年 / 165卷
基金：
中国国家自然科学基金;
关键词：
TWIP steels; Dislocation mobility; Thermally activated processes; Carbon; Strain-rate sensitivity; INTERNAL-FRICTION PEAK; FLOW-STRESS; MECHANICAL-PROPERTIES; DISLOCATION DYNAMICS; TENSILE PROPERTIES; ACTIVATION VOLUME; CONTINUUM THEORY; TWIP STEEL; DEFORMATION; DEPENDENCE;
D O I：
10.1016/j.actamat.2018.11.048
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The temperature- and rate-dependent yielding of twinning-induced plasticity (TWIP) steels containing various carbon contents are investigated in the present work. The activation volume and the activation energy have been determined. The magnitude of these thermal activation parameters for high-carbon TWIP steels are largely different from those of conventional fcc metals, implying the fundamental role of carbon on the thermally activated dislocation activities in carbon-added TWIP steels. A constitutive model, which rationalizes yielding as the thermally assisted bowing out of dislocations under the pinning effect of carbon solutes, is proposed, and for the first time quantitatively predicts the thermal activation parameters of TWIP steels as a function of carbon content. Based on the modeling results of thermal activation parameters, the overall temperature- and rate-dependent yield stresses of TWIP steels containing various carbon contents are predicted, showing good agreements with experimental results. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：278 / 293
页数：16
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