Factors influencing the tensile behavior of a Fe-28Mn-9Al-0.8C steel

被引:104
作者
Yoo, Je Doo [1 ]
Hwang, Si Woo [2 ]
Park, Kyung-Tae [1 ]
机构
[1] Hanbat Natl Univ, Div Adv Mater Sci & Eng, Taejon 305719, South Korea
[2] Yonsei Univ, Steel Res Inst, Seoul 120749, South Korea
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 508卷 / 1-2期
关键词
Austenite; Tensile properties; Grain size; Solution treatment; Strain rate; Serrated flow; STACKING-FAULT ENERGY; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; C ALLOYS; MN; PLASTICITY; DEPENDENCE; IRON;
D O I
10.1016/j.msea.2008.12.055
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
High Mn-Al-C steels were recently reappraised as the promising material for advanced auto body system by their excellent combination of strength and ductility over 60,000 MPa% associated with microband-induced plasticity. This study was intended to examine the factors affecting the tensile properties of high Mn-Al-C steels. For this purpose, tensile tests and microstructural analyses were performed on a Fe-28W-9AI-03C steel at various conditions. As usual, strength increased and elongation decreased with decreasing the grain size. The strain hardening rate of the fine-grained steel remained unchanged to the medium strain level but that of the coarse-grained steel continuously increased to the high strain level, resulting in exceptional ductility. Fully austenitic steel obtained by high temperature solution treatment exhibited the continuous increase of strain hardening rate while that of the steel solution-treated at low temperature decreased with increasing strain due to the bimodal grain size distribution and the presence of submicron ferrite. In the strain rates of 2 x 10(-4) s(-1) to 10(-1) s(-1), strength was relatively insensitive to the strain rate but elongation decreased with increasing the strain rate, indicating that plastic deformation was mainly achieved by thermal activation in this strain rate range. In the temperature range of 25-450 degrees C, both strength and elongation decreased with increasing temperature except at 300 degrees C where serrated flow occurred with extended ductility. The flow characteristics at 300 degrees C were rationalized in terms of dynamic strain aging associated with carbon exhaustion. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:234 / 240
页数:7
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