Influence of martensite volume fraction and cooling rate on the properties of thermomechanically processed dual phase steel

被引：70
作者：
Asadi, Mehdi [1 ]
De Cooman, Bruno Charles [2 ]
Palkowski, Heinz [3 ]
机构：
[1] Benteler Automot, D-33102 Paderborn, Germany
[2] Pohang Univ Sci & Technol POSTECH, Grad Inst Ferrous Technol GIFT, Pohang, Kyungbuk, South Korea
[3] Clausthal Univ Technol, Inst Met Met Forming & Proc IMET, Clausthal Zellerfeld, Germany
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 538卷
关键词：
Dual phase steel; Martensite volume fraction; Cooling rate; Bake hardening; Thermomechanical controlled processing; TRANSFORMATION-INDUCED PLASTICITY; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; HARDENING BEHAVIOR; MULTIPHASE STEELS; TENSILE-STRENGTH; LOCAL PROPERTIES; STRAIN; MICROSTRUCTURE; MORPHOLOGY;
D O I：
10.1016/j.msea.2012.01.010
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Thermomechanical controlled processing (TMCP) simulations were preformed using a flat compression test, in order to develop a comprehensive understanding of the effect of the martensite volume fraction (MVF) and the cooling rate on the phase transformation behavior, microstructural evolution, mechanical properties and bake hardening (BH) ability of thermomechanically processed dual phase (DP) steel. The cooling schedule affected the microstructural constituents (polygonal ferrite and martensite) and phase transformation behavior of the DP steel. The relationship between the volume fraction of the martensite, the morphology and distribution of phases present in the microstructure, and the mechanical properties of DP steel was studied in detail. A higher MVF and an increasing cooling rate after the last deformation to the fast cooling start temperature (T-FC) raised both the strength and the bake hardenability of the DP steel. Moreover, a correlation between MVF and bake hardening effect was found. A larger MVF led to an increase of BH levels. (C) 2012 Elsevier B.V. All rights reserved.
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页码：42 / 52
页数：11
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