Experimental and numerical study on geometrically necessary dislocations and non-homogeneous mechanical properties of the ferrite phase in dual phase steels

被引：345

作者：

Kadkhodapour, J. ^{[1
,2
]}

Schmauder, S. ^{[2
]}

Raabe, D. ^{[3
]}

Ziaei-Rad, S. ^{[1
]}

Weber, U. ^{[2
]}

Calcagnotto, M. ^{[3
]}

机构：

[1] Isfahan Univ Technol, Dept Mech Engn, Esfahan 8415683111, Iran

[2] Univ Stuttgart, Inst Mat Testing Mat Sci & Strength Mat, Stuttgart, Germany

[3] Max Planck Inst Eisenforsch GmbH, D-4000 Dusseldorf, Germany

来源：

ACTA MATERIALIA | 2011年 / 59卷 / 11期

关键词：

Dual phase steels; Nano hardness test; Geometrically necessary dislocations; Local hardening; Micromechanical model; STRAIN-HARDENING BEHAVIOR; LOW-CARBON STEEL; TENSILE PROPERTIES; DEFORMATION-BEHAVIOR; STRENGTH; MARTENSITE; MORPHOLOGY; DUCTILITY; FINE;

D O I：

10.1016/j.actamat.2011.03.062

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure of dual phase steels can be compared with a composite composed of a matrix of ferrite reinforced by small islands of martensite. This assumption has been used in several attempts to model the mechanical properties of dual phase steels. However, recent measurements show that the properties of the ferrite phase change with distance from the martensite grains. These measurements showed that the grains of the ferrite phase are harder in the vicinity of martensite grains. As a consequence of this local hardening effect, the ferrite phase has to be considered as an inhomogeneous matrix in modeling dual phase steels. This experiment inspired the idea that local hardening is caused by geometrically necessary dislocations. The idea is investigated experimentally and numerically in the present analysis, which for the first time leads to good agreement with experimental observations of the mechanical stress-strain behavior. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4387 / 4394

页数：8

共 36 条

[31] Formability of high strength dual-phase steels [J].