Micromechanical modeling of the behavior of duplex stainless steels

被引：33

作者：

Bugat, S ^{[1
]}

Besson, J ^{[1
]}

Pineau, A ^{[1
]}

机构：

[1] Ecole Mines Paris, Ctr Mat, Lab Met Mecan, CNRS,UMR 7633, F-91003 Evry, France

来源：

COMPUTATIONAL MATERIALS SCIENCE | 1999年 / 16卷 / 1-4期

关键词：

duplex stainless steels; micromechanical modeling; crystal plasticity; damage nucleation; scale transition;

D O I：

10.1016/S0927-0256(99)00058-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The aim of the present paper is the micromechanical modeling of an aged duplex (austenite/ferrite) stainless steel. While the elastic properties of both phases are almost the same, the plastic mismatch between ferrite and austenite is high due to ferrite aging. Accounting for the complex micro and macrostructure of this material, three scales are investigated. The first one corresponds to each single phase. The second scale consists of a percolated (interwoven) network of both phases. The third scale is an aggregate of percolated bicrystals. For the first scale, each phase is modeled as a single crystal. In the second scale, F.E. simulations are performed on a unit cubic cell representing the percolated networks. A mean held model is then fitted in order to represent that bicrystal. This mean field model is used at the third scale to model the behavior of the aggregate of two-phase grains, using a model for multi-phase materials. At this scale, it becomes possible to represent the distribution of average ferrite stresses in each ferrite-austenite bicrystal. These variations are thought to be responsible for the heterogeneous damage nucleation observed in this material. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：158 / 166

页数：9

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