Cyclic softening of martensitic steels at high temperature - Experiments and physically based modelling

被引：73

作者：

Sauzay, Maxime ^{[1
]}

Fournier, Benjamin ^{[1
,2
]}

Mottot, Michel ^{[1
]}

Pineau, Andre ^{[2
]}

Monnet, Isabelle ^{[3
]}

机构：

[1] CEA, SRMA, F-91191 Gif Sur Yvette, France

[2] ENSMP Ctr Mat, F-91003 Evry, France

[3] GANIL, F-14076 Caen, France

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 483-84卷 / 1-2 C期

关键词：

creep-fatigue; martensitic steel; cyclic softening; microstructure evolution; low-angle boundary; climb;

D O I：

10.1016/j.msea.2006.12.183

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Martensitic steels subjected to cycling at high temperature usually show softening accompanied by microstructural changes such as the disappearance of low-angle boundaries (LABs). A micromechanical model of the disappearance of LABs due to annihilation between mobile impinging dislocations and LAB dislocations has been recently proposed [M. Sauzay, H. Brillet, I. Monnet, M. Mottot, F. Barcelo, B. Fournier, A. Pineau, Mater. Sci. Eng. A 400-401 (2005) 241-244]. This model is, however, unable to accurately reproduce viscoplastic strain amplitude and hold time effects, while these effects are clearly observed. Considering that there is not a complete renewal of the (edge) mobile dislocations at each cycle, the lifetime of the mobile dislocations is introduced as well as a climb mechanism to describe more accurately the annihilation mechanisms. Using in addition the Hall-Petch modelling proposed by Li, stress softening predictions are discussed with respect to experimental results. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：410 / 414

页数：5

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