Monte Carlo and molecular dynamics simulations of screw dislocation locking by Cottrell atmospheres in low carbon Fe-C alloys

被引：57

作者：

Veiga, R. G. A. ^{[1
]}

Goldenstein, H. ^{[1
]}

Perez, M. ^{[2
]}

Becquart, C. S. ^{[3
]}

机构：

[1] Univ Sao Paulo, Escola Politecn, Dept Engn Met & Mat, BR-05508030 Sao Paulo, SP, Brazil

[2] Univ Lyon, UMR CNRS 5510, INSA Lyon, MATEIS, F-69621 Villeurbanne, France

[3] Ecole Natl Super Chim Lille, Unite Mat & Transformat UMET, UMR CNRS 8207, F-59655 Villeneuve Dascq, France

来源：

SCRIPTA MATERIALIA | 2015年 / 108卷

基金：

巴西圣保罗研究基金会;

关键词：

Cottrell atmosphere; Screw dislocation; Strain ageing; Monte Carlo; Molecular dynamics; EDGE DISLOCATION; TEMPERATURE; SYSTEM;

D O I：

10.1016/j.scriptamat.2015.06.012

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

On-lattice Monte Carlo shows strong carbon segregation at a screw dislocation in bcc iron for carbon contents that vary from 20 to 500 ppm, typical in ultra low and low carbon steels. Molecular dynamics simulations are then carried out using the atomic coordinates of equilibrated Cottrell atmospheres. The stresses required to make the screw dislocation break free of the carbon cloud are very high compared to carbon in solid solution; the locking time is also much longer. All simulations are performed at 300 K. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：19 / 22

页数：4