Solute grain boundary segregation during high temperature plastic deformation in a Cr-Mo low alloy steel

被引：30
|
作者：
Chen, X. -M. [1 ]
Song, S. -H. [1 ]
Weng, L. -Q. [1 ]
Liu, S. -J. [1 ]
机构：
[1] Harbin Inst Technol, Dept Mat Sci & Engn, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 25-26期
基金：
中国国家自然科学基金;
关键词：
Grain boundaries; Segregation; Deformation; Metals and alloys; ANALYTICAL ELECTRON-MICROSCOPE; LOW-CARBON STEEL; HOT-DUCTILITY; DILUTE ALLOYS; DYNAMIC RECRYSTALLIZATION; SPATIAL-RESOLUTION; PHOSPHORUS; DIFFUSION; VACANCY; STRAIN;
D O I：
10.1016/j.msea.2011.06.084
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Grain boundary segregation of Cr, Mo and P to austenite grain boundaries in a P-doped 1Cr0.5Mo steel is examined using field emission gun scanning transmission electron microscopy for the specimens undeformed and deformed by 10% with a strain rate of 2 x 10(-3) s(-1) 900 degrees C, and subsequently water quenched to room temperature. Before deformation, there is some segregation for Mo and P. but the segregation is considerably increased after deformation. The segregation of Cr is very small and there is no apparent difference between the undeformed and deformed specimens. Since the thermal equilibrium segregation has been attained prior to deformation the segregation produced during deformation has a non-equilibrium characteristic. A theoretical model with consideration of site competition in grain boundary segregation between two solutes in a ternary alloy is developed to explain the experimental results. Model predictions are made, which show a reasonable agreement with the observations. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：7663 / 7668
页数：6
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