Identification of new phases in annealed Fe-18CrWTi ODS powders

被引：23
作者：
Cayron, C. [1 ]
Montani, A. [1 ]
Venet, D. [1 ]
de Carlan, Y. [2 ]
机构：
[1] CEA, LITEN, DTH, F-38054 Grenoble, France
[2] CEA, DEN, SRMA, F-91191 Gif Sur Yvette, France
来源：
JOURNAL OF NUCLEAR MATERIALS | 2010年 / 399卷 / 2-3期
关键词：
OXIDE PARTICLES; FERRITIC STEEL; STABILITY; ALLOYS;
D O I：
10.1016/j.jnucmat.2010.01.023
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fe-18CrWTi ODS steels are developed by CEA for the SFR generation IV program. The powders of a Fe-18CrWTi alloy reinforced by Y(2)O(3) by mechanical milling have been annealed at 850 degrees C, 1100 degrees C and 1300 degrees C and their microstructure has been studied by SEM and TEM in order to better understand the precipitation mechanisms. The powders are constituted of large micrometric grains surrounded by nanometric ferritic grains. At 850 degrees C, no nano-oxide could be detected. At 1100 degrees C, some Y(2)Ti(2)O(7) precipitates of several hundreds of nanometres are detected at the grains boundaries, but again no nano-oxide could be observed. At 1300 degrees C, the precipitation has greatly changed. The sample contains hexagonal plate-shaped micrometric Y(2)TiO(5) precipitates. A high density of nano-oxides of size around 20-30 nm is also revealed by EFTEM and HRTEM. They are of different types such as Y(2)O(3), Y(2)Ti(2)O(7) and a new phase containing V. Ti and O that we called PyrOrtho (orthorhombic with a = 7.24 angstrom, b = 12.4 angstrom and c = 18.2 angstrom). This study shows that addition of Ti makes the precipitation sequence very complex. (C) 2010 Elsevier B.V. All rights reserved.
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页码：219 / 224
页数：6
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