Atomic resolution imaging of precipitate transformation from cubic TaN to tetragonal CrTaN

被引：27

作者：

Danielsen, Hilmar K. ^{[1
]}

Hald, John ^{[1
,2
]}

Somers, Marcel A. J. ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Mech Engn, Produktionstorvet Bldg 425, DK-2800 Lyngby, Denmark

[2] DONG Energy, DK-2820 Gentofte, Denmark

来源：

SCRIPTA MATERIALIA | 2012年 / 66卷 / 05期

关键词：

Phase transformations; High-resolution electron microscopy (HREM); Heat-resistant steels; Nitrides; Crystal structure; Z-PHASE; CRYSTAL-STRUCTURE; MG ALLOYS; FE; NITRIDES; BEHAVIOR;

D O I：

10.1016/j.scriptamat.2011.11.005

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In 9-12% Cr creep-resistant steels Cr(V,Nb,Ta)N Z-phase is known to replace metastable (V,Nb,Ta)N MN precipitates at high temperatures. The precipitation process of Z-phase does not follow the classical nucleation theory, where dissolving MN particles provide constituents for Z-phase nucleation in the matrix. Using atomic resolution transmission electron microscopy, the current work demonstrates that metastable cubic TaN precipitates in a complex steel gradually transform compositionally and crystallographically into stable tetragonal CrTaN precipitates under the influence of Cr indiffusion from the steel matrix. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：261 / 264

页数：4

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