期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 505, 期 1-2, 页码 169-177出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.11.019
关键词
9-12%Cr steels; Z-phase; Nucleation
类别
资金
- DOING Energy A/S
- Danish Research Agency [26-03-0275]
- SSF (Stiftelsen for Strategisk Forskning)
- VGB Research Foundation
Precipitation of large Z-phase particles. Cr(V,Nb)N, replacing fine MX nitrides, (V,Nb)N, has recently been identified as a major cause of premature breakdown in long-term creep strength of a number of new 9-12%Cr martensitic steels. The Z-phase precipitates slowly during long-term exposure at around 650 degrees C accelerated by high Cr content in the steels. It appears that the nucleation process controls the precipitation rate of Z-phase. A 12%Cr steel, which had precipitated Z-phase during long-term operation at 660 degrees C/12,000 h, was further heat treated in order to investigate the dissolution and reappearance processes for the Z-phase. In both cases it appears that Z-phase and MX phase are in physical contact and have a preferred crystallographic orientation relationship. The proposed nucleation mechanism is a chromium diffusion controlled transformation of MX into Z-phase, which explains the rather low precipitation rate of Z-phase. (C) 2008 Elsevier B.V. All rights reserved.
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