期刊
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
卷 9, 期 1, 页码 -出版社
TAYLOR & FRANCIS LTD
DOI: 10.1088/1468-6996/9/1/013002
关键词
Ostwald ripening; M23C6 carbide; MX carbonitride; martensite; 9% Cr steel; creep strength; sub-boundary hardening
It is crucial for the carbon concentration of 9% Cr steel to be reduced to a very low level, so as to promote the formation of MX nitrides rich in vanadium as very fine and thermally stable particles to enable prolonged periods of exposure at elevated temperatures and also to eliminate Cr-rich carbides M23C6. Sub-boundary hardening, which is inversely proportional to the width of laths and blocks, is shown to be the most important strengthening mechanism for creep and is enhanced by the fine dispersion of precipitates along boundaries. The suppression of particle coarsening during creep and the maintenance of a homogeneous distribution of M23C6 carbides near prior austenite grain boundaries, which precipitate during tempering and are less fine, are effective for preventing the long-term degradation of creep strength and for improving long-term creep strength. This can be achieved by the addition of boron. The steels considered in this paper exhibit higher creep strength at 650 degrees C than existing high-strength steels used for thick section boiler components.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据