Niobium Carbo-Nitride Precipitation Behavior in a High Nitrogen 15Cr-15Ni Heat Resistant Austenitic Stainless Steel

被引：7
|
作者：
Vu The Ha [1 ,2 ]
Jung, Woo Sang
机构：
[1] Univ Sci & Technol, Nanomat Sci & Engn Fac, Taejon, South Korea
[2] Korea Inst Sci & Technol, Mat Res Div, Seoul 130650, South Korea
来源：
METALS AND MATERIALS INTERNATIONAL | 2011年 / 17卷 / 05期
关键词：
niobium carbo-nitride; precipitation; 15Cr-15Ni; creep; aging; CREEP CAVITATION;
D O I：
10.1007/s12540-011-1003-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A high nitrogen 15Cr-15Ni niobium-stabilized austenitic alloy has been produced and subjected to a special heat treatment consisting of 5 hours of solution treatment at 1270 degrees C followed by hot rolling, quenching and subsequent aging at temperatures of 700 degrees C to 800 degrees C. It was found that fine dispersion of nano-sized thermally stable primary Nb(C,N) precipitates had already formed in the as-cast condition. The particles were presented at all examined stages of the TMT process (as-homogenized, as-solution treated and as-aged conditions). Secondary precipitates Nb(C,N) were densely formed during subsequent aging; these precipitates had sizes of 4 nm to 5 nm. Both the primary and secondary Nb(C,N) particles showed excellent thermal stability within the temperature range of 700 degrees C to 800 degrees C. The creep properties of the studied alloy at 750 degrees C were superior when compared to those of commercial type 347 stainless steel.
引用
收藏
页码：713 / 720
页数：8
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