DISPERSION HARDENING EFFECTS OF NB-V PRECIPITATES IN MOD.9CR-1MO STEELS

被引：15
|
作者：
HAMADA, K
TOKUNO, K
TAKEDA, T
机构：
[1] Steel Research Laboratories, Nippon Steel Corporation, Futtsu, Chiba, 20-1, Shintomi
来源：
NUCLEAR ENGINEERING AND DESIGN | 1993年 / 139卷 / 03期
关键词：
D O I：
10.1016/0029-5493(93)90169-A
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
The mechanism of high creep strength of high nitrogen Mod.9Cr-1Mo steels was metallurgically investigated by using an analytical high resolution TEM. The threshold stress in the constituent equation, epsilon = A(sigma(a)-sigma(th))n exp(Q/RT), is strongly dependent on dispersion strengthening due to peculiar-shaped niobium-and-vanadium-precipitates, i.e. wing-like vanadium-nitrides ''V-wings'' adhering to spherical niobium-carbonitrides. Key factors of the strength are size and shape of the precipitates. Increase of nitrogen addition is effective to growth of V-wings leading to large threshold stress. Calculated stresses based on a dispersion strengthening showed a good fit with experimentally-measured stresses.
引用
收藏
页码：277 / 281
页数：5
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