EFFECT OF THERMOMECHANICAL TREATMENT ON TOUGHNESS OF 9CR-W FERRITIC-MARTENSITIC STEELS DURING AGING

被引：19
|
作者：
KUNIMITSU, S
YOU, Y
KASUYA, N
SASAKI, Y
HOSOI, Y
机构：
[1] Department of Materials Science and Engineering, Nagoya University, Chikcusa-ku, Nagoya, 464, Furo-cho
来源：
JOURNAL OF NUCLEAR MATERIALS | 1991年 / 179卷
关键词：
D O I：
10.1016/0022-3115(91)90182-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The precipitation behavior and toughness during aging of thermo-mechanically-treated (TMT) 9Cr-2W, 9Cr-4W and 9Cr-2No ferritic-martensitic steels were investigated. All three steels showed an increase on toughness after TMT in the as tempered condition. This was the result of a fine-grained microstructure introduced by TMT. However, in 9Cr-2Mo and 9Cr-4W steels, precipitation of M23C6, M6C and the Laves phase (Fe2W or Fe2Mo) was accelerated due to TMT and the beneficial effect of fine-grained microstructure on toughness was lost by aging at 875 K for 360 ks. In the case of 9Cr-2W steel, the accelerated precipitation was slight and good structural stability and toughness were maintained after 360 ks aging. A decrease in toughness, however, was observed after 360 ks aging, when the Laves phase was finally found to precipitate.
引用
收藏
页码：689 / 692
页数：4
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