抄録
The influence of pre-aging on creep rupture strength has been investigated to understand the creep damage mechanism of tungsten alloyed 9%Cr ferritic steel KASTBA29/KA-STPA29. Additionally, we have also examined changes in strengthening factors during creep and thermal aging by a nano-identation test. Experimental results revealed that the creep rupture strength of thermally aged materials decreased with prolonged pre-aging and that the decrease in solid-solution strengthening due to Laves phase precipitation was mainly responsible for this reduction of creep rupture strength. Based on the results, an electrochemical nondestructive procedure, which quantitatively detected the amount of Laves phase, has been proposed to evaluate creep damage accumulation in the steel. By using this electrochemical method and a newly proposed parameter based on the kinetics of Laves phase precipitation, a testing temperature or applied stress of creep-damaged materials can be nondestructively estimated with relatively high accuracy.
| 本文言語 | English |
|---|---|
| ページ（範囲） | 30-38 |
| ページ数 | 9 |
| ジャーナル | JSME International Journal, Series A: Solid Mechanics and Material Engineering |
| 巻 | 45 |
| 号 | 1 |
| DOI | |
| 出版ステータス | Published - 2002 1月 |
ASJC Scopus subject areas
- 材料科学（全般）
- 機械工学