Basic investigation for life assessment technology of modified 9Cr-1Mo steel

被引：53

作者：

Okamura, H

Ohtani, R

Saito, K

Kimura, K

Ishii, R

Fujiyama, K

Hongo, S

Iseki, T

Uchida, H

机构：

[1] Toshiba Co Ltd, Power & Ind Syst R&D Ctr, Tsurumi Ku, Yokohama, Kanagawa 2300045, Japan

[2] Sci Univ Tokyo, Noda, Chiba 2780022, Japan

[3] Kyoto Univ, Sakyo Ku, Kyoto 6068317, Japan

[4] Japan Power Engn & Inspect Corp, Minato Ku, Tokyo 1070052, Japan

来源：

NUCLEAR ENGINEERING AND DESIGN | 1999年 / 193卷 / 03期

关键词：

Aging of materials - Chromium alloys - Creep testing - Crystal microstructure - Fatigue testing - Hardness - Heat affected zone - Metallographic microstructure - Microcracking - Stainless steel - Toughness - Welds;

D O I：

10.1016/S0029-5493(99)00181-8

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：

In order to develop life assessment techniques for aged components made of modified 9Cr-1Mo steel, specimens were artificially deteriorated by aging, creep and fatigue tests at elevated temperatures, and associated changes in the microstructure and mechanical properties were examined. It was observed that aging resulted in formation of Laves phase causing a decrease in toughness. The creep damage in base metal could be correlated with decrease in hardness, while creep damage in weldments could be correlated with the area fraction and density of creep voids. Creep rupture in weldments occurred in the fine-grained heat affected zone by the formation and growth of creep voids. The fatigue damage in base metal correlated to the maximum length of a crack among micro-cracks initiated during fatigue cycles. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：243 / 254

页数：12