Role of grain boundary characteristics in caustic IGA/SCC resistance of thermally-treated alloy 690 and shot-peened alloy 800

被引：0

作者：

Kawamura, H ^{[1
]}

Hirano, H ^{[1
]}

Shirai, S ^{[1
]}

Takamatsu, H ^{[1
]}

Matsunaga, T ^{[1
]}

Yamaoka, K ^{[1
]}

Oshinden, K ^{[1
]}

Takiguchi, H ^{[1
]}

机构：

[1] Cent Res Inst Elect Power Ind, Komae Res Lab, Komae, Tokyo 2018511, Japan

来源：

PROCEEDINGS OF THE NINTH INTERNATIONAL SYMPOSIUM ON ENVIRONMENTAL DEGRADATION OF MATERIALS IN NUCLEAR POWER SYSTEMS-WATER REACTORS | 1999年

关键词：

alloy; 600; 690; 800; steam generator tube; IGA/SCC; grain boundary;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Intergranular Attack and Stress Corrosion Cracking (IGA/SCC) initiation and crack growth behaviors of thermally-treated alloy 690 (690TT) and shot-peened alloy 800 (800SP) were examined in high temperature deaented NaOH+Na2CO3 solutions, using C-ring and Double Cantilever Beam (DCB) tests, and compared with those of alloy 600. In order to clarify the effect of the intergranular impurities segregation, chromium carbide precipitation and slip behaviors on caustic IGA/SCC initiation and propagation were also examined using Auger Electron Spectroscope (AES) and Transmission Electron Microscope equipped with Field Emission Gun(FEG-TEM). The results of C-ring tests showed that the ranking for caustic IGA/SCC resistance was alloy 600 < alloy 800SP < alloy 690TT. The results of DCB tests showed that the crack growth rate of alloy 800SP was the lowest. AES and FEG-TEM studies showed that boron and phosphorus were segregated at the grain boundary, and that chromium carbides were precipitated semicontinuously at the grain boundary of alloy 690TT, whereas they were not precipitated at the grain boundary of alloy 800SP. When the alloys were submitted to plastic deformation, slips of dislocation in alloy 690TT were canceled each other by intricate dislocations, whereas the slips of alloy 800SP were increased. Based on the above test results, it was judged that the chromium carbide precipitation behavior and the slipping behavior of dislocations could be a contributing factor to caustic IGA/SCC of alloy 690TT and 800SP.

引用

页码：601 / 608

页数：8

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