用交流电位降(ACPD)技术实现了模拟压水堆一回路340℃高温水环境中690合金应力腐蚀裂纹扩展的实时监测. 断口观察表明, 2种一维冷加工690合金均出现沿晶应力腐蚀裂纹扩展, 裂纹沿平行轧制方向的扩展速率略高于垂直轧制方向的速率; 当溶解H浓度(CdH)由30 μL/g减小到10 μL/g时, 经1075℃退火和700℃固溶处理15 h并一维冷轧25%的T-L取向690合金的平均裂纹扩展速率由4.8×10-11 m/s增加至11.2×10-11 m/s; 应力腐蚀裂纹扩展主要为内氧化机制.
Stress corrosion crack growth rates of alloy 690 thermally treated (TT) after one–directionally (1D) cold–rolling along the longitudinal (L) direction and three–directionally (3D) cold–rolling were successfully measured by ACPD technique in deoxygenated water with different dissolved hydrogen contents (CdH) at 340 ℃. The fracture mode is mainly intergranular mode in both two kinds of alloy 690TT. The crack growth rates in the T–L orientation are higher than those in the L–T orientation in 340 ℃deoxygenated environments. For 1D 25% alloy 690TT with T–L orientation, the measured average crack growth rate is 4.8×10−11 m/s in 340℃ water with CdH 30 μL/g, and the measured average crack growth rate is 1.1×10−10 m/s in 340 ℃ water with CdH 10 μL/g. The mechanism of crack growth is internal oxidation mechanism.
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