核电汽轮机用钢蓝脆和应力腐蚀的交互作用

INTERACTION BETWEEN BLUE BRITTLENESS AND STRESS CORR0SION CRACKING

本文研究了核电汽轮机用钢蓝脆和应力腐蚀的交互作用，结果表明：这类中强度钢在水介质中的应力腐蚀敏感性很小，只能用慢拉伸方法才能发现．但是，在蓝脆温度（230℃）附近，动态应变时效将和应力腐蚀发生交互作用，从而使应力腐蚀敏感性急剧升高．其原因和应变高度局部化导致的氢富集有关.

30Cr2Ni4MoV and 30Cr2MoV steels presented blue brittleness near 230℃ and 180℃, respectively. The susceptibility of stress corrosion cracking (SCC) for this kind of steels in aqueous solution at various temperatures is very low except near blue brittleness temperature. Near blue brittless temperature, there is a strong interaction between the dynam-ic strain aging, which results in blue brittleness, and SCC, resulting in a steep enhancement of the susceptibility of SCC.