在模拟压水堆正常工况环境中对正常组织和夹杂物超标的 Z2CN19-10不锈钢 U 型弯曲试样进行恒应力浸泡试验，并分别在250 mV 外加电位下、在富含溶解氧和氯离子溶液中以及在沸腾 MgCl2溶液中进行加速应力腐蚀试验，研究了夹杂物对该钢应力腐蚀开裂的影响。结果表明：在模拟压水堆正常工况环境以及250 mV 外加电位、富含溶解氧和氯离子的溶液中，超标的夹杂物均不会导致试验钢出现应力腐蚀开裂；在沸腾 MgCl2溶液中，两种试样均发生了应力腐蚀开裂，但在裂纹萌生区和扩展区未发现夹杂物，说明应力腐蚀开裂与夹杂物无明显关系。
Immersion test at constant stress was carried out on U-shaped bending stainless steel specimen with normal microstructure and excessive inclusions in the normal environment of simulated pressurized-water reactor(PWR),as well as accelerated stress corrosion tests at 250 mV applied potential,in the solution rich in dissolved oxygen and chlorine ion,and in boiling MgCl2 solution.The effect of inclusions on the stress corrosion cracking of the steel was studied.The results show that,in the environment of simulated PWR,and in the 250 mV applied potential and the solution rich in dissolved oxygen and chlorine ion,excessive inclusions did not result in stress corrosion cracking.In boiling MgCl2 solution,stress corrosion cracking was found in the two kinds of specimens,but no inclusions were found in the crack initiation and propagation regions,there was no evident relationship between inclusions and stress corrosion cracking.
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