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在高温水环境中采用线性伏安法和慢拉伸试验法,分别研究了温度对国产P92钢点蚀形核及应力腐蚀开裂的影响规律。线性伏安法结果表明:随着温度的提高,P92钢在水中的耐腐蚀性能逐渐降低,晶界处点蚀形核数增多;慢拉伸试验结果表明,P92钢在试验条件下具有应力腐蚀开裂敏感性和动态应变时效(DSA)倾向,且随温度升高增强。通过扫描电镜(SEM)对试样断口截面及侧面形貌进行分析,结果表明随着温度的升高,断口侧面应力腐蚀裂纹以沿晶形式向内扩展,断口边缘呈明显脆性断裂特征。
Linear voltammetry and slow tensile test were used to study the effect of temperature on pitting nucleation and stress corrosion cracking of domestic P92 steel in high temperature water environment. The results of linear voltammetry showed that with the increase of temperature, the corrosion resistance of P92 steel in water gradually decreased, and the number of pitting nucleation at grain boundaries increased. The results of slow tensile test showed that P92 steel had stress corrosion under the experimental conditions Cracking susceptibility and dynamic strain aging (DSA) tendency, and with increasing temperature. The fracture surface and side morphology of the specimen were analyzed by scanning electron microscope (SEM). The results show that with the increase of temperature, the stress corrosion cracking on the side of fracture increases inwardly along the grain boundary, and the edge of the fracture shows a brittle fracture.