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本试验采用了EPR电化学方法及金相分析法,研究了不同含氮量的奥氏体不锈钢抗晶间腐蚀的性能;采用了缓慢应变速率试验方法,研究了其抗应力腐蚀性能,并通过扫描电子显微镜及透射电子显微镜,进行了断口形貌及位错结构分析,系统地了解了氮在304奥氏体不锈钢中具有阻滞敏化而提高抗应力腐蚀的性能及在高温水中缓蚀应力腐蚀的作用。试验证明,当含氮量为0.16％时,奥氏体不锈钢具有最佳的抗应力腐蚀、抗晶间腐蚀及强度、塑性等综合性能。
In this study, EPR electrochemical method and metallographic analysis were used to study the intergranular corrosion resistance of austenitic stainless steels with different nitrogen contents. The slow strain rate test method was used to study the stress corrosion resistance, Scanning electron microscopy and transmission electron microscopy, the fracture surface morphology and dislocation structure analysis, a systematic understanding of nitrogen in 304 austenitic stainless steel with a retardation sensitization to improve the resistance to stress corrosion and corrosion stress in high temperature water Corrosion effect. Experiments show that when the nitrogen content of 0.16%, austenitic stainless steel has the best anti-stress corrosion, anti-intergranular corrosion and strength, plastic and other comprehensive performance.