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本文采用悬臂弯曲预裂纹试样应力腐蚀试验方法和紧凑拉伸试样恒载荷法测定了５０Ｍｎ１８Ｃｒ４０ＷＮ奥氏体钢在含Ｃ１－和ＮＯ３－的水溶液中应力腐蚀以及电解充氢条件下氢致开裂的门槛值，并对应力腐蚀和氢致开裂的裂纹走向与断口形貌进行了观察．５０Ｍｎ１８Ｃｒ４ＷＮ钢在含Ｃ１－和ＮＯ３－的水溶液中均能产生应力腐蚀开裂，且在含ＮＯ３－的水溶液中比在含Ｃ１－的水溶液中应力腐蚀敏感性大．在电解充氢条件下，５０Ｍｎ１８Ｃｒ４ＷＮ钢也能产生氢致开裂．
In this paper, the stress corrosion of 50Mn18Cr40WN austenitic steel in aqueous solution containing C1- and NO3- and the hydrogen induced cracking under the condition of electrolysis and hydrogen charging were measured by using the stress corrosion test of pre-cracked cantilever specimen and the constant-load test of compact tensile specimen Threshold value, and the stress corrosion and hydrogen induced cracking cracks and fracture morphology were observed. 50Mn18Cr4WN steel can produce stress corrosion cracking in both C1- and NO3- -containing aqueous solutions and is more susceptible to stress corrosion in aqueous solutions containing NO3- than in aqueous solutions containing C1-. In the electrolysis of hydrogen charging conditions, 50Mn18Cr4WN steel can also produce hydrogen induced cracking.