【摘要】 <正> 一、前言用于制造汽轮发电机护环的50Mn18Cr4WN奥氏体钢（简称18/4钢）在服役过程中于低应力作用下常发生延迟断裂,其特征为沿晶开裂。许多人将其归结为应力腐蚀,认为有三种可能的腐蚀介质,即硝酸根,氯离子和氢气。近两年我们研究了18/4钢在含NO₃^-和Cl^-的水溶液在的应力腐蚀以及在动态电解充氢条件下氢致开裂的特性。以100小时为截取时间,在更多还原

【Abstract】 The relationship between the cracking time of SCC and applied polarization current density for the retaining ring steel 50Mn18Cr4WN in a nitrate aqueous solution was determinde. The variation of propagation of cracks and fractographs with polarization current density was observed by means of optical microscope and SEM.The threshold values, propagation of cracks and fractographs for SCC and HIC were compared.The results indicated that SCC of 50Mn18Cr4WN steel in the nitrate aqueous solution without applied current is controlled by anodic dissolution.更多还原