论文部分内容阅读
对一种新型叶片钢在室温大气、80℃22%NaCl溶液和95℃水蒸汽中进行腐蚀疲劳试验,测定了此钢在不同腐蚀环境下的拉压疲劳S-N曲线,利用金相显微镜和显微硬度计分析了显微组织和显微硬度的分布,用扫描电镜分析了疲劳断口。结果表明,80℃22%NaCl溶液和95℃水蒸汽分别使新型叶片钢的疲劳极限比室温大气下的疲劳极限降低了32.60%和11.84%。疲劳源都位于试样表面。80℃22%NaCl溶液中的腐蚀疲劳断口没有明显的疲劳辉纹,室温大气和95℃水蒸汽中的疲劳断口都出现了疲劳辉纹,后者的疲劳断口还出现了大量的解理裂纹。
Corrosion fatigue test was carried out on a new type of blade steel in room temperature atmosphere, 80 ℃ 22% NaCl solution and 95 ℃ water vapor. The tensile and compression fatigue SN curve of the steel was measured under different corrosive environments. The hardness tester analyzed the distribution of the microstructure and the microhardness, and analyzed the fatigue fracture by SEM. The results show that the fatigue limit of the new leaf steel is reduced by 32.60% and 11.84%, respectively, compared with the fatigue limit at room temperature in the atmosphere of 80% NaCl solution and 95% water vapor. Fatigue sources are located on the specimen surface. Corrosion fatigue fracture in 80 ℃ 22% NaCl solution showed no obvious fatigue fringes, fatigue fatigue appeared in both the ambient air and the fatigue fracture in water vapor at 95 ℃, and a large number of cleavage cracks appeared in the fatigue fracture of the latter.