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以30Cr1Mo1V汽轮机转子钢为研究材料,选取0.1%/s、0.3%/s和0.5%/s的加载速率,采用控制总应变的方法,在RDL 05电子蠕变疲劳试验机上研究了加载速率对材料低周疲劳特性的影响.同时,还提出在538℃下加载速率对30Cr1Mo1V汽轮机转子钢应力和低周疲劳寿命影响的关系式以及低周疲劳寿命与总应变幅值的关系式.结果表明:在538℃时,随着加载速率的提高,转子钢循环应力增大,低周疲劳寿命延长;在同一应变下,加载速率越大,所对应的应力幅值越大;随着应变幅值的增大,应力增大,低周疲劳寿命缩短.
Taking the 30Cr1Mo1V turbine rotor steel as the research material, the loading rates of 0.1% / s, 0.3% / s and 0.5% / s were selected. The total strain was used to investigate the effect of loading rate on the mechanical properties of the material The relationship between low-cycle fatigue life and low-cycle fatigue life and the relation between the low-cycle fatigue life and the total strain amplitude of the steel were investigated. At 538 ℃, with the increase of the loading rate, the cyclic stress of the rotor steel increases and the fatigue life of the low cycle increases. Under the same strain, the larger the loading rate, the larger the stress amplitude. With the increase of the strain amplitude Large, increased stress, short cycle fatigue life shortened.