加载速率对30Cr1Mo1V汽轮机转子钢低周疲劳特性的影响  

Effect of Loading Rate on Low-cycle Fatigue Properties of 30Cr1Mo1V Rotor Steel

作　　者：陈荐[1] 何建军[1] 孙清民[1] 任延杰[1] 付浩[1] 胡敏[1] 

机构地区：[1]长沙理工大学能源与动力工程学院,长沙410076

出　　处：《动力工程学报》2010年第9期711-714,719,共5页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(50775015);湖南省教育厅重点科研资助项目(06A002)

摘　　要：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.The effects of loading rate on the low-cycle fatigue properties of 30Cr1Mo1V steam turbine rotor steel, respectively for the loading rate 0. 1%/s, 0.3%/s and 0.5%/s, were studied in a RDL 05 electronic creep fatigue test machine using a total strain controlled method, while following relationships proposed respectively between loading rates and steel stress, loading rates and low-cycle fatigue life as welt as low- cycle fatigue life and total strain amplitude at 538℃. Results show that at 538 ℃, with the increase of loading rate, the rotor steel cyclic stress increases and low-cycle fatigue life is prolonged. Under the same strain, the greater the loading rate is, the bigger the corresponding stress amplitude will be. With rising strain amplitute, the stress increases and the low-cycle fatigue life is shortened.

关 键 词：汽轮机 转子 30Cr1Mo1V钢 低周疲劳 加载速率 寿命预测 

分 类 号：TH140.1[一般工业技术—材料科学与工程]