The Study On Low-Cycle Fatigue Property Of Rotor Steel Under Different Temperatures

With the developments of modern steam turbines,which work under conditions of high pressure and elevated-temperature,especially atomic power stations are designed and made,the reliability and safety are strict with the stucture. The rotor is an important part of steam turbines which inevitably have some defects during the process of manufacture. It is important to adopt the forecasting design of evaluating fatigue life.In this paper,compared with the property of foreign similar materials,it is found that they are in the same level. For rotor steel(30CrlMolV steel),the tests of low-cycle fatigue property are done under different temperatures. The fatigue life under different temperatures is researched to make up for the defects of the testing for foreign similar materials. When pull-stretch data is attempted to evaluate low-cycle fatigue data,the result shows that four-point associated method in middle-low life zone is done well under room temperature,but there are large errors of four-point associated method and general-slope method under other temperatures. So further research work is needed.