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通过疲劳升降法对汽轮机叶片钢2Cr11Mo1NiWVNbN在100℃下的疲劳强度(107)进行测定,分别用经验公式、Basquin模型和Langer模型对测定结果进行计算和验证。结果表明:2Cr11Mo1NiWVNbN钢在100℃下的条件疲劳极限为530 MPa,大于由经验公式计算的411 MPa,这是由于M23C6析出相弥散强化及Cr和Mo元素提高了钢的淬透性所致;Langer模型对条件疲劳极限的拟合结果比Basquin模型更接近实测值,且Langer模型拟合得到的不同存活率下条件疲劳极限的分散性较小,建议在计算2Cr11Mo1NiWVNbN钢的疲劳强度时采用Langer模型。
The fatigue strength (100) of turbine blade steel 2Cr11Mo1NiWVNbN at 100 ℃ was measured by fatigue method. The empirical formula, Basquin model and Langer model were used to calculate and verify the fatigue strength. The results show that the fatigue limit of 2Cr11Mo1NiWVNbN steel is 530 MPa at 100 ℃, which is larger than 411 MPa calculated by empirical formula. This is attributed to the dispersion strengthening of precipitated phases of M23C6 and the increase of hardenability of steel by Cr and Mo elements. The fitting results of the model to the conditional fatigue limit are closer to the measured values than those of the Basquin model, and the dispersity of the conditional fatigue limit under different survival rates fitted by the Langer model is small. It is suggested that the Langer model be used in calculating the fatigue strength of 2Cr11Mo1NiWVNbN steel.