汽轮机叶片钢2Cr11Mo1NiWVNbN的疲劳强度研究  

Study on Fatigue Strength of 2Cr11Mo1NiWVNbN Steel for Turbine Blades

作　　者：郑国华[1] 宋小龙[2] 赵阳[1] 

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023 [2]西安交通大学,陕西西安710049

出　　处：《材料开发与应用》2014年第4期8-13,共6页Development and Application of Materials

基　　金：技术基础项目(Z082012T001)

摘　　要：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 of 2Cr11Mo1 NiWVNbN steel for turbine blades was measured by the staircase method,and the measurements was also calculated and verified through the empirical formulas,Basquin model and Langer model respectively.The results showed that the conditional fatigue limit of 2Cr11Mo1 NiWVNbN steel was 530 MPa at 100℃ which would be greater than that of 411 MPa calculated by the empirical formula. This was caused by dispersion strengthening of M23C6 precipitated phases and improved the hardenability of the test steel by Cr and Mo elements. The conditional fatigue limit of Langer model fitting was closer to measurements than that of Basquin model fitting,and the fatigue limit stress with different expected survivability fitted through Langer model had a smaller dispersion than that fitted through Basquin model. It was suggested that Langer model should be adopted to calculate the fatigue strength of 2Cr11Mo1 NiWVNbN steel.

关 键 词：升降图 疲劳极限 P-S-N曲线 弥散强化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]