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Failure analysis of a first stage gas turbine blade

机译：一级燃气轮机叶片的故障分析

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The component under evaluation was the first stage blade of a 85 MW power plant gas turbine (MW 701 B), with the gas inlet temperature of 1000 °C and also the first stage blades temperature of 800 °C (according to the technical information [1,2]). The whole turbine consists of four stages of nozzles and blades. The blade is made of nickel-base UDIMET 520 super-alloy by means of forging and with MCrAlY coating. The nominal composition of this alloy is given in Table 1. The blades are cooled by convection system through cooling channels in longitudinal section of the blades. The consuming fuel of the unit has been gasoline for 4 months of the year and for the left 8 months natural gas has been consumed. The evaluation was carried out after 23,872 h under operation of the gas turbine in mode of base load with about 183 cycles of start-ups and shut-downs during this period [1-3].
机译：被评估的组件是一台85 MW发电厂燃气轮机（MW 701 B）的第一级叶片，进气温度为1000°C，第一级叶片温度为800°C（根据技术信息[ 1,2]）。整个涡轮机由四个阶段的喷嘴和叶片组成。刀片由镍基UDIMET 520超级合金通过锻造和MCrAlY涂层制成。该合金的标称成分在表1中给出。叶片通过对流系统通过叶片纵向截面中的冷却通道进行冷却。该单元一年中的四个月消耗的燃料是汽油，剩下的八个月消耗了天然气。评估是在燃气轮机在基本负荷模式下运行23,872小时后进行的，在此期间大约有183次启动和关闭循环[1-3]。

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