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参照USC 141镍基合金的化学成分,进行了热力学模拟计算。计算结果表明:钨能提高M23C6和M6C的转变温度,并促进γ′相和M6C的析出。在USC 141化学成分基础上,添加钨元素取代部分钼元素,设计了一种试验型镍基合金(HR 100)。通过室、高温力学性能测试、持久试验和析出相分析,对其力学性能和析出相进行了研究。试验结果表明:经相同热处理后,试验型镍基合金HR 100中的γ′相和M6C的析出明显多于USC 141,使其室温综合力学性能、高温强度以及持久寿命均明显优于USC 141,但同时大量析出的M6C会降低其高温和持久塑性。通过调整钨和钼的含量来调节M6C相的析出量,可以作为一种提高USC 141室、高温综合性能的方法。
According to the chemical composition of USC 141 nickel base alloy, the thermodynamic simulation calculation was carried out. The results show that tungsten can increase the transition temperatures of M23C6 and M6C and promote the precipitation of γ ’and M6C. Based on the chemical composition of USC 141, a tungsten element was added to replace some molybdenum elements, and a test Ni-based alloy (HR 100) was designed. The mechanical properties and the precipitated phases were studied by room temperature, high temperature mechanical property test, long-term test and precipitation analysis. The results show that after the same heat treatment, the precipitation of γ ’phase and M6C in the test Ni-base alloy HR 100 is obviously more than that of USC 141, which makes the room temperature mechanical properties, high temperature strength and long-life are obviously better than USC 141, However, at the same time, a large amount of precipitated M6C will reduce its high temperature and ductility. By adjusting the tungsten and molybdenum content to adjust the amount of M6C precipitation, can be used as a USC Room 141 to improve the comprehensive performance.