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对通过d电子理论以及电子空位数理论在现有第三代镍基单晶合金基础上进行成分设计,控制合金中Cr、Mo、Al、Re、Hf元素含量不变,通过增加合金中W含量以及添加元素Nb、Ti强化γ′相,微调合金中Ta/(W+Mo)比值和Al/Ti比值,并对合金中TCP相的析出以及合金相稳定性进行预测,来提高合金的高温性能,得到一系列的合金成分范围。利用热模拟软件JMat Pro,并结合相图分析,获得一系列低Re合金成分,通过对已有镍基单晶合金在平衡状态下热处理窗口、糊状区间、TCP相含量、熔点、密度等热力学参数进行模拟,并依据这些参数制定合金设计判据,得到新型低铼第三代镍基单晶合金的组成。
Based on the d electron theory and electron gap theory, the composition of Cr, Mo, Al, Re, Hf in the third generation Ni-based single crystal alloy is controlled based on the existing theory. By increasing the content of W in the alloy As well as the addition of Nb and Ti to strengthen the γ ’phase, finely tune the Ta / (W + Mo) ratio and the Al / Ti ratio in the alloy, and predict the precipitation of the TCP phase in the alloy and the phase stability of the alloy to improve the high temperature performance of the alloy , Get a range of alloy composition. A series of low Re alloy compositions were obtained by using thermal simulation software JMat Pro and phase diagram analysis. Through the comparison of thermodynamics, such as heat treatment window, pasty section, TCP phase content, melting point and density of the existing single crystal nickel- Parameters were simulated, and based on these parameters to develop alloy design criteria, get the new low rhenium third generation nickel-based single crystal alloy composition.