镍基高温合金定向结晶性能的预测

O. Glotka, V. Olshanetskii
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引用次数: 0

摘要

这项工作的目的是获得预测回归模型,有可能充分计算耐热镍合金的力学性能,而不需要事先的实验。选取国内外生产的定向结晶工业合金进行研究。通过最小二乘方法处理这些值,以获得与最优描述这些依赖关系的回归模型的数学方程的接收的相关性。通过对实验数据的处理,首次提出了考虑合金主要成分复杂影响的合金力学性能的合金元素比值。由于晶格参数的尺寸失配与γ-和γ′相固溶硬化浓度、合金弥散硬化效率、蠕变速率和其他性能有关,因此所获得的比值可以将这些性能与多组分体系联系起来。建立了回归模型,可以高精度地计算合金的尺寸失配、强度、耐热性、相数和密度。建立了成分对定向结晶耐热镍合金性能影响的规律。结果表明,对于多组分镍体系,有可能出现高概率失配,这对该类合金的强度特性有显著影响。失配值的减小伴随着元素在-固溶体中溶解度的增大,此时合金元素的比例为1.5 ~ 1.6。然而,合金元素大于2的比例的增加伴随着错配的增加,因为-固溶体已经达到溶解的最大值。指出了在开发新型耐热镍合金和完善该类已知工业标志结构时,对影响合金综合使用性能的基本特性进行预测的前景和有效方向。关键词:镍基高温合金,尺寸失配(γ / γ′-失配),强度,耐热性
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Predicting the properties of nickel-based superalloys directional crystallization
The aim of this work is to obtain predictive regression models, with which it is possible to adequately calculate the mechanical properties of heat-resistant nickel alloys, without prior experiments. Industrial alloys of directional crystallization of domestic and foreign production were selected for research. The values were processed by the method of least squares to obtain correlations with the receipt of mathematical equations of regression models that optimally describe these dependencies. As a result of processing of experimental data, the ratio of alloying elements which can be used for an estimation of mechanical properties taking into account complex influence of the main components of an alloy is offered for the first time. Since the dimensional mismatch of the lattice parameters is associated with the degree of concentration of solid-soluble hardening of γ- and γ'-phases, the efficiency of dispersion hardening of the alloy, creep rate and other properties, the obtained ratio allows to link these properties with multicomponent systems. Regression models are presented, with the help of which it is possible to calculate dimensional mismatch, strength, heat resistance, number of  phases and density of alloys with high accuracy. The regularities of the composition influence on the properties of heat-resistant nickel alloys of directional crystallization are established. It is shown that for multicomponent nickel systems it is possible to predict with high probability misfit, which significantly affects the strength characteristics of alloys of this class. The decrease in the value of misfit is accompanied by an increase in the solubility of the elements in the -solid solution at a value of the ratio of alloying elements of 1.5 - 1.6. However, an increase in the ratio of alloying elements greater than 2 is accompanied by an increase in misfit, because the -solid solution has reached a maximum of dissolution. The perspective and effective direction in the decision of a problem of forecasting of the basic characteristics influencing a complex of service properties of alloys both at development of new heat-resistant nickel alloys, and at perfection of structures of known industrial marks of this class is shown. Keywords: nickel-based superalloys, dimensional mismatch (γ / γ'- mismatch), strength, heat resistance.
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发文量
15
审稿时长
8 weeks
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