Abstract

Results of the study of the chemical composition of contacting γ- and γ'-phase particles in a granular heat-resistant nickel alloy (HNA) VV751P (Ni–15Co–12Cr–0.7V–0.3C–0.9W–2.7Mo–3.4Ti–2.0Nb–8.3Al–0.02Hf–0.008B, at %) by atom probe tomography are analyzed. Experimental and literature data on the preferential location of alloying elements in γ- and γ'-phase particles in different heat-resistant nickel alloys are considered. A criterion for the characterization of each of elements based on the ratio K = Е_v/r² (where Е_v is the number of valence electrons and r is the atomic radius of an element) is suggested. It is shown that the higher the K value, the more probable the enrichment of γ-phase particles in this element and the higher the degree of such an enriching. The lower the K value, the more probable the enrichment of γ'‑phase particles in this element and the higher the degree of such an enriching. The effect of γ- and γ'-forming elements in heat-resistant nickel alloys and other factors on the stability of the γ- and γ' phases, mechanical characteristics of disc heat-resistant nickel alloys at room temperature, and long-term strength at operating temperatures is discussed.

中文翻译：

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耐热镍合金中γ-和γ'-相粒子间合金元素原子的分布

摘要

粒状耐热镍合金 (HNA) VV751P (Ni–15Co–12Cr–0.7V–0.3C–0.9W–2.7Mo–3.4) 接触 γ 相和 γ' 相颗粒的化学成分研究结果Ti–2.0Nb–8.3Al–0.02Hf–0.008B, at %) 通过原子探针断层扫描进行分析。考虑了不同耐热镍合金中γ-和γ'-相颗粒中合金元素的优先位置的实验和文献数据。建议基于比率K = Е _v / r ²（其中Е _v是价电子数，r是元素的原子半径）来表征每种元素的特征。表明K越高值，γ相粒子在该元素中富集的可能性越大，富集程度越高。K值越低，γ'相粒子在该元素中富集的可能性越大，富集程度越高。耐热镍合金中γ-和γ'-形成元素等因素对γ-和γ'相稳定性、盘状耐热镍合金室温力学特性和长期强度的影响在工作温度下进行了讨论。