Scholarlink

<p>The microstructural stability and elevated temperature properties of precipitation-strengthened nickel-based superalloys are co-regulated by the synergistic interactions of alloying elements and phase evolution behavior. This review systematically examines the effects of solid solution-strengthening elements (Co, Cr, W, Mo, Re, and Ru), precipitation-strengthening elements (Al, Ti, Nb, and Ta), and grain boundary-strengthening elements (C, B, Zr, and Hf) on γ/γ′ microstructural stability, topologically close-packed (TCP) phase precipitation propensity, and carbide decomposition pathways. Key findings demonstrate that γ′ coarsening kinetics exhibit a pronounced correlation with the Ti/Al ratio. A reduced Ti/Al ratio suppresses γ′ coarsening while preserving spherical morphology, whereas an elevated Ti/Al ratio enhances anti-phase boundary (APB) energy but accelerates γ′ cuboidal transformation and brittle phase formation. The individual and synergistic effects of refractory elements (Ta, Mo, W, Nb, and Re) on the evolution of the γ′ phase should not be underestimated, as their influence on Al/Ti site occupancy preferences and solute partitioning thermodynamics fundamentally governs the temporal evolution of γ′ coarsening kinetics. The synergistic effect of Re and Ru effectively suppresses TCP phase precipitation while simultaneously necessitating precise control of the Ta/W ratio (− 0.5) to optimize γ′ coarsening kinetics. Carbide stability is governed by elemental bonding capacity and diffusion kinetics, with Hf significantly enhancing MC carbide thermal stability. The decomposition of primary MC carbides is regulated by (W + Mo)/Cr and Nb/Ti ratios. Trace additions of B, C, and Zr refine grain boundary carbides to improve creep resistance; yet, excessive concentrations promote TCP phase nucleation. Future alloy design strategies must integrate multiscale simulations with high-throughput experimentation to establish dynamic predictive models correlating “composition-interface energy-phase stability”. This framework enables synergistic suppression of deleterious η, <i>δ</i>, and TCP phases while optimizing multiphase interfaces (γ/γ′, γ/γ′′, γ/γ′/γ′′), thereby achieving concurrent enhancement of strength and service life under prolonged high-temperature conditions.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A review on microstructural stability regulation in nickel-based superalloys: synergistic effects of alloying elements and phase stability optimization

  • 期刊论文

  • 发表日期：

    2025年5月31日

查看全文
  • Yingche Ma,
  • Yang Li,
  • Meiqiong Ou,
  • Kunlei Hou,
  • Xianchao Hao,
  • Min Wang

摘要

The microstructural stability and elevated temperature properties of precipitation-strengthened nickel-based superalloys are co-regulated by the synergistic interactions of alloying elements and phase evolution behavior. This review systematically examines the effects of solid solution-strengthening elements (Co, Cr, W, Mo, Re, and Ru), precipitation-strengthening elements (Al, Ti, Nb, and Ta), and grain boundary-strengthening elements (C, B, Zr, and Hf) on γ/γ′ microstructural stability, topologically close-packed (TCP) phase precipitation propensity, and carbide decomposition pathways. Key findings demonstrate that γ′ coarsening kinetics exhibit a pronounced correlation with the Ti/Al ratio. A reduced Ti/Al ratio suppresses γ′ coarsening while preserving spherical morphology, whereas an elevated Ti/Al ratio enhances anti-phase boundary (APB) energy but accelerates γ′ cuboidal transformation and brittle phase formation. The individual and synergistic effects of refractory elements (Ta, Mo, W, Nb, and Re) on the evolution of the γ′ phase should not be underestimated, as their influence on Al/Ti site occupancy preferences and solute partitioning thermodynamics fundamentally governs the temporal evolution of γ′ coarsening kinetics. The synergistic effect of Re and Ru effectively suppresses TCP phase precipitation while simultaneously necessitating precise control of the Ta/W ratio (− 0.5) to optimize γ′ coarsening kinetics. Carbide stability is governed by elemental bonding capacity and diffusion kinetics, with Hf significantly enhancing MC carbide thermal stability. The decomposition of primary MC carbides is regulated by (W + Mo)/Cr and Nb/Ti ratios. Trace additions of B, C, and Zr refine grain boundary carbides to improve creep resistance; yet, excessive concentrations promote TCP phase nucleation. Future alloy design strategies must integrate multiscale simulations with high-throughput experimentation to establish dynamic predictive models correlating “composition-interface energy-phase stability”. This framework enables synergistic suppression of deleterious η, δ, and TCP phases while optimizing multiphase interfaces (γ/γ′, γ/γ′′, γ/γ′/γ′′), thereby achieving concurrent enhancement of strength and service life under prolonged high-temperature conditions.

Graphical abstract