Effect of temperature and strain rate on the hot workability behaviour of Ni–25Cr–14W superalloy: An approach using processing map and constitutive equation

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research Pub Date : 2024-07-22 DOI:10.1557/s43578-024-01390-w

Ravi Ranjan Kumar, Randhir Kumar Singh, Varsha Florist, Namit Pai, C. R. Anoop, Debasis Tripathy, S. V. S. Narayana Murty

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Abstract

The hot workability of Ni–25Cr–14W alloy is studied through isothermal hot compression tests in the temperature (T) range of 1000–1200 °C and in the strain rates(ε̇) of 0.001–10 s⁻¹ in a thermomechanical simulator. Flow stress data show stable flow curves at T > 1050 °C and ε̇ < 0.1 s⁻¹. The values of flow stress decrease with increase in T or decrease in ε̇. Based on processing map, safe region for hot workability has been identified in the temperature range of 1000–1200 °C and ε̇ of 0.001–0.1 s⁻¹ with maximum efficiency(η) of ~ 44% at 1175 °C and 0.001 s⁻¹. Dynamic recrystallization has been identified as the softening mechanism operating in the material at high temperature and lower ε̇. Incomplete recrystallization of the microstructures was noted during multi-step forging by varying T or ε̇, indicating the importance of maintaining the same during industrial processing.

Graphical abstract

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温度和应变率对 Ni-25Cr-14W 超合金热加工性能的影响：使用加工图和构成方程的方法

在热机械模拟器中，通过温度（T）范围为 1000-1200 °C、应变率（ε态）为 0.001-10 s-1 的等温热压缩试验研究了 Ni-25Cr-14W 合金的热加工性能。流动应力数据显示，在温度为 1050 °C 和应变速率为 0.1 s-1 时，流动应力曲线比较稳定。流动应力值随着温度的升高或ε̇ 的减小而减小。根据加工图，确定了热加工的安全区温度范围为 1000-1200 ℃，ε̇ 为 0.001-0.1 s-1，在 1175 ℃ 和 0.001 s-1 时最大效率（η）约为 44%。动态再结晶已被确定为高温和较低ε̇ 时材料的软化机制。在改变温度或ε̇ 的多步锻造过程中，发现微观结构未完全再结晶，这表明在工业加工过程中保持相同温度和ε̇ 的重要性。

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来源期刊

Journal of Materials Research 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.70%

发文量

362

审稿时长

2.8 months

期刊介绍： Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome. • Novel materials discovery • Electronic, photonic and magnetic materials • Energy Conversion and storage materials • New thermal and structural materials • Soft materials • Biomaterials and related topics • Nanoscale science and technology • Advances in materials characterization methods and techniques • Computational materials science, modeling and theory