Effect of Al/Ti Ratio on Hot Deformation Characteristics and Microstructure Evolution of 15Cr-30Ni-Fe Heat-Resistant Alloy

IF 2.2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Engineering and Performance Pub Date : 2024-09-04 DOI:10.1007/s11665-024-10023-6

Huai Zhang, Chengbin Shi, Shizhou Wang, Peng Lan, Jing Li

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Abstract

The hot deformation behavior, microstructure evolution and dynamic recrystallization mechanism of the newly designed 15Cr-30Ni-Fe heat-resistant alloy were studied. The flow curves of the alloy exhibit obvious dynamic recrystallization characteristics of a single stress peak, and the increase in Al/Ti ratio enhances the deformation resistance of the alloy during hot working. The constitutive equation corrected by strain compensation was established. The processing map of the alloy was constructed based on the dynamic material model, and the accuracy of the processing map was confirmed by checking the evolution of the microstructure. With the increase in Al/Ti ratio, the optimum hot working window of the alloys at a strain of 0.9 is broadened from 1050-1150 °C/0.01-0.1 s⁻¹ to 1015-1150 °C/0.01-0.57 s⁻¹. The strain-induced precipitation of nano-sized Laves phase, (Ti,Nb)C and γ'-Ni₃(Ti, Al, Nb) pinning the movement of dislocations and grain boundaries in the alloy with a high Al/Ti ratio hinders the growth of DRX grains. The dynamic recrystallization mechanism in 15Cr-30Ni-Fe heat-resistant alloy is mainly discontinuous dynamic recrystallization (DDRX) with grain boundary bulge, supplemented by continuous dynamic recrystallization (CDRX) with sub-grain nucleation.

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铝钛比对 15Cr-30Ni-Fe 耐热合金热变形特性和显微组织演变的影响

研究了新设计的 15Cr-30Ni-Fe 耐热合金的热变形行为、显微组织演变和动态再结晶机理。合金的流动曲线表现出明显的单应力峰动态再结晶特征，Al/Ti 比的增加增强了合金在热加工过程中的抗变形能力。建立了经应变补偿校正的构效方程。根据动态材料模型构建了合金的加工图，并通过检查显微组织的演变证实了加工图的准确性。随着铝钛比的增加，合金在应变为 0.9 时的最佳热加工窗口从 1050-1150 °C/0.01-0.1 s-1 扩大到 1015-1150 °C/0.01-0.57 s-1。应变诱导的纳米级 Laves 相、(Ti,Nb)C 和 γ'-Ni3(Ti,Al,Nb)的析出阻碍了高 Al/Ti 比合金中位错和晶界的移动，从而阻碍了 DRX 晶粒的生长。15Cr-30Ni-Fe 耐热合金的动态再结晶机制主要是晶界凸起的不连续动态再结晶（DDRX），并以亚晶粒成核的连续动态再结晶（CDRX）为辅。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered