Study of the Structure and Properties of Billets from Alloy EP741NP Obtained by Hot Isostatic Pressing

IF 0.5 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Metal Science and Heat Treatment Pub Date : 2025-07-29 DOI:10.1007/s11041-025-01137-2

A. A. Khlybov, D. A. Ryabov, A. A. Solov’ev, A. A. Shuyanova, A. A. Demchenko

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Abstract

The process of formation of the structure and properties in billets from heat-resistant nickel alloy EP741NP obtained by hot isostatic pressing (HIP) and the effect of heat treatment (HT) on its characteristics are studied. It is established that the post-HIP billets contain pores and their volume fraction is distributed nonuniformly over cross section. A digital analysis of the microstructure of the material at the periphery and in the center of the billet is used to determine the grain sizes and their anisotropy. The basic mechanical characteristics of the EP741NP alloy after the HIP and the subsequent HT (hardening and three-stage aging) are studied in the temperature range of 20 – 900°C. It is shown that the HT raises the strength characteristics of the EP741NP alloy in the whole of the temperature interval of the tests. The variation of the hardness and of the elastic and shear moduli (E and G) over cross section of the billets is determined after the HIP and subsequent HT.

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热等静压法制备EP741NP合金坯料的组织与性能研究

研究了热等静压法制备EP741NP耐热镍合金坯料的组织和性能形成过程，以及热处理对坯料组织和性能的影响。结果表明，后热处理方坯中含有气孔，且气孔体积分数在截面上的分布不均匀。对坯料外围和中心的材料微观结构进行了数字分析，以确定晶粒尺寸及其各向异性。在20 ~ 900℃的温度范围内，研究了EP741NP合金经高温淬火及后续高温淬火（硬化和三级时效）后的基本力学特性。结果表明，高温在整个试验温度区间内均提高了EP741NP合金的强度特性。坯料的硬度、弹性模量和剪切模量（E和G）在横截面上的变化是在静压和高温后测定的。

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来源期刊

Metal Science and Heat Treatment 工程技术-冶金工程

CiteScore

1.20

自引率

16.70%

发文量

102

审稿时长

4-8 weeks

期刊介绍： Metal Science and Heat Treatment presents new fundamental and practical research in physical metallurgy, heat treatment equipment, and surface engineering. Topics covered include: New structural, high temperature, tool and precision steels; Cold-resistant, corrosion-resistant and radiation-resistant steels; Steels with rapid decline of induced properties; Alloys with shape memory effect; Bulk-amorphyzable metal alloys; Microcrystalline alloys; Nano materials and foam materials for medical use.