Effect of Structural-Phase State on the Deformation Behavior and Mechanical Properties of Near β Titanium Alloy VT22 in the Temperature Range 293–823 K

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Physical Mesomechanics Pub Date : 2024-06-21 DOI:10.1134/s1029959924030081

G. P. Grabovetskaya, I. P. Mishin, E. V. Naydenkin, I. V. Ratochka, E. N. Stepanova, O. V. Zabudchenko, O. N. Lykova

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Abstract

This paper investigates the effect of thermomechanical treatments, including deformation by radial shear rolling or severe plastic deformation by abc pressing with subsequent aging at 773 K, on the structural-phase state, deformation behavior, and mechanical properties of commercial near β titanium alloy VT22 (Ti–5Al–5Mo–5V–1Cr–1Fe). The structure of the alloy after radial shear rolling and subsequent aging consists of transformed β grains with a lamellar α + β structure and primary α-phase particles. Severe plastic deformation of the alloy followed by aging causes the formation of a grain-subgrain α + β structure with an average characteristic size of 0.23 µm. It is found that, after the thermomechanical treatments, the strength characteristics of the alloy at room temperature increase by ~40% compared to the as-received alloy. The alloy after radial shear rolling and aging retains a 40–20% higher strength in the temperature range of 293–823 K. The strength of the alloy after severe plastic deformation and aging becomes lower than that of the as-received alloy already at a temperature of 773 K. Analysis of creep parameters at 743 K shows that the creep deformation of the alloy in the state after radial shear rolling and aging occurs by the motion of dislocations (glide + climb). The creep deformation of the alloy in the state after severe plastic deformation and subsequent aging is largely contributed by grain boundary sliding.

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结构相态对温度范围为 293-823 K 的近β钛合金 VT22 的变形行为和力学性能的影响

摘要本文研究了热机械处理（包括径向剪切轧制变形或abc压制严重塑性变形并随后在773 K下时效）对商用近β钛合金VT22（Ti-5Al-5Mo-5V-1Cr-1Fe）的结构相态、变形行为和机械性能的影响。经过径向剪切轧制和随后的时效处理后，合金的结构由具有片状 α + β 结构的转化 β 晶粒和原生 α 相颗粒组成。合金的严重塑性变形和随后的老化导致形成平均特征尺寸为 0.23 µm 的晶粒-亚晶粒 α + β 结构。研究发现，经过热机械处理后，合金在室温下的强度特性比初始合金提高了约 40%。743 K 时的蠕变参数分析表明，合金在径向剪切轧制和时效处理后的蠕变变形是通过位错运动（滑行 + 爬升）发生的。合金在严重塑性变形和随后的老化之后的蠕变变形主要是由晶界滑动引起的。

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来源期刊

Physical Mesomechanics Materials Science-General Materials Science

CiteScore

3.50

自引率

18.80%

发文量

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.