Hot deformation behavior and microstructural evolution of ultrafine-grained TZM alloy

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-08-18 DOI:10.1016/j.ijrmhm.2025.107387

Ruyue Wang , Chengcheng Shi , Hao Qiu , Yaqin Zhou , Xuchang Cui , Hao Dong

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Abstract

This research investigated the hot deformation behavior and microstructure evolution of ultrafine-grained TZM alloy over a temperature range of 1200–1350 °C and strain rates from 0.001 to 1 s⁻¹. A strain-compensated Arrhenius constitutive model was developed and hot working maps were generated. Microstructural analysis revealed that at low temperatures and high strain rates, dynamic recrystallization (DRX) was insufficient, leading to a higher dislocation density and strong texture. As the temperature increased and the strain rate decreased, grain deformation was predominantly controlled by continuous dynamic recrystallization (CDRX). The proportion of recrystallized grains increased, as indicated by a rise in high-angle grain boundaries (HAGBs) and a reduction in dislocation density. Furthermore, the results showed that 〈100〉//CD and 〈111〉//CD were the primary slip directions. Elevated temperatures and reduced strain rates promoted the preferential growth of recrystallized grains along <100>//CD, enhancing texture strength. Based on the experimental findings, a schematic model of the microstructural evolution of ultrafine-grained TZM alloy during high-temperature deformation was proposed.

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超细晶TZM合金热变形行为及显微组织演变

研究了超细晶TZM合金在1200 ~ 1350℃、应变速率0.001 ~ 1 s−1范围内的热变形行为和显微组织演变。建立了应变补偿的Arrhenius本构模型，并生成了热加工图。显微组织分析表明，在低温和高应变速率下，动态再结晶（DRX）不足，导致位错密度较高，织构较强。随着温度的升高和应变速率的降低，晶粒变形主要由连续动态再结晶（CDRX）控制。再结晶晶粒的比例增加，表现为高角度晶界（HAGBs）的增加和位错密度的降低。< 100 > //CD和< 111 > //CD为主要滑动方向。升高的温度和降低的应变速率促进了再结晶晶粒沿<；100>；//CD的优先生长，提高了织构强度。基于实验结果，提出了高温变形过程中超细晶TZM合金组织演变的示意图模型。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.