高温下Ti-55531钛合金多向锻造热力学行为研究

朱宝洁; 陈洪伍; 孟毅

doi:10.3969/j.issn.1674-6457.2025.11.008

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (11) : 93-104. DOI: 10.3969/j.issn.1674-6457.2025.11.008

先进材料智能成形技术

高温下Ti-55531钛合金多向锻造热力学行为研究

朱宝洁, 陈洪伍, 孟毅^*

作者信息 +

Thermodynamic Behavior of Multi-directional Forging of Ti-55531 Titanium Alloy at High Temperature

ZHU Baojie, CHEN Hongwu, MENG Yi^*

Author information +

文章历史 +

摘要

目的研究大塑性变形过程中的微观组织演变机制,为钛合金宏观力学性能的调控优化提供理论基础。方法以Ti-55531钛合金为研究对象,基于动态材料模型,进行单向热压缩实验和多向锻造实验,绘制不同应变条件下的热加工图,分析合金的功率耗散特性及失稳区分布情况,为优化热加工工艺参数提供理论依据。研究了Ti-55531钛合金在双相区多向锻造过程中的微观组织演变规律,分析不同锻造温度（770~830 ℃）和加工道次（1~3次）对合金微观组织形貌、尺寸、相变演化的影响。总结热变形过程中的合金晶粒组织均匀化规律,为制备高性能钛合金锻坯提供理论依据和技术支持。结果当合金温度为780~820 ℃、应变速率0.01~0.36 s^-1时,为高功率耗散因子（η>0.3）变形条件下较佳的加工窗口;随着变形温度的升高,α相析出减少,β基体中的高角度晶界比例增加,晶粒细化程度提高;β晶粒尺寸随着应变量的累计显著减小（10.96、4.73、4.22 μm;800 ℃）。结论多向锻造在弱化织构强度、改善材料各向同性、提高组织均匀性和细化晶粒方面表现出优异效果。在800 ℃、2道次的工艺参数下,多向锻造晶粒组织尺寸调控最好。

Abstract

The work aims to investigate the evolution mechanism of the microstructure during severe plastic deformation, thereby providing a theoretical basis for the regulation and optimization of the macroscopic mechanical properties of titanium alloys. With Ti-55531 titanium alloy as the research object, based on the dynamic material model (DMM), uniaxial hot compression experiments and multi-directional forging experiments were conducted. The hot processing maps under different strain conditions were plotted, and the power dissipation characteristics and the distribution of instability regions of the alloy were analyzed, which provided a theoretical basis for optimizing hot processing parameters. Additionally, the evolution law of the microstructure of Ti-55531 titanium alloy during multi-directional forging in the dual-phase region was studied. The effects of different forging temperatures (770-830 ℃) and processing passes (1-3 passes) on the morphology, size, and phase transformation evolution of the alloy's microstructure were analyzed. Finally, the homogenization law of the alloy's grain structure during thermal deformation was summarized to provide theoretical basis and technical support for the preparation of high-performance titanium alloy forgings. A favorable processing window for the alloy existed under the deformation conditions of temperature ranging from 780 ℃ to 870 ℃, strain rate ranging from 0.01 s^-1 to 0.36 s^-1, and corresponding high power dissipation factor (η>0.3). With the increase of deformation temperature, the precipitation of α-phase decreased, the proportion of high-angle grain boundaries in the β-matrix increased, and the degree of grain refinement was enhanced. The size of β-grains decreased significantly with the accumulation of strain (10.96, 4.73, 4.22 μm at 800 ℃). Multi-directional forging exhibits excellent effects in weakening texture strength, improving the isotropy of materials, enhancing microstructural homogeneity, and refining grains. The optimal control of the grain structure size by multi-directional forging is achieved under the process parameters of 800 ℃ and 2 passes.

导出引用

朱宝洁, 陈洪伍, 孟毅. 高温下Ti-55531钛合金多向锻造热力学行为研究[J]. 精密成形工程. 2025, 17(11): 93-104 https://doi.org/10.3969/j.issn.1674-6457.2025.11.008

ZHU Baojie, CHEN Hongwu, MENG Yi. Thermodynamic Behavior of Multi-directional Forging of Ti-55531 Titanium Alloy at High Temperature[J]. Journal of Netshape Forming Engineering. 2025, 17(11): 93-104 https://doi.org/10.3969/j.issn.1674-6457.2025.11.008

中图分类号： TG31

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