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

ZHU Baojie; CHEN Hongwu; MENG Yi

doi:10.3969/j.issn.1674-6457.2025.11.008

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (11) : 93-104. DOI: 10.3969/j.issn.1674-6457.2025.11.008

Intelligent Processing of Advanced Materials

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

ZHU Baojie, CHEN Hongwu, MENG Yi^*

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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.

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Ti-55531 / multi-directional forging / thermal deformation behavior / microstructure evolution / hot processing map

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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

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