Microstructure Evolution and Mechanical Properties of the Ti6554 Titanium Alloy during Continuous Hole Rolling Process

MENG Yafei; WANG Qingmin; WU Chuan; XU Guangsheng; WANG Mengchao; YAO Lei

doi:10.3969/j.issn.1674-6457.2025.08.002

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (8) : 12-24. DOI: 10.3969/j.issn.1674-6457.2025.08.002

Light Alloy Forming

Microstructure Evolution and Mechanical Properties of the Ti6554 Titanium Alloy during Continuous Hole Rolling Process

MENG Yafei¹, WANG Qingmin², WU Chuan^1,*, XU Guangsheng³, WANG Mengchao¹, YAO Lei¹

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Abstract

The work aims to reveal the mechanical property law and microstructure evolution mechanism of the titanium alloy during hole rolling. The multi-pass groove rolling simulation of Ti6554 titanium alloy bar was conducted by the finite element software Abaqus. The effect laws of different rolling temperatures (500, 600, 700 ℃) on the rolling force of the driving roller, equivalent plastic strain and temperature distribution were investigated, and the microstructure and mechanical properties of the rolled bars under different rolling temperatures were compared. After rolling, the microstructure of the bar was more uniform, and the grain was more refined. As the rolling temperature increased, the dislocation density inside the bar material decreased significantly, the room temperature tensile strength decreased from 1 186.3 MPa to 984.4 MPa, and the yield strength decreased from 1 165.2 MPa to 953.8 MPa. However, the elongation increased from 13.1% to 27.8%, and the impact toughness increased from 10.8 J/cm² to 29.7 J/cm². Through the method of combining finite element simulation and field experiment, the exactitude and dependability of the finite element simulation are verified from the rolling force of the driving roller and the temperature and cross-section size of the bar. Under 600 ℃ rolling, the distribution of equivalent plastic strain within the bar material is more uniform, and the grain size and microstructural uniformity are significantly improved. The tensile fracture of the bar exhibits numerous and deep equiaxed dimples, indicating a ductile fracture characteristic. In contrast, under 500 ℃ rolling, the number of dimples at the fracture surface is reduced, and small cleavage planes are present, reflecting a quasi-cleavage fracture characteristic.

Key words

hole rolling / finite element simulation / equivalent plastic strain / microstructure / mechanical properties

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MENG Yafei, WANG Qingmin, WU Chuan, XU Guangsheng, WANG Mengchao, YAO Lei. Microstructure Evolution and Mechanical Properties of the Ti6554 Titanium Alloy during Continuous Hole Rolling Process[J]. Journal of Netshape Forming Engineering. 2025, 17(8): 12-24 https://doi.org/10.3969/j.issn.1674-6457.2025.08.002

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Funding

National Natural Science Found Face Items (52075386, 52475394); Tianjin Natural Science Foundation of China- Multi- input Key Projects (22JCZDJC00650)