Influence of Stress Relieving Annealing Process on Forging TA7 Titanium Alloy Machinability

doi:10.3901/JME.2022.13.298

Abstract

Abstract: TA7 titanium alloy (Ti-5Al-2.5Sn) has excellent room temperature and high temperature fracture roughness in annealed state. Especially, after undergoing stress relieving annealing the forging TA7 titanium alloy can be machined. The stress relieving annealing is a link between the forging process and machining process, can regulate and control the mechanical properties and machinability of workpiece through the change of microstructure. In this paper forging TA7 titanium alloy was stress relieving annealed at the temperatures of 600℃, 800℃, 1 000℃, three microstructures were gained. The fine secondary α phase and equiaxed primary α phase of the 800℃ specimen reduced cutting temperature and cutting forces, intensified the formation of the chip serrated structure. The lamellar β phase and coarse α phase of the 1 000℃ specimen decreased the cutting temperature, increased the cutting forces, intensified the formation of the chip serrated structure, but reduced the chip bulge angle and the chip shear strain.

Key words: TA7 titanium alloy, stress relieving annealing, microstructure, mechanical properties, machinability

CLC Number:

GT506

SUN Fujian, XIAO Gang, JIANG Zhixian, LI Shichun, WAN Keqian. Influence of Stress Relieving Annealing Process on Forging TA7 Titanium Alloy Machinability[J]. Journal of Mechanical Engineering, 2022, 58(13): 298-306.

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