Abstract
Research on pre-deformation influences on material properties in multistep hot forming is of important scientific interest. In this paper, hot tensile tests at 850 °C and a strain rate of 0.001 s−1 were performed to study the microstructural evolution and mechanical properties of Ti-6Al-4V with pre-strains at 0.05, 0.1 and 0.15. The tensile test results showed that the specimen with 0.05 pre-strain exhibited higher flow stress and larger elongation. Additionally, increasing the pre-strain resulted in a decrease in ultimate tensile strength (UTS) and elongation (EL). The EBSD results showed that the main deformation mechanism of Ti-6Al-4V was high-angle grain boundary sliding. Pre-strain promoted dynamic recrystallization (DRX) by increasing the deformation substructure. The refinement of grains and the eradication of dislocations enhanced the deformability, resulting in an increase in flow stress.
Highlights
Titanium alloys have a wide range of applications in aerospace and other industries due their high specific strength, corrosion resistance, high temperature resistance, etc. [1,2]
Ti-6Al-4V was the first titanium alloy put into structural production of which the long-term service temperature can reach 400 ◦C
It is obvious that the tensile behavior was affected by the pre-deformation
Summary
Titanium alloys have a wide range of applications in aerospace and other industries due their high specific strength, corrosion resistance, high temperature resistance, etc. [1,2]. Titanium alloys have a wide range of applications in aerospace and other industries due their high specific strength, corrosion resistance, high temperature resistance, etc. Ti-6Al-4V was the first titanium alloy put into structural production of which the long-term service temperature can reach 400 ◦C. Ti-6Al-4V is mainly used to manufacture aero-engine compressor discs and blades [3]. Ti-6Al-4V has been selected to manufacture hollow aero-engine blades for weight reduction. The hollow blade forming process consists of diffusion bonding, hot twisting, hot stamping, and gas bulging. To investigate the hot twisting procedure influence on Ti-6Al-4V deformation behavior in the subsequent hot stamping process, it is necessary to study the microstructural evolution and deformation mechanisms of Ti-6Al-4V with pre-strain [5,6,7]
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