On quantifying the strain rate during chip formation when machining aerospace alloy Ti-5553

摘要

Titanium-5Al-5Mo-5V-3Cr-0.5Fe (Ti-5553) is a recently developed modification of Russian Ti alloy VT-22, which has applications in the aerospace industry for key components such as landing gear. However, Ti-5553 has shown poorer machinability than other Ti alloys. The main objective of the present study is examined the chip formation and to calculate, from metallographic observations, the shear strains and strain rates both within the segments of chip and within the narrow shear bands. Cutting tests were conducted under three levels of cutting speeds and feeds and the obtained chips were collected and analyzed. The study has revealed lower strain and strain rates values than what was predicted in previous studies. The obtained results have also been quantified in relation to cutting condition to build a database for further and more detailed numerical investigation.