• Skorupska, Monika
• Kulczyk, Mariusz
• Niczyporuk, Krzysztof
• Skiba, Jacek
• Przybysz-Gloc, Sylwia

Abstract

<jats:title>Abstract</jats:title><jats:p>The study aimed to examine the effect of the hydrostatic extrusion (HE) process on the machinability of Ti grade 2 (Ti) in the turning process. After the deformation with true strain ɛ = 2.28, the microstructure was significantly refined to a grain size of 100 nm, resulting in an increase in the mechanical properties, <jats:italic>UTS</jats:italic> strength by 190%, <jats:italic>YS</jats:italic> yield strength by 230%Cutting forces for Ti in the initial state and after HE were analyzed at cutting depths <jats:italic>a</jats:italic><jats:sub><jats:italic>p</jats:italic></jats:sub> = 0.3 mm and 0.5 mm, the variables were cutting speed <jats:italic>V</jats:italic><jats:sub><jats:italic>c</jats:italic></jats:sub> (20, 30 and 50 m/min) and feed rate <jats:italic>f</jats:italic> (0.08 and 0.13 m/s).The impact of the microstructure refinement in Ti after HE on the high cutting depth machinability deterioration (<jats:italic>a</jats:italic><jats:sub><jats:italic>p</jats:italic></jats:sub> = 0.7 mm) was identified. This phenomenon is particularly noticeable at lower cutting speeds <jats:italic>V</jats:italic><jats:sub><jats:italic>c</jats:italic></jats:sub> = 20 and 30 m/min at which cutting forces are higher. Application tests of Ti after HE showed a significantly lower susceptibility to buckling during threading. As a result of the tests carried out for the Ti in the initial state, it was not possible to achieve the tolerance of pitch diameter of the thread required by standards, <jats:italic>d</jats:italic><jats:sub><jats:italic>2</jats:italic></jats:sub> at two of the three cutting depths tested. In turn, for the Ti after HE, the thread tolerances required by the standards were achieved for all tested cutting depths.</jats:p>

Topics

• impedance spectroscopy
• polymer
• grain
• grain size
• strength
• yield strength
• susceptibility
• hydrostatic extrusion