Abstract
The effect of specific alloy elements on adiabatic shearing sensitivity was studied by cutting experiment for the industrial pure titanium (TA2) and titanium alloy (Ti-6Al-4V) in the level of valence electron structure (VES). The valence electron structure (VES) parameters that affect adiabatic shearing sensitivity were studied in this paper. The results show the electron density of heterophase boundary and the lattice electron density are related to adiabatic shearing sensitivity. The higher the electron density of heterophase boundary, the lower the lattice electron density, the higher adiabatic shearing sensitivity, and the easier the formation of the serrated chips. The electron density of heterophase boundary and the lattice electron density have coupling effect on adiabatic shearing sensitivity. The adding of Al and V elements for Ti-6Al-4V can increase the electron density of heterophase boundary and reduce the lattice electron density, so its adiabatic shearing sensitivity is higher than that of TA2, which would produce easily serrated chips divided evenly by the adiabatic shear band (ASB) and enlarge the degree of serration to exacerbate the tool vibration.
Highlights
At present, the high-speed cutting has been the developing direction of machining technology
Overview on the research development of adiabatic shear band (ASB), the study of its formation mechanism and affecting factors have concentrated on the comparative analyses of experiment and the influence of phase structure, material properties, different heat treatment methods and loading methods, which is explained phenomenologically, is difficult to break through theoretically, cannot predict adiabatic shearing sensitivity with quantitative research
The chips cut by TA2 is almost continuous chip at lower speed (Fig. 5a, b), but Ti-6Al-4V produced obvious serrated chip spaced evenly by ASB, (Fig. 6a, b) at the same speed, just like the white arrows are pointing in Fig. 5e and Fig. 6d
Summary
The high-speed cutting has been the developing direction of machining technology. Factors that affect the localization of the adiabatic shearing are the material inherent nature, such as strength, thermal conductivity, density and specific heat capacity, and external factors, such as the cutting speed, the cutting thickness and the rake angle, etc. Adiabatic shearing sensitivity increases with the increase of materials strength, or the decrease of thermal conductivity for the material intrinsic characteristics.. The difference of thermal conductivity and strength is very big relative to density and specific heat capacity. Overview on the research development of ASB, the study of its formation mechanism and affecting factors have concentrated on the comparative analyses of experiment and the influence of phase structure, material properties, different heat treatment methods and loading methods, which is explained phenomenologically, is difficult to break through theoretically, cannot predict adiabatic shearing sensitivity with quantitative research.
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