To study the influence of hydrogenation on deformation and cutting mechanism of TA15 alloy

tensile test and cutting experiment with different hydrogen content are performed to obtain the mechanical properties

cutting force and the differences in microstructure characteristics of serrated chip. The results show that the yield strength ratio decreases

the plasticity enhances with high hydrogen content and its working hardening is serious. Hydrogen promotes the thermal softening effect

and the higher hydrogen content

the lower critical cutting speed which causes the decrease of cutting force. The difference of plastic deformation characteristics in different regions can be observed in the serrated chip of the as-received and low-hydrogenated groups

the uniform plastic deformation exists in the serrated unit

and the local severe plastic deformation exists in the shear band

which verifies the occurrence of adiabatic shear. However

the microstructure with high hydrogen content has high consistency without local severe plastic deformation. The serrated chip morphology shows the feature of decreasing serration

so it can be inferred that the hydrogen improves the plasticity of the alloy and inhibits the local severe plastic deformation

which significantly improves the cutting performance of TA15 alloy.