Fatigue Limit of Two-Phase Titanium Alloy after Surface Deformation-Diffusion Treatment

The fatigue behavior during rotating bending of two-phase titanium alloy (Ti-5Al-5Mo-5 V-Cr-Fe) hardened by deformation (ball burnishing), diffusion (gas nitriding) treatments, and their combination (so-called deformation-diffusion treatment) was investigated. It was shown that combined deformation-diffusion treatment provides a 15% increase in the fatigue limit of titanium alloy compared to gas nitriding without the pre-ball burnishing. After SEM, durometric and fractographic analyses the features of fatigue fracture of titanium alloy hardened by various methods of surface engineering were studied. In the research, an attempt was made to explain the reasons for the highest fatigue characteristics of titanium alloy after deformation-diffusion treatment compared to gas nitriding and ball burnishing.

Automated summary

The fatigue behavior of a two-phase titanium alloy (Ti-5Al-5Mo-5 V-Cr-Fe) was investigated under rotating bending conditions. The alloy was hardened through deformation (ball burnishing), diffusion (gas nitriding), and their combination (deformation-diffusion treatment). The research found that the combination treatment resulted in a 15% increase in fatigue limit compared to gas nitriding alone. The study also analyzed the fatigue fracture features of the alloy after different surface engineering methods and attempted to explain the superior fatigue characteristics of the deformation-diffusion treatment compared to gas nitriding and ball burnishing.