Effect of gas saturation of titanium alloys VT1-0, OT4-1, and VT-23 on their fatigue durability

Oxidation and gas saturation of titanium at high temperatures and, consequently, formation of gas-saturated layers may affect the mechanical properties of titanium alloys in different ways. The influence of the parameters of a gas-saturated layer (depth and increment of microhardness) on the cyclic durability of titanium alloys does not always fit a fixed 25% standard for the microhardness difference between the surface and the matrix of the metal. To evaluate the effect of gas saturation on the fatigue and strength properties of titanium alloys more exactly, we suggest a differentiated approach to estimating the influence of each parameter of the gas-saturated layer.Karpenko Physicomechanical Insitute, Ukrainian Academy of Sciences, L'viv. Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 29, No. 6, pp. 110–112, November–December, 1993.