Improvement of the fatigue characteristics of VT1-0 titanium alloy by the surface mechanical and rapid thermal treatment

Microstructure and mechanical properties of commercial-purity titanium after rapid (induction) heat treatment

“…The observed improvement in fatigue properties is very attractive and is similar to results obtained using special surface mechanical-hardening treatments employed in study of Markovsky et al (2006). In other, former, work, high tensile strength (∼1050 MPa) and fatigue endurance limit (∼420 MPa) were obtained in CP-Ti via a refinement of the microstructure (␣-grain diameter ∼0.15 m) using severe plastic deformation as it was reported by Vinogradov and Hashimoto (2003) and Kim et al (2006).…”

“…16. The fatigue limit measured for material with the initial condition (250 MPa) is typical for CP-Ti (Markovsky et al, 2006;Kim et al, 2006). By contrast, the endurance limit for the LRHT material was ∼40% higher.…”

Enhanced fatigue behavior of powder metallurgy Ti–6Al–4V alloy by applying ultrasonic impact treatment

“…The curvature radius (R¼20 mm) of the pin surface is close but slightly lower than that of the gauge section of the treated specimen. The induced frequency of impacts f I in this loading scheme was about 3 kHz [27][28][29][30]. It is of importance that high transversal constituent of load was applied to the treated surface of specimen.…”

“…Experimental investigations of the fatigue behavior were performed using a rotary bending machine (Model: M1) [18,27]. Stress controlled rotary bending fatigue tests were carried out at ambient temperature air at a cyclic frequency of 50 Hz.…”

A novel proposal to manipulate the properties of titanium parts by laser surface alloying

“…Surface treatments such as shot peening [9] and laser peening [10] are designed specifically to increase fatigue strength by producing residual compressive stresses [11], which increase the resistance to crack nucleation, thereby increasing fatigue life. However, such surface treatments are usually counterproductive to the enhancement of osseointegration and biocompatibility.…”