Low-cycle fatigue of titanium alloys

1972 ◽  
Vol 14 (4) ◽  
pp. 343-344
Author(s):  
V. I. Tseitlin ◽  
G. A. Gromov ◽  
A. N. Kryuchkova
Keyword(s):  
Titanium Alloys ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue

Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412

2021 ◽  
Author(s):  
◽  
William Davey
Keyword(s):  
Crack Initiation ◽  
Titanium Alloys ◽  
Low Cycle Fatigue ◽  
Fatigue Crack Initiation ◽  
Charpy Impact ◽  
Fatigue Behaviour ◽  
High Energy ◽  
Process Window ◽  
Cycle Fatigue ◽  
The Impact

TIMETAL®407 (Ti-407) is a medium strength (~650MPa 0.2%YS) titanium alloy, recently developed by TIMET, in conjunction with Rolls-Royce plc for use in applications requiring high energy absorption at impact. Preliminary Charpy Impact (V notch) testing showed Ti-407 to absorb nearly twice the impact energy of Ti-6-4 and exhibit more than 2.5 times the lateral expansion. Further initial testing suggested the high cycle fatigue (HCF) run out stress of Ti-407 matches that of Ti-6-4 and other high strength alpha-beta titanium alloys. Ti-407 displayed more than double the tool life than that of Ti-6-4. The reduction in tool wear supports lower forces required for faster, more efficient machining. Compared to Ti-6-4, the relatively low elevated temperature flow stress, greater malleability and wide process window should allow Ti-407 to be processed with fewer reheats, while exhibiting reduced surface cracking and giving a consistently good surface finish. Optimised Ti-407 manufacturing processes should allow parts to be formed closer to net shape giving higher yields and requiring less machining to the components finished size. This project has evaluated HCF, as well as low cycle fatigue (LCF) and dwell fatigue crack initiation mechanisms in Ti-407, to clarify the effects of alloy chemistry, microstructural morphology and scale, and crystallographic texture. A derivative of Ti-407, Ti-412 (~750MPa 0.2%YS) was also tested towards the end of the project and helped to further elucidate understanding of the fatigue characteristics of the two alloys. Of interest was the strong HCF response displayed relative to the monotonic tensile strength. As well as the investigation into the crack initiation mechanisms, an assessment of crack propagation across a range of microstructural conditions was carried out on Ti-407 material.

Effect of PVD coatings on the strain and low-cycle fatigue resistance of stainless steel and titanium alloys

2011 ◽  
Vol 43 (6) ◽  
pp. 604-614 ◽  
Author(s):  
A. P. Gopkalo ◽  
N. R. Muzyka ◽  
A. V. Rutkovskii ◽  
V. P. Shvets
Keyword(s):  
Stainless Steel ◽  
Titanium Alloys ◽  
Fatigue Resistance ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Pvd Coatings

scholarly journals Low-cycle fatigue of welded structures made from domestic and imported materials

2019 ◽  
Vol 80 (4) ◽  
pp. 75-79
Author(s):  
M. A. Vasechkin ◽  
S. V. Egorov ◽  
A. B. Kolomensky ◽  
E. D. Chertov
Keyword(s):  
Titanium Alloys ◽  
Welded Joints ◽  
Low Cycle Fatigue ◽  
Testing Machine ◽  
Simultaneous Action ◽  
Asymmetry Factor ◽  
External Loading ◽  
Cycle Fatigue ◽  
Corrosion Resistant ◽  
Stress Concentrators

In various branches of modern engineering, corrosion-resistant steels and titanium alloys are widely used as structural materials. At the same time, it is possible to connect parts made from domestic and imported alloys using automatic argon-arc electric welding, which leads to the formation of a material with unexplored properties in the weld. Welded joints are stress concentrators and currently there is no information about low-cycle fatigue of welded joints obtained by fusing domestic and imported materials. In the course of the research, the modes of welding and heat treatment of butt welded joints obtained from sheet titanium alloys and corrosion-resistant steel of domestic and foreign production have been developed. Resource tests for low-cycle fatigue of samples of welded joints were carried out. Tests on low-cycle fatigue were carried out on the upgraded testing machine UMM-10 with repeated static stretching with an asymmetry factor of +0.1 and at a frequency of 0.6–0.8 Hz. The maximum tensile stress was 80% of the temporary tensile strength of the weakest alloy in the pair. The main stress axis from external loading in all cases was perpendicular to the weld. The tests were carried out until the destruction of the sample. As a result of research, it was established that all welded joints were destroyed along the fusion line, which is explained by the simultaneous action of geometric and structural stress concentrators. In this case, the destruction of the samples, as a rule, began near the seam from the side of the weakest alloy in the pair. It was also established that the use of temperatures of incomplete annealing in comparison with the full one allows to increase the cyclic durability for welded joints of titanium alloys by 1.3–2 times. From the results of comparative tests of samples of corrosion-resistant steels, it follows that domestic and imported steels, as well as their welded joints, have similar properties, both in strength and in re-static durability.

Low-cycle fatigue of VT3-1 and VT22 titanium alloys in repeated tension

1979 ◽  
Vol 11 (6) ◽  
pp. 568-571 ◽  
Author(s):  
Yu. A. Eremin ◽  
Ya. M. Klebanov ◽  
V. E. Matveev ◽  
M. I. Timofeev
Keyword(s):  
Titanium Alloys ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue
Sign in / Sign up

Export Citation Format

Share Document