2019 №04 (04) DOI of Article
2019 №04 (06)

Electrometallurgy Today 2019 #04
SEM, 2019, #4, 32-37 pages
Journal                    SEM
Publisher                International Association «Welding»
ISSN                      2415-8445 (print)
Issue                       № 4, 2019 (November)
Pages                      32-37

Impact of subsurface layers hardened by interstitial elements on titanium alloy mechanical properties

V.M. Fedirko, V.S. Trush, O.G. Lukianenko, I.M. Pogrelyuk
G.V. Karpenko Physico-Mechanical Institute of the NAS of Ukraine. 5 Naukova Str., 79060, Lviv, Ukraine. E-mail: pminasu@ipm.lviv.ua

In this work, subsurface gas-saturated layers 10 to 70 μm deep with different level of surface hardening were formed by diffusion saturation in a controlled gas medium on samples of commercial titanium alloys VT1-0, VT5, PT-7M, OT4-1. The possibility of improving the life characteristics of α- and pseudo-α titanium alloys under different kinds of loading (fatigue, long-term strength) under the conditions of regulated solid solution hardening of subsurface layers of metal by interstitial elements (O, N, C) is shown. Optimal parameters of modification of subsurface metal layer (hardness gradient and hardening depth) were determined, which provide maximum realization of this effect for each of the interstitial elements. Ref. 5, Tabl. 1, Fig. 9.
Key words: titanium alloys; subsurface layer; interstitial element; oxygen; nitrogen; carbon; static loading; fatigue life

Received:                26.07.18
Published:               23.09.19


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