Study of Mode of Thermal Cycle Welding (Fps) Titanium Alloys in the Absence of Cavitation on the Properties of Welded Joints

Muravyev, Vasily I.; Bakhmatov, Pavel V.

doi:10.14489/hb.2017.03.pp.003-010

Cited by 1 publication

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“…In case of low friction speed, the adhesion acquires the character of seizure (microwelding) with a deficit of non-damaging stress relaxation processes, mainly realized by the mechanisms of relaxation and hysteresis internal friction [7,19]. Adhesion and gripping being topochemichal reactions of formation of metallic bonds in the solid phase at the interface, in these conditions act as leading mechanisms of the relaxation of contact stresses [3,20]. On the rigid elastic substrate, the protective films of secondary structures are unstable and rapidly degrade during friction, causing increased adhesive wear on the counterbody.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Processes of Substructural Rearrangement under Friction of Carbon Steel

Shevelya¹,

Pashechko²,

Kalda³

et al. 2023

Adv. Sci. Technol. Res. J.

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The effect of heat treatment (tempering temperature after quenching) of medium carbon steels (steel 45 and steel 50) on tribological indicators at sliding friction without lubrication in connection with the change in strength and rheological elastic properties of steel, controlling the dissipative properties of the frictional contact has been studied. Tribotechnical tests were conducted according to two schemes. A high-temperature tribometer was used for "soft" friction according to the "ball-plane" scheme, which allowed varying the temperature of the friction contact. Influence of load-rate modes was studied in more "hard" conditions on the friction machine under the "finger-disk" scheme. Substructural transformations of steel caused by heat treatment were evaluated by changes in amplitude-dependent internal friction on a torsion pendulum-type machine, which also allowed measuring frictional damping (contact internal friction) in the preliminary displacement mode. The interrelation between hardness, elastic modulus and internal friction of steel and wear resistance, wear capacity, friction coefficient and the level of frictional damping has been established. It is shown that the growth of elastic modulus and increase of steel relaxation resistance after the appropriate heat treatment are conjugated with the development of adhesion and setting, which, as topochemical reactions in the solid phase, are the leading forms of contact stress relaxation under the above conditions. Correlation of tribological indicators of external friction with amplitude-dependent and relaxation (temperature-dependent) internal friction taking into account structural state of steel and friction temperature regime is established. Substructural preconditions, dynamic relaxation mechanisms of hardening and load-temperature friction conditions under which martensitic structures exhibit abnormally high wear resistance and significant growth of frictional damping level are considered. The tribological analogue of the Porteuen -Le Chatelier effect, manifesting in the form of frictional self-oscillations in the range of temperatures of dynamic deformation aging is established. A treatment of the nature of the Kael-Ziebel effect, the temperature-rate and load localization of which in friction is associated with the temperature range of dynamic strain aging with Snook-Kester relaxation superimposed, is proposed.

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Section: Resultsmentioning

confidence: 99%