COLD WORK HARDENING EFFECT ON WEAR OF 0,2% C STEEL IN DRY SLIDING CONTACT AT HIGH CURRENT DENSITY
https://doi.org/10.17073/0368-0797-2015-6-434-438
Abstract
The current dependences of wear intensity and specific surface electric conductance of sliding electric contact 0,2 % C steel/0,45 % C steel are represented at contact current density higher than 100 A/cm2 without lubricant. It was shown that the steel having stronger cold work hardening realized has higher wear resistant than the low hardening steel. This fact is represented as a result of the realization of lower cycle stress amplitude in conditions of low cycled fatigue of the material adjoining to real contact spots of stronger hardened steel. It was marked that the contact characteristics of 0,2 % C steel are some higher than known contact characteristics of quenched steels. This is caused by higher plasticity reserve of 0,2 % C steel surface layer comparing with that of quenched steels. Structure changes of sliding surface were observed as a formation of friction induced structure layer containing crystal phases namely oxide FeO, α-Fe and γ-Fe. The optical image of worn surface having the signs of liquid phase appearance is shown. This phase is not a result of melting but it is a result of strong excited atoms appearance in thin surface layer.
Keywords
surface layer plasticity,
fatigue deterioration,
real contact spots,
friction,
wear intensity,
electric conductance of sliding contact
Supporting agencies: RFFI
About the Authors
M. I. Aleutdinova
Institute of Strength Physics and Materials Science SB RAS, Tomsk;
Seversk Technological Institute - branch of National Research Nuclear University
Russian Federation
Cand. Sci. (Eng.), Researcher
Russian Federation
Cand. Sci. (Eng.), Researcher
V. V. Fadin
Institute of Strength Physics and Materials Science SB RAS, Tomsk
Russian Federation
Cand. Sci. (Eng.), Assist. Professor, Senior Researcher
Russian Federation
Cand. Sci. (Eng.), Assist. Professor, Senior Researcher
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Review
For citations:
Aleutdinova M.I., Fadin V.V. COLD WORK HARDENING EFFECT ON WEAR OF 0,2% C STEEL IN DRY SLIDING CONTACT AT HIGH CURRENT DENSITY. Izvestiya. Ferrous Metallurgy. 2015;58(6):434-438. (In Russ.) https://doi.org/10.17073/0368-0797-2015-6-434-438
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