Avtomaticheskaya Svarka (Automatic Welding), #12, 2019, pp.4-11
Influence of thermal cycle of surfacing on mechanical properties and resistance to brittle fracture of haz metal of rail wheel steel M76
V.D. Poznyakov, O.A. Gaivoronsky, V.A. Kostin, O.M. Berdnikova, S.V. Shmigelsky
11 Kazymyr Malevich Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
Increasing the life of railway wheels is an urgent task. The solution to this problem is associated with the optimization of the structural state of metal of the railway wheels. In the work the influence of cooling rate during melting on mechanical properties, resistance to brittle fracture and structural changes of HAZ of wheel steel with carbonitride strengthening with a carbon content of 0.63% were investigated. It is shown that in the course of surfacing a hardening bainite-martensitic structure is formed, the volume fraction of the structural components in which is determined by the cooling rate. The hardened HAZ metal of wheel steel with carbonitride strengthening has a high strength and a low ductility and has a high tendency to brittle fracture. 12 Ref., 2 Tabl., 11 Fig.
Keywords: arc surfacing, carbonitride strengthening, heat-affected-zone, thermal cycle, brittle fracture
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