Avtomaticheskaya Svarka (Automatic Welding), #3, 2021, pp. 3-9
Fatigue life of steel specimens 40KH after wear-resistant surfacing with a sublayer of low-carbon steel
І.О. Ryabtsev, V.V. Knysh, A.A. Babinets, S.O. Solovej
E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
The resistance to fatigue fracture of steel 40Kh after wear-resistant surfacing using PP-NP-25Kh5FMS flux-cored wire with a sublayer
of a low-carbon plastic material formed by Sv-08A wire was investigated. The design of the deposited specimens and the procedure of
their testing simulated the operating conditions of the mill rolls, for the surfacing of which PP-NP-25Kh5FMS flux-cored wire is widely
used. A comprehensive procedure for evaluating the resistance of multilayer material to fatigue fracture included three stages: establishment
of cyclic life of specimens after manufacturing surfacing; study of cyclic crack resistance of different metal layers; determination
of fatigue life of specimens, which in the course of preliminary tests had fatigue cracks in the deposited layer after repair surfacing. It
was established that the cyclic life of the specimens of carbon steel 40Kh, deposited using PP-NP-25Kh5FMS flux-cored wire with
a sublayer of low-carbon steel 08kp (rimmed) exceeds the cyclic life of the specimens deposited without a sublayer, approximately
by 2 times. The maximum values o f SIF (140…180 MPa√m
) obtained on the specimens with a multilayer surfacing with a sublayer,
are 2… 3 times higher than the maximum values of SIF obtained on the specimens without a sublayer, which indicates the feasibility
of using a low-carbon sublayer to increase the crack resistance of a multilayer material with wear-resistant surfacing. It was shown
that performance of repair surfacing according to the scheme of removal and a subsequent surfacing of only areas of the metal with
fatigue cracks of long-term operating parts does not lead to a significant increase in the cyclic life after repair. This is related to the fact
that after long operation, the defect-free layer of deposited metal has a significant level of accumulated fatigue damages. Therefore,
to increase the efficiency of repair surfacing, it is recommended to remove not only the metal around the detected fatigue cracks, but
the entire deposited layer to the depth of detected fatigue cracks with the subsequent restoration surfacing. 18 Ref., 4 Tabl., 7 Fig.
arc surfacing, repair surfacing, plastic sublayer, fatigue life, fatigue cracks, stress intensity factor
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