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2021 №08 (09) DOI of Article
10.37434/as2021.08.01
2021 №08 (02)

Automatic Welding 2021 #08
Avtomaticheskaya Svarka (Automatic Welding), #8, 2021, pp. 3-8

Fatigue life of specimens from 40KH steel after wear-resistant surfacing with a low-alloy steel sublayer

V.V. Knysh, S.O. Solovej, I.O. Ryabtsev, A.A. Babinets
E.O. Paton Electric Welding Institute. 11 Kazymyr Malevych Str., 03150 Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Studied was the fatigue fracture resistance of a multilayer maetrial, in which the wear-resistant layer was deposited with PP-Np-25Kh5FMS flux-cored wire with a sublayer from a low-alloy material, deposited with PP-Np-12Kh1MF wire. The surfaced specimens design and their testing procedure simulated the operating conditions of steel mill rolls. The integrated procedure of evaluation of fatigue fracture resistance of multilayer surfaced specimens included three stages: determination of cyclic fatigue life of the specimens after fabrication surfacing; studying the cyclic crack resistance of different deposited layers; determination of fatigue life of specimens, having fatigue cracks in the deposited layer during previous testing, after their repair surfacing. It is found that the cyclic fatigue life of specimens from 40Kh carbon steel, surfaced with PP-Np-25Kh5FMS flux-cored wire with a sublayer of 12Kh1MF low-alloy steel is in the range of 346…716 thous. cycles at maximum stress level of 500 MPa. Features of fatigue fracture kinetics of the studied multilayer material were determined. It was established that the fatigue crack propagates in an unstable manner in the deposited metal (in the wear-resistant layer and low-alloy steel sublayer), constantly changing its rate and direction. It is shown that cutting out fatigue cracks and subsequent surfacing of their removal areas allows restoring the cyclic fatigue life of the specimen to the initial level, i.e. doubling the total life. 16R ef., 4 Tabl., 7 Fig.
Keywords: arc surfacing, repair surfacing, sublayer, fatigue life, fatigue crack, stress intensity factor.


Received: 09.06.2021

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