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2020 №09 (02) DOI of Article
2020 №09 (04)

Automatic Welding 2020 #09
Avtomaticheskaya Svarka (Automatic Welding), #9, 2020, pp. 28-35

Fatigue life of samples after wear-resistant, fabrication and repair surfacing

I.O. Ryabtsev1, V.V. Knysh1, A.A. Babinets1, S.O. Solovej1, V.M. Demenkov2
1E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
2State Company «State Scientifi c and Technical Center for Nuclear and Radiation Safety». 35-37 Vasyl-Stys Str., 03142, Kyiv, Ukraine. E-mail: vm_demenkov@sstc.com.ua

Cyclic fatigue life of specimens surfaced by fl ux-cored wire PP-Np-25Kh5FMS that provides deposited metal of the type of tool semiheat- resistant steel was studied. The design of the surfaced specimens and procedure of their testing simulated the operating conditions of mill rolls, for surfacing which fl ux-cored wire PP-Np-25Kh5FMS is widely used. Cyclic fatigue life of the specimens directly after surfacing was evaluated, as well as the eff ectiveness of application of repair surfacing to increase the residual cyclic fatigue life of specimens, in which preliminary testing revealed fatigue cracks in the deposited wear-resistant layer. The numerical method was used to determine the stress-strain state and calculate the stress intensity factor on the front of a nonthrough-thickness crotch corner fatigue crack that propagated in a specimen of 40Kh steel with a wear-resistant deposited layer at three-point zero-to-load cyclic loading. It is shown that the maximum values of the stress intensity factor along the crack front are located at approximately 1 mm distance from the vertical side face in the deepest point of the crack front and during fracture they reach the value of 52…64 MPa√m. During investigations it was shown that application of repair surfacing to products with fatigue cracks after their long-term service does not result in a signifi cant extension of their cyclic fatigue life after repair. This is related to the fact that after long-term service the defectfree layer of the deposited metal has a considerable level of accumulated fatigue damage. That is why performance of repair of the product region damaged by a fatigue crack, is not eff ective without complete removal of the deposited metal layer. Results obtained in this work will be further used as base ones during performance of comparative assessment of the impact of surfacing technique and technology, as well as surfacing materials, on the fatigue life of specimens. 17 Ref., 3 Tabl., 9 Fig.
Keywords: arc surfacing, manufacturing surfacing, repair surfacing, fatigue, fatigue life, fatigue cracks, stress intensity factor

Received: 24.07.2020


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