TPWJ, 2020, #9, 19-25 pages
Fatigue life of specimens after wear-resistant, manufacturing and repair surfacing
I.O. Ryabtsev1, V.V. Knysh1, A.A. Babinets1, S.O. Solovej1 and V.M. Demenkov2
E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: firstname.lastname@example.org
State Company «State Scientific and Technical Center for Nuclear and Radiation Safety»
35−37 Vasyl Stus Str., 03142, Kyiv, Ukraine. E-mail: email@example.com
Cyclic fatigue life of specimens surfaced by flux-cored wire PP-Np-25Kh5FMS that provides a deposited metal of the
type of tool semi-heat-resistant steel was studied. Design of the deposited specimens and procedure of their testing simulated
the operating conditions of mill rolls, for surfacing of which flux-cored wire PP-Np-25Kh5FMS is widely used.
Cyclic fatigue life of the specimens directly after surfacing, as well as the effectiveness of application of repair surfacing
were evaluated to increase the residual cyclic fatigue life of the 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 corner fatigue crack that propagated in a specimen
of 40Kh steel with a wear-resistant deposited layer at a 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 the products with fatigue cracks after their
long-term service does not result in a significant extension of their cyclic fatigue life after repair. This is related to the
fact that after long-term service the defect-free layer of the deposited metal has a considerable level of accumulated
fatigue damages. That is why performance of repair of the product region damaged by a fatigue crack, is not effective
without a complete removal of the deposited metal layer. The 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 Tables, 9 Figures.
arc surfacing, manufacturing surfacing, repair surfacing, fatigue, fatigue life, fatigue cracks, stress
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