The Paton Welding Journal, 2020, №11



2020 №11 (08)

DOI of Article 10.37434/tpwj2020.11.01

2020 №11 (02)

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The Paton Welding Journal, 2020, #11, 2-7 pages

Influence of composition of deposited metal and thermodeformation cycle of surfacing on stability of joints of wheel steels with dispersion nitride and solid solution strengthening to cold crack formation

V.D. Poznyakov, O.A. Gaivoronskiy, A.V. Klapatyuk, A.M. Denysenko and S.V. Shmygelskyi

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
Current trends in the development of railway transport increase the load on the axle and speed of freight trains. The relevant task is to create technologies for the production and restoration of railway wheels, which provide the extension of their service life in different operating conditions. To solve the specified problem, it is necessary to study the influence of different factors on the technological and operational strength of welded joints of wheel steels with dispersion nitride and solid solution strengthening and develop the technology for restoring the rolling profile of all-rolled wheels of freight cars. It was established that the change in resistance of the HAZ metal of wheel steels with dispersion nitride and solid solution strengthening to delayed fracture is significantly influenced by the carbon content in steel and cooling rate during welding. Diffusion hydrogen, contained in the deposited metal, getting into HAZ, significantly reduces its resistance to delayed fracture. In the new wheel steel, the carbon content should not exceed 0.55 %. Under other conditions, it will be impossible to provide the proper level of resistance of joints to the cold crack formation during surfacing of new railway wheels. 11 Ref., 3 Tables, 4 Figures.
Keywords: arc surfacing, wheel steel with dispersion nitride and solid solution strengthening, heat-affected-zone, structure, cooling rate, diffusion hydrogen, cold cracks

Received 02.11.2020

References

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