TPWJ, 2020, #5, 2-8 pages
Structure and crack resistance of special steels with 0.25−0.31 % carbon under the conditions of simulation of thermal cycles of welding
O.M. Berdnikova, V.A. Kostin, V.D. Poznyakov, O.A. Gaivoronskii, T.O. Alekseenko and I.I. Alekseenko
E.O. Paton Electric Welding Institute of the NAS of Ukraine
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: firstname.lastname@example.org
The impact of thermodeformational cycle of welding on structural-phase transformations in the HAZ metal of armour
steel of 30Kh2NMF type with different carbon content (0.25; 0.29 and 0.31 %) was studied. At the next stage, structural
changes in model samples–simulators with 0.31 % carbon at different cooling rates (3.8; 12.5 and 21 °C/s) and their
fracture mode after bend testing were studied. As a result of the performed studies, it was established that the structure
ensuring the optimum level of strength and fracture toughness, forms when low cooling rates are used (below 3.8 °C/s).
13 Ref., 3 Tables, 6 Figures.
special high-strength steel, thermodeformational welding cycle, thermokinetic transformation diagrams,
heat-affected zone, microstructure, fracture mode, crack resistance
1. Otroshchenko, B. (2005) Let armour become stronger and
tanks be improved. Metall Bulleten, Ukraine, 10 [in Russian].
2. Kashirsky, Yu.V. (2000) Information bank on mechanical engineering
materials and modes of treatment. Tyazholoe Mashinostroenie,
4, 12–19 [in Russian].
3. Goldshtejn, M.I., Grachev, S.V., Veksler, Yu.G. (1985) Special
steels. Moscow, Metallurgiya [in Russian].
4. Kuchuk-Yatsenko, S.I., Grigorenko, G.M., Novikova, D.P et
al. (2007) Effect of energy input on ductile properties of flash
butt welded joints in steel X70. The Paton Welding J., 6, 2–6.
5. Gulyaev, A.P. (1960) Heat treatment of steel. Moscow, Mashgiz
6. Seo, J.S., Kim, H.J., Ryoo, H.S. (2008) Microstructure parameter
controlling weld metal cold cracking. J. of Achievements
in Materials and Manufacturing Eng., 27, 199–202.
7. Sterenbogen, Yu.A. (1986) Some factors determining resistance
of HAZ metal of martensitic steels to cold crack formation.
Avtomatich. Svarka, 6, 5–8 [in Russian].
8. Skulsky, V.Yu. (2009) Peculiarities of kinetics of delayed
fracture of welded joints of hardening steels. The Paton Welding
J., 7, 12–17.
9. Gajvoronsky, A.A., Sarzhevsky, V.A., Gordonny, V.G. (1997)
Weldability of medium-carbon alloyed steel 38Kh2MYuA.
Avtomatich. Svarka, 4, 20–24 [in Russian].
10. Kostin, V.A., Grigorenko, G.M., Poznyakov, V.D. (2019) Peculiarities
of HAZ metal structure formation of welded joints
of foreign special steels. Svarochn. Proizvodstvo, 12, 50–56
11. Grigorenko, G.M., Kostin, V.A., Orlovsky, V.Yu. (2008) Current
capabilities of simulation of austenite transformations in
low-alloyed steel welds. The Paton Welding J., 3, 22–24.
12. Cherepin, V.T. (1968) Experimental technique in physical materials
science. Kiev, Tekhnika [in Russian].
13. Krimer, B.I., Panchenko, E.V., Shishko, L.A. et al. (1966)
Laboratory practical work on metallography and physical
properties of metals and alloys. Moscow, Metallurgiya [in
Advertising in this issue: