Abstract
Methods of metallography, scanning electron, and transmission electron microscopies were used to study the structure of two pipe steels (without vanadium and with 0.03% vanadium) subjected to γ → α isothermal transformation at temperatures of 400–600°C (initial structure) and tempering at 600–650°C. It has been found that the addition of 0.03% vanadium intensifies the process of the precipitation of ferrite and contributes to the formation of a granular structure. It has been shown that, in high-strength pipe steels with 0.03% vanadium, which have bainitic granular-type structures, the effect of the precipitation strengthening is effected upon subsequent high-temperature tempering at 600–630°; the addition of vanadium leads to an increase in the hardness by 16 HV. In the presence of bainite of the lath type in the initial structure, the subsequent tempering leads to a softening associated with the processes of the recovery, polygonization, and initial stages of recrystallization in situ, which develops at temperatures above 640°C. It has been found that the hardness of the steel without vanadium upon additional tempering decreases regardless of the morphology of structural constituents in the initial structure.
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References
I. N. Golikov, M. I. Gol’dshtein, and I. I. Murzin, Vanadium in Steel (Metallurgiya, Moscow, 1968) [in Russian].
M. I. Gol’dshtein, A. V. Grin’, E. E. Blyum, and L. M. Panfilova, Strengthening of Structural Steels by Nitrides (Metallurgiya, Moscow, 1970) [in Russian].
I. I. Gorbachev, V. V. Popov, and A. Yu. Pasynkov, “Thermodynamic calculations of carbonitride formation in low-alloy low-carbon steels containing V, Nb, and Ti,” Phys. Met. Metallogr. 115, 69–76 (2014).
I. I. Gorbachev, A. Yu. Pasynkov, and V. V. Popov, “Prediction of the austenite-grain size of microalloyed steels based on the simulation of the evolution of carbonitride precipitates,” Phys. Met. Metallogr. 116, 1127–1134 (2015).
I. I. Gorbachev, V. V. Popov, and A. Yu. Pasynkov, “Simulation of precipitate ensemble evolution in steels with V and Nb,” Phys. Met. Metallogr. 116, 356–366 (2015).
R. J. Glodowski, “Vanadium microalloying in steel sheet, strip and plate products,” in Proc. Semin. “Using of Vanadium in Steel”, Ed. by L. A. Smirnov and P. S. Mitchell (Ural. Otd. Ros. Akad. Nauk, Ekaterinburg, 2002), pp. 183–210.
C. Zayats, “Phase separation and grain refinement in vanadium-containing steels,” in Proc. Semin. “Using of Vanadium in Steel”, Ed. by L. A. Smirnov and P. S. Mitchell (Ural. Otd. Ros. Akad. Nauk, Ekaterinburg, 2002), pp. 224–258.
B. Z. Belen’kii, “Vanadium-containing steels of enhanced strength for flat rolled products,” Proc. Semin. “Using of Vanadium in Steel”, Ed. by L. A. Smirnov and P. S. Mitchell (Ural. Otd. Ros. Akad. Nauk, Ekaterinburg, 2002), pp. 165–182.
V. M. Schastlivtsev, T. I. Tabatchikova, I. L. Yakovleva, S. Yu. Klyueva, A. A. Kruglova, E. I. Khlusova, and V. V. Orlov, “Effect of austenite-decomposition temperature on bainite morphology and properties of lowcarbon steel after thermomechanical treatment,” Phys. Met. Metallogr. 114, 419–429 (2013).
M. Yu. Matrosov, O. P. Talanov, I. V. Lyasotskii, and A. A. Kichkina, “Change of structure and mechanical properties of thick-sheet ferrite-bainite high-strength pipe steel under the action of heat treatment,” Metalloved. Term. Obrab. Met., No. 5, 19–24 (2011).
S. A. Golosienko, G. D. Motovilina, E. I. Khlusova, and E. A. Yashina, Structure and properties of steel of a strength class K70 after quenching from the rolling temperature, Vopr. Materialovedeniya, No. 4 (68), 36–44 (2011).
O. V. Sych, V. V. Orlov, A. A. Kruglova, and E. I. Khlusova, “Changes in the structure of highstrength pipe steel of the strength class K70–K80 depending on the regimes of high-temperature tempering after thermomechanical treatment,” Vopr. Materialoved., No. 1 (65), 89–99 (2011).
V. M. Schastlivtsev, T. I. Tabatchikova, I. L. Yakovleva, S. Yu. Klyueva, A. A. Kruglova, E. I. Khlusova, and V. V. Orlov, “Microstructure and properties of low-carbon weld steel after thermomechanical strengthening,” Phys. Met. Metallogr. 113, 480–488 (2012).
DIN 50150-2000 “Testing of metallic materials. Conversion of hardness values”.
G. V. Kurdyumov, L. M. Utevskii, and R. I. Entin, Transformations in Iron and Steel (Nauka, Moscow, 1977) [in Russian].
M. V. Belous, V. T. Cherepin, and M. A. Vasil’ev, Transformations upon Steel Tempering (Metallurgiya, Moscow, 1973) [in Russian].
V. M. Schastlivtsev, T. I. Tabatchikova, I. L. Yakovleva, S. Yu. Del’gado Reina, S. A. Golosienko, U. A. Pazilova, and E. I. Khlusova, “Effect of thermomechanical treatment on the resistance of low-carbon low-alloy steel to brittle fracture,” Phys. Met. Metallogr. 116, 189–199 (2015).
I. I. Novikov, Theory of Heat Treatment of Metals (Metallurgiya, Moscow, 1986) [in Russian].
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Original Russian Text © O.V. Sych, A.A. Kruglova, V.M. Schastlivtsev, T.I. Tabatchikova, I.L. Yakovleva, 2016, published in Fizika Metallov i Metallovedenie, 2016, Vol. 117, No. 12, pp. 1321–1331.
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Sych, O.V., Kruglova, A.A., Schastlivtsev, V.M. et al. Effect of vanadium on the precipitation strengthening upon tempering of a high-strength pipe steel with different initial structure. Phys. Metals Metallogr. 117, 1270–1280 (2016). https://doi.org/10.1134/S0031918X16120152
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DOI: https://doi.org/10.1134/S0031918X16120152