REGULARITIES OF SHORT-TERM CREEP OF St3 STEEL
https://doi.org/10.17073/0368-0797-2015-11-798-802
Abstract
The behavior of building steel of the grade St3 was investigated in conditions of short-term heatings in a range of temperatures 450 – 650 °С and a short-term resource (up to 2 hours) in the area of initial stress not above a yield strength. It was revealed, that in these conditions initial ferrite + pearlite structure of steel has suffi cient stability and recrystallization is not observed. It is shown, that at test temperature of 450 °С and levels of stress ~ 0,8 from a yield strength at 20 °С time before fracture can make from hours up to days for the steel St3. The fracture more than 0,8 at levels of stress at temperature of 650 °С starts in several minutes. The calculated energy of activation of 310,8 – 387,8 kJ/mole of the creep processes of St3 steel can be correlated to the activation energy of α-iron self-diff usion.
Keywords
About the Authors
M. Yu. Belomyttsev
National University of Science and Technology “MISIS” (MISIS) (4, Leninskii ave., Moscow, 119049, Russia)
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Professor of the Chair Metallography and Physics of Strength
S. V. Mordashov
State Fire Academy of Emercom of Russia (4, Borisa Galushkina str., Moscow, 4129366, Russia)
Russian Federation
Researcher
Russian Federation
Researcher
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Review
For citations:
Belomyttsev M.Yu., Mordashov S.V. REGULARITIES OF SHORT-TERM CREEP OF St3 STEEL. Izvestiya. Ferrous Metallurgy. 2015;58(11):798-802. (In Russ.) https://doi.org/10.17073/0368-0797-2015-11-798-802
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