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Актуальные проблемы в машиностроении. 2016. №3
Материаловедение
в машиностроении
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363
THE INFLUENCE OF CYCLIC DEFORMATION ON THE BENDING STRENGTH
AND THE DUCTILITY OF LOW-ALLOY STEELS
Maksimov A. B.
, Ph.D. (Engineering), Associate Professor, e-mail:
aleksandrmks@yandex.ruGulyaev M. V.
, Ph.D. (Military), Associate Professor, e-mail:
aladin58@mail.ruErokhina I. S.
, Senior Lecturer, e-mail:
irina-kerchanka@yandex.ruKerch State Maritime Technological University, 82 Ordzhonikidze str., Kerch, 298309, Republic of
Crimea, Russian Federation
Abstract
In this paper we propose the explanation of the change of the impact toughness and elongation
during cold deformation of cyclic plastic bending of plate steel 10Г2С1. It is known that when the
cyclic strain curve the hardening is accompanied initially by a decrease in the viscosity and
plasticity of steel, then there is a partial recovery, and in total strain more than (30-40)% further
reduction. Under cyclic deformation by bending in the surface layer (thickness (1-1,5)
3
10
m.
wide beam there are residual compressive stress, and the tensile residual stresses. Compressive
stresses increase ductility and toughness of steel. Tensile stress – lower ductility and toughness. The
increase in the density of individual dislocations leads to decrease of ductility and toughness. Then
there is a cellular dislocation, which increases the viscosity and plasticity. The combination of the
factors of increasing and decreasing the ductility and toughness of the steel makes this change in
impact strength and elongation
Keywords
low alloy steel, cyclic bending, hardening, viscosity, elongation, wide beam.