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Actual Problems in Machine Building. Vol. 4. N 1. 2017
Materials Science
in Machine Building
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104
17.
Канн Р.У., Хаазен П.Т.
Физическое металловедение. Т. 3: пер. с англ. – М.:
Металлургия, 1987. – 330 с.
18.
Бернштейн М.Л.
Структура деформированных металлов. – М.: Металлургия, 1977.
– 431 с.
THE EFFECT OF PRELIMINARY SCHEME OF DEFORMATION
ON THE TOUGHNESS OF LOW ALLOY STEEL
Maksimov A.B
., Ph.D. (Engineering), Associate Professor, e-mail:
aleksandrmks@yandex.ruYerohina 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
The influence of the scheme of pre-strain on cyclic bending on the value of impact strength low
alloy steel 09Г2 when tested for impact strength. It is established that, if the bending pre-strain
occurs in the same plane as the bending test impact strength, the decrease in toughness more than if
these planes would be perpendicular. This difference is explained by the conditions of initiation and
propagation of cracks in both cases. If the plane of bending coincide when pre-deformation and
when tested for impact strength, the origin and development of cracks occurs in areas of tension and
then occurs in the region of compression. With mutually perpendicular arrangement of these planes
is the front for the initiation and propagation of cracks occurs in the compressed and stretched
regions. When pre-deformation cyclic bending in the surface layers of the specimen having
compressive stress, and in the Central and intermediate regions of tensile stress. Depending on what
field will emerge and spread crack when testing the impact strength will depend on the magnitude
of toughness.
Keywords
residual voltage, low alloy steel, plastic bending, impact strength, degree of a single strain, the
number of bending cycles, the scheme of deformation