Heterogeneous structure parameter effect upon resistance to contact spalling

et al. 2017

The investigations carried out deal with the re-gularity study in the distribution of shock pulse energy at multiple procedures of loading. The experimental researches were carried out on the specially developed test bench in which under all waveguides (or tools) of the shock system there were situated independently (separately) sensors connected with an oscilloscope registering parameters of a shock pulse (a form, amplitude, duration). As a result it was determined that the increase of the eccentricity in the symmetry axis location of a head and a waveguide (or a tool) and their number in the shock system contributes to the reduction of an energy portion sent to the deformation source. The application of multi-contact schemes of loading allows sending large total energy of a shock pulse to the deformation source to accept conditions of experiment fulfillment. At that the energy portion of a shock pulse fall-ing to each waveguide (or a tool) in the multicontact scheme as compared with the singlecontact one decreases (for rod-formed waveguides by 20%, and for spherical tools – by 15%) at the installation of each subsequent waveguide (or a tool) in the shock system.

Energetic Regularities of Pulse Loading by Systems With Intermediate Link

Яшин¹,

Yashin

et al. 2017

Strength Increase in Steel 45, 40h and 35hgsa by Deformation Wave Strengthening

Киричек¹,

Kirichek

et al. 2017

ПОВЫШЕНИЕ ПРОЧНОСТИ СТАЛЕЙ 45, 40Х И 35ХГСА УПРОЧНЕНИЕМ ВОЛНОЙ ДЕФОРМАЦИИПредставлены данные о влиянии упрочнения волной деформации на прочность сталей 45, 40Х и 35 ХГСА. Для повышения прочности данных ста-лей предлагается в их поверхностном слое волной деформации создавать структурированные гетеро-генно упрочненные области, состоящие из чере-дующихся твердых и вязкопластичных участков.Ключевые слова: волна деформации, твер-дость, гетерогенно упрочненная структура, проч-ность.A.V. Kirichek, S.V. Barinov, A.V. Yashin STRENGTH INCREASE IN STEEL 45, 40H AND 35HGSA BY DEFORMATION WAVE STRENGTHENINGStrength increase by a deformation wave is more advantageous in comparison with other ways of strengthening as it allows ensuring in a surface layer a larger depth of strengthening with a smooth transition from a strengthened surface to an non-strengthened one which is especially significant for materials operating under conditions of static loading. The paper reports the fulfilled investigations of the impact of strengthening heterogeneity with a deformation wave upon strength of steel 45, 40H, 35HGSA. The investigations of strength properties were carried out both on samples strengthened only on one side (on contact one), and on samples strengthened on two sides (on contact and supporting ones). As a result of investigations it is defined that at one-sided treatment of steel 45 with strengthening uniformity increase a strength limit increased by 8%, the ductility decreased by 37%, an elastic limit increased by 43%. The strengthening uniformity increase in steel 40H resulted in strength limit increase by 13%, elasticity decrease by 38% and elasticity limit increase by 81%. At steel 35HGSA strengthening with uniformity increase there was observed a strength limit increase by 4.2%, plasticity decrease by 28% and elasticity limit increase by 51%. In case of two-sided strengthening with a deformation wave the values of strength properties of steel 40H did not actually change in comparison with one-sided treatment. The two-sided strengthening of samples made of steel 35HGSA brought to the growth of their strength limit by 2.8% and ductility limit by 20% as compared with one-sided treatment.

Wave Deformation Multi-Contact Loading

Киричек¹,

Kirichek

et al. 2017

Представлены данные о влиянии числа, гео-метрии, расположения инструментов в многокон-тактной ударной системе на распределение микро-твердости в поверхностном слое. Эксперименталь-но установлена возможность многоконтактных ударных систем передавать в очаг деформации большую суммарную энергию ударного импульса. Показано, что производительность многоконтакт-ных ударных систем может быть повышена на 50%, без ухудшения параметров упрочнения, за счет увеличения расстояния между инструментами с плоским типом торца.Ключевые слова: ударный импульс, упроч-нение, волна деформации, микротвердость, волно-вод, боек, ударная система.