ОПТИМИЗАЦИЯ И КОМПЬЮТЕРНОЕ ПРОЕКТИРОВАНИЕ ПРОЦЕССА ТЕРМОЦИКЛИЧЕСКОЙ ОБРАБОТКИ БЫСТРОРЕЖУЩЕЙ СТАЛИ Р18

The paper contains results pertaining to investigation of mechanical properties of P18 (18 % W) high-speed steel subjected to strengthening thermo-cycling heat treatment (STCHT). Optimization of temperature–time parameters of the STCHT process has been executed for impact strength, bending strength and surface hardness of the Р18 steel after thermo-cycling treatment. STCHT – process parameters – properties diagrams have been plotted using mathematical models. Treatment with optimum regime permits to increase wear resistance of a cutting tool made of Р18 steel by 1.5 to 6.3-fold in comparison with a conventionally treated tool.Приведены результаты исследования свойств быстрорежущей стали Р18 (18 % W), подвергнутой упрочняющей термоциклической обработке (УТЦО). Выполнена оптимизация температурно-временных параметров процесса УТЦО по ударной вязкости, прочности на изгиб и твердости термоциклически обработанной стали Р18. Используя математические модели, построены диаграммы «параметры УТЦО процесса – свойства». Обработка по оптимальному режиму позволяет увеличить износостойкость режущего инструмента из стали Р18 в 1,5–6,3 раза по сравнению с традиционно термообработанным

DEVELOPMENT OF CARBIDE AND NITRIDE CERAMICS OF INCREASED RESISTIBILITY

The developments of carbide and nitrite ceramics of high solidity are presented. It is shown that development of nanotechnology led to creation of thenanostructural ceramics, the composition of which is controlled on cluster level

INCREASE OF EROSIVE RESISTANCE AND VISCOSITY OF DESTRUCTION OF THE LAYERED MATERIALS RECEIVED BY EXPLOSION WELDING

It is offered to use the J-integral, which considers the plastic deformation at the crack tip, for layered materials based on high-strength steel Z8HN3MFA and erosion-resistant cobalt alloys EP131 or molybdenum alloy MT, which collapse under the laws of elastoplastic mechanics

REACTION FRITTING OF NANO-STRUCTURAL COVERINGS OF POW DER MATERIALS

Thin-film covers of silicon and carbon are received using the method of magnetron spraying of composite cathodes, the conditions of silicon carbide formation on diamond crystals are established

MODIFYING OF FOUNDRY STEELS BY NANOCOVERING OF STEEL SHOT

The technology of coatings deposition with thickness up to 5 micrometers on the activated surface of steel shot is developed. The composition and arrangements of layers in covering of the steel shot intended for modification of steel are chosen

PRODUCTION OF POROUS POWDER MATERIALS OF SPHERICAL POWDERS OF CORROSION-RESISTANT STEEL

Production of porous powder materials from spherical powders of corrosion-resistant steel 12Х18н10Т with formation at low pressures 120–140 mpa in the mold with the subsequent activated sintering became possible due to increase of duration of process of spattering and formation of condensate particles (Si–C) or (Mo–Si) on surface

CONDENSATE DEFORMATION AT FORMATION AND ACTIVATED AGGLOMERATION OF SPHERICAL POWDERS AT PRODUCTION OF POROUS MATERIALS

The variant of solution of the problem of porous powder materials production of spherical powders of corrosion-resistant steel with use of the complex technology combining development of nanotechnology, enabling to put on powder particles surfaces of condensate with thickness over 300 nanometers from layers of Si and mixture of elements (Si+C) or (Mo+Si) in the conditions of separate synthesis is offered

Features of phase transformations in system Cd-Ge-As

Установлены особенности фазообразования в системе Cd–Ge–As при синтезе монокристал- лов CdGeAs2. Показано, что при нагревании и охлаждении системы Cd–Ge–As в интервале температур 30–750 οС кристаллизация CdGeAs2 происходит с образованием метастабильной Cd3As2 фазы и промежуточной GeAs фазы. Установлено, что введение соединения Cd3As2 в исходную шихту стабилизирует состав жидкой фазы на фронте кристаллизации CdGeAs2 и устраняет образование метастабильной фазы Cd3As2 при получении однофазного соедине- ния CdGeAs2