рефераты конспекты курсовые дипломные лекции шпоры
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Реферат Курсовая Конспект
Conclusions
Conclusions - раздел Образование, Об’єкт дослідження – порошкові карбідосталі що виготовлені з сумішей єлементарних порошків On The Basis Of Generalization Of Results Of Analysis Of Modern Progress Of M...
On the basis of generalization of results of analysis of modern progress of materials science of powder wearproof and construction materials, experimental and analytical researches of processes of gelation of materials and formreception of details, trends theoretical bases and experimental ground of the complex going are developed near creation of technological processes of receipt of row of new powder composition materials on the basis of iron for work in the conditions of the enhanceable loadings and intensive wearing away actions, and also effective wasteless technologies of making from them of wares with the purpose of providing of the set complex of properties.
At the choice of alloying chart for the receipt of the economy alloyed powder material efficiency of application of the coniferous forest was grounded as basic alloying an element for making of wearproof powder compositions on the basis of alloys of iron which is stipulated quite a few him unique properties.
The new effective technological process of receipt of highlytight compos of the system is developed a carbide of titan is steel with application of method of the hot punching of the sintered purveyances. Basic conformities to the law of forming of structure are investigational at all stages technological-process. An analysis of results of DTA of mixture is high-speed steel - the carbide of titan rotined that appearance of liquid phase at sintering appeared already at the temperature of 1130 - 1140 0C as a result of diffusion of carbon from grains of TiC1-x, which contact with steel. It is set that hot flowage of powder pseudoalloy high-speed steel - the carbide of titan promotes together with the compression of material, also, activating of alloyreception. The high-quality estimation of distributing of elements rotined between a matrix and particles of carbide of titan, that in carbidoseel, got sintering in presence a liquid phase, grains of TіC are enriched vanadium, tungsten and molybdenum, with the distinctly expressed circular structure on the limits of grain. In case the use of technology of the hot punching, the concentration of elements is largely evened, as a result there is substantially more even distributing of alloying elements on the field of microsection.
Researches of basic physic-mechanical properties of carbidoseels, made on different technological variants (liquidstate sintering, hot pressing, is in graphite forms, hot punching of porous purveyances), rotined that application of the hot punching of the sintered purveyances resulted in the increase of durability of material on a bend and shock viscidity as compared to materials, got liquidstate sintering or hot static pressing, at a maintainance enough high values of hardness.
On the basis of the use of effect of formation of low-melting eutecticum in the system Fe – Ti was offered new technological going near the receipt of compos of the system a carbide (boride) of titan is steel, which consists in providing of forming the carbidic constituent of pseudoalloy as a result of exothermic reaction at sintering of powder mixtures, which consist of powders of titan, alloy, on the basis of iron and carbon. The microstructures of alloys, mixtures counted on forming of different stoichiometrical values of TiCx got at reactionary sintering, are characterized the evenly up-diffused on volume carbidic grains, surrounded layers of metallic copula.
The mechanism of alloyreception is studied in the process of reactionary sintering of powder mixtures of Fe-Ti–C. It is rotined, that regulating the temperature of autowarm composition by the change of composition of charge, it is possible to manage growths of carbidic grains; with diminishing of maintenance of carbon in initial mixture and, accordingly, degree of stoichiometry of the got carbide of titan, the size of grains of carbidic phase diminishes notedly.
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Об’єкт дослідження – порошкові карбідосталі що виготовлені з сумішей єлементарних порошків
Пояснювальна записка книга стор рис табл джерел... Об єкт дослідження порошкові карбідосталі що виготовлені з сумішей... Мета роботи дослідження структуроутворення в процесі реакційного спікання та гарячого деформування порошкових...
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