High level forming of properties in steel products

Kinds of defects are considered typical for steel from continuous casting machines. Negative influence of the central porosity and liquation strips on plasticity and impact strength of steel is shown. Decisions are offered at technological restructuring of rolling providing steel plasticity increase and durability of details from steel 40H. © IDOSI Publications, 2013

Development of combined technologies and multifunctional equipment for application of polymer powder coatings

© 2016 Research India Publications.New processes and a complex of specialized equipment, which allow applying polymer powder coatings onto the surface of materials of various nature in stationary and non-stationary conditions by using combined methods, were developed. Mathematical model of the processes of heating and melting of particles of powder compositions, which provides a perfect homogeneity of solid surfaces with guaranteed quality, was proposed. Operating and design parameters of technological processes and equipment were optimized

Process of predicting the hardness of welded joints detail

The possibility of predicting the mechanical properties of welded joints of metal materials at the weld hardness example. Identified according to the quality of the images on the results of the parameterization of microstructures. The nature of the influence of defects of welded joints on the parameters of order and uniformity of structure. A probabilistic prediction algorithm based on the mechanical properties of the structure and characteristics of the calculation by calculating the temperature change during welding. The study conducted adaptation of the method of parameterization of microstructures applied to welded joints of austenitic steels, to establish the relationship between the conditions of preparation, structural defects and the results of parameterization

The study of hardness of welded joints of parts in the automotive industry

© Research India Publications.The possibility of predicting the mechanical properties of welded joints of metal materials at the weld hardness example. Identified according to the quality of the images on the results of the parameterization of microstructures. The nature of the influence of defects of welded joints on the parameters of order and uniformity of structure. A probabilistic prediction algorithm based on the mechanical properties of the structure and characteristics of the calculation by calculating the temperature change during welding. The study conducted adaptation of the method of parameterization of microstructures applied to welded joints of austenitic steels, to establish the relationship between the conditions of preparation, structural defects and the results of parameterization

Temperature change calculation at welding products

Thermal calculation of the welded seams was conducted, made from heat resisting austenitic steel 10X11H20T2P by argon-arc welding. Schedules of temperature increment are constructed during various time moments on mode parameters existing on technology manufacture and on offered welding conditions. Structure forecasting opportunity and mechanical properties of welded connection various zones is shown: a welded seam, weld lines, zones of thermal influence and basic metal by calculation of temperature field changing in time. Calculation data are received at use of standard methods of calculation and under general formulas. Basic methods of experimental temperature test are considered at welding and computer application in calculations of temperature fields. Recommendations are given at the welding modes choice for prevention of hot cracks formation, namely, welding speed reduction up to 6 km/h is recommended. © IDOSI Publications, 2014

Prediction of the structural state of powder steels by multifractal parameterization

The paper analyzes the current state of technology of powder steels and potential use in its objectives methodology of multifractal parameterization. The objects of study were samples microstructure of carbon steels. Tasks in the study necessitated the use of standard methods for determining the mechanical properties of the metal, the method of multifractal parameterization, metallographic examinations and standard methods of statistical processing of the results. The influence of the conditions for obtaining images of the microstructure (magnification, the type of etchant, plane grinding) on multifractal parameters uniformity and order was studied. The conditions for image acquisition, excluding distortions of multifractal parameters were found. It was found that the use of multifractal parameterization provides increased strength characteristics of up to 8-10% and significantly (up to 40%) to reduce the cost of optimization by reducing the number of experimental studies

Microalloy steels: Energy saving prospect at manufacture of details of cars

Complex researches of mechanical and processing behavior of ATs40H2NMAF and ATs30H3NMAFB microalloy steels are conducted. Possibility of realization of forging heat for heat treatment of forgings is shown. Use such staly for manufacture the heavyduty of details - elbowed shaft and rods of the engine is recommended

Light-Reflecting coatings on the basis of polymeric powder compositions and micro spheric reflectors

Tailored compositions and the structure of light-reflecting coatings with the use of thermosetting polymeric powder compositions and micro-spheric reflectors on the basis of inorganic glass are developed. In order to get light-reflecting coatings with the preset complex of optical and physical-chemical figures we developed technological process. The technological process of powder compositions application and coating formation is carried out with the help of the specialized equipment complex. We defined the basic optical properties of the coatings and optimum operating parameters of their derivation. We developed optico-physical model of multilayer filled coating structure considering the optical and other characteristics of the components which form the coating. © IDOSI Publications, 2014

Innovative decisions at steel semifinished items metal restructuring in mechanical engineering

Kinds of defects in cast steel and their influence on properties of an alloy are resulted. Stability of structural heterogeneity and liquating phenomenon at the stage of technological restructuring of steel is shown. Decisions are offered on liquation of line and isle structural heterogeneity, preservation of a fine-grained structure and localization of separate metallurgical defects in steel products. © IDOSI Publications, 2013

Teores de minerais em polpas e cascas de frutos de cultivares de bananeira

The objective of this work was to determine the dry matter percentage, the mineral content, and the ability to supply minerals, based on dietary reference intake in the pulp and peel of unripe and ripe fruits of 15 banana cultivars. Four bunches were used per cultivar, and six fruits per sample unit. Fresh pulp and peel samples were collected for sulfuric (0.2 g) and nitric perchloric (0.5 g) digestions. The following were determined: in the sulfuric extract, total N by the Kjeldahl method; and, in the nitro perchloric extract, P, K, Ca, Mg, Cu, Mn, Fe, Zn, and Se. P was determined by colorimetry, and the other nutrients by atomic absorption spectrophotometry. The mineral content in the pulp and peel was expressed based on the average of the two stages. There are differences between banana cultivars regarding the concentration of macro‑ and micronutrients in the pulp and peel, but not between unripe and ripe fruits. The Terrinha cultivar showed the highest percentage of dry matter in the pulp, and the Marmelo and Maçã cultivars in the peel. For N, P, Fe, Zn, and Cu, the peel showed twice the content of the pulp. The content of K and Mn in the peel was approximately four times that of the pulp. The pulp of the Caipira (AAA) cultivar, and the peel of the Prata and Pacovan (AAB) cultivars show the highest mineral contents.O objetivo deste trabalho foi determinar a percentagem de matéria seca, o teor de minerais e a capacidade de fornecimento de minerais, com base na ingestão dietética de referência na polpa e na casca de frutos verdes e maduros de 15 cultivares de bananeira. Utilizaram-se quatro cachos por cultivar e seis frutos por unidade amostral. Foram coletadas amostras frescas da polpa e da casca, para digestões sulfúricas (0,2 g) e nitroperclóricas (0,5 g). Foram determinados: no extrato sulfúrico, o N total pelo método Kjeldahl; e, no extrato nitroperclórico, P, K, Ca, Mg, Cu, Mn, Fe, Zn e Se. O P foi determinado por colorimetria, e os demais nutrientes, por espectrofotometria de absorção atômica. O teor de minerais na polpa e na casca foi expresso com base na média dos dois estádios. Há diferenças entre cultivares de bananeira quanto à concentração de macro e micronutrientes na polpa e na casca, mas não entre frutos verdes e maduros. A cultivar Terrinha apresentou a maior percentagem de matéria seca na polpa, e as cultivares Marmelo e Maçã, na casca. Para N, P, Fe, Zn e Cu, a casca apresentou duas vezes o teor da polpa. O teor de K e Mn na casca foi de aproximadamente quatro vezes o da polpa. A polpa da cultivar Caipira (AAA) e a casca das cultivares Prata e Pacovan (AAB) apresentam os maiores teores de minerais