Department of foundry of ferrous and nonferrous metals

National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"

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127. Хотите подчинить себе других – начинайте с себя. (Л.Вовенарг)


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Дисертації
Kharchenko Yevhen

Improving Wear Resistance of White Cast Irons for Dredge Pumps Casting Parts

Master’sThesis: 93pp., 32 figures, 24 tables, 27 sources.

StudySubject: dopingprocesses, microalloying, iron-basedinoculationandoperating their properties.

Work Objective: the research of doping and inoculation processes’ impact on the structure and properties of hardwearing white iron for producing molded pieces of dredging pumps.

Research Methods: there have been used modern methods of identifying alloy structures, founding, mechanic, and specific properties in this work.

Master’s Thesis Outcomes: there have been developed identification methods of iron-based alloy enduring quality which provides high precision and test validity.   Chrome-manganese cast-iron with optimal correlation of chrome and manganese is recommended for producing molded pieces of dredging pumps. To provide high enduring quality and durable running of dredging pumps, it is beneficial to additionally micro-alloy chrome-manganese cast-iron with titanium, vanadium, stibium and to inoculate with boracium and rare-earth metals.

Implementation Degree: recommended cast-irons have been tested in founding laboratory of industrial strength.

Application Areas: heat-power engineering, mechanic engineering, metallurgy, chemical industry and others.

Economic Efficiency: design coefficient of the research economic effectiveness (Е = 0,39%) proves viability of completing given Master’s thesis.

Anticipated hypotheses: Cast-iron, recommended for application in this Master’s theses, can be introduced into production.

WEAR-RESISTING ALLOY CAST-IRON, MOULDING, TECHNOLOGICAL PROCESS, MICROALLOYING, INOCULATION, FOUNDING AND SPECIFIC PROPERTIES

 
Diadiura Andrii

Master’s thesis: 88 p., 18 fig., 7 tab., 56 references.
Object of study – structure formation process and change the properties of the alloy AK5M2 treated in liquid state pulsed electric current
Subject of study – patterns of phase changes during curing, the formation of the microstructure and mechanical properties of the alloy AK5M2 depending on the parameters impact on the melt pulsed electric current.
The aim of the work – investigation of the effect of liquid-phase melt processing by pulsed electric current of different density and frequency on the change in the mechanical properties of the AK5M2 alloy.
Research methods – applied research methods metallographic microanalysis, X-ray diffraction studies and physical and mechanical properties (hardness, tensile strength , the linear elongation).
Research results – the optimal mode of liquid phase treatment is set by an electric current.
After processing the melt with a pulsed electric current, the amount of α-phase increases up to 5.6%, which leads to an increase in mechanical properties compared to the initial ones: a temporary tensile strength of 50%, a stiffness of 15%, the relative elongation of 3.6 times.
The solidification process, after the melt treatment by current, is carried out on a metastable diagram of the noequilibrium state, the iron-containing phases that are formed are characterized by the stability of the structure and morphology.
The degree of implementation – samples of the proposed AK5M2 alloy passed laboratory tests.
Areas of application – manufacture of products from industrial AK5M2 alloy made from recycled materials with enhanced mechanical properties.
Forecasting assumptions – obtaining products from the alloy AK5M2, after liquid-phase current processing; the use of technology to improve the mechanical properties of high-strength aluminum alloys

STRUCTURE, AK5M2, MODIFICATION, METALLOGRAPHIC MICROANALYSIS, HEAT TREATMENT, MECHANICAL PROPERTIES.

 
RepetaLiudmyla

Optimization of core mixtures based on resin CFP 011L and the solvent methylacetate

 

Master's thesis: 110pag., 23pict., 12 tabl.,27titles for references.

Object of research - technology of rod mixtures based on silica sand and perlite to expanded production combined polystyrene models.

Subject of investigation - core mixtures based on quartz sand, expanded perlite.

Objectives - the development and optimization of process parameters polystyrene combined production models.

Research methodology - were used modern methods of research and processing of results

The results of processing - the influence of the pivotal components of the mixture and sintering regime on its mechanical properties and the impact of the action of superheated steam for strength and degree of moist saturation.

Area of use - production of castings with complex internal cavities methodology casting for models that gasification machine on the building enterprises.

POLYSTERENE, EXPANDED PERLITE, CORE MIXTURES, COMPONENTBINDERS, SOLVENTS, MODE DRYING, GRAINE SIZE, STRENGTH, MOIST SATURATION

 

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