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Research, Optimization and Starting the Production of Heavy High-Alloy Cast Irons
Kaňa, Václav ; Elbel, Tomáš (referee) ; Martínek, Ludvík (referee) ; Šenberger, Jaroslav (advisor)
The work is particularly aimed at metallurgical problems connected with manufacture of castings of weight about 1 up to 40 tons from high-alloy austenitic nickel cast irons also known under the trade name Ni-resist. The main aim is to check and complement the knowledge about manufacture of heavy castings from austenitic nickel cast irons in a field of control of tapping and casting temperature, carbon content control with regard to the prediction of eutectic composition and in a field of setting a suitable chemical composition of cast iron with regard to the formation of chunky graphite and stability of the austenitic matrix and further on also possibilities of cast iron filtration during pouring the castings. Based on done experiments the formulae were determined that enable to calculate eutectic and liquidus temperatures on the basis of chemical composition of the cast iron. The use of several formulae given in the literature for calculating the carbon equivalent of austenitic nickel cast irons was compared and evaluated. For utilization of determined results in practice a calculating programme has been compiled making possible to be used in operational practice. This programme is named Calculation of casting temperature of Ni-resist cast irons. After the entry of the melt chemical composition the programme calculates the all important parameters necessary to know and to be controlled for manufacture of high quality castings from austenitic nickel cast irons. Eutectic temperature, liquidus temperature and then based on it the tapping and casting temperatures are included among those parameters. Further on there are eutectic concentration of carbon, carbon equivalent, nickel equivalent, and a criterion evaluating a danger of chunky graphite formation.
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Alloyed cast irons and their application in practice
Mokrý, Jan ; Pernica, Vítězslav (referee) ; Kaňa, Václav (advisor)
This thesis is dealing with alloyed cast irons. Cast irons are in principle casting better than the alloyed steels mainly due to their lower melting temperature. The thesis describes the influence of individual elements on the properties of cast iron, their ability to solidify stably or metastably and also about their subsequent suitable use. Since the alloy cast iron is less well known, therefore this thesis may be useful for students and engineers, especially because of the high and untapped potential of alloyed cast irons. This thesis, based on study of literature, summarizes their main types, advantages, disadvantages and the use in practice.
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High-alloyed cast irons Ni-resist and treir properties
Matulová, Anna ; Záděra, Antonín (referee) ; Kaňa, Václav (advisor)
This master’s thesis deals with high-alloyed Ni-Resist cast irons and their properties. The theoretical part describes their chemical composition and individual elements from which are these cast irons composed, their characteristic properties and examples of use in practice. Furthermore, the work focuses on the wear of materials, especially on abrasive wear, because Ni-Resist casts iron exhibit a number of specific properties, such as corrosion resistance, refractoriness and heat resistance and also abrasion resistance, on which is this thesis focused. Attention is also paid to other abrasion resistant materials, because specimens from different materials are compared in the practical part in order to find a more suitable material for the production of plate castings into the shakeouts.
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High-alloyed cast irons Ni-resist and treir properties
Matulová, Anna ; Záděra, Antonín (referee) ; Kaňa, Václav (advisor)
This master’s thesis deals with high-alloyed Ni-Resist cast irons and their properties. The theoretical part describes their chemical composition and individual elements from which are these cast irons composed, their characteristic properties and examples of use in practice. Furthermore, the work focuses on the wear of materials, especially on abrasive wear, because Ni-Resist casts iron exhibit a number of specific properties, such as corrosion resistance, refractoriness and heat resistance and also abrasion resistance, on which is this thesis focused. Attention is also paid to other abrasion resistant materials, because specimens from different materials are compared in the practical part in order to find a more suitable material for the production of plate castings into the shakeouts.
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Alloyed cast irons and their application in practice
Mokrý, Jan ; Pernica, Vítězslav (referee) ; Kaňa, Václav (advisor)
This thesis is dealing with alloyed cast irons. Cast irons are in principle casting better than the alloyed steels mainly due to their lower melting temperature. The thesis describes the influence of individual elements on the properties of cast iron, their ability to solidify stably or metastably and also about their subsequent suitable use. Since the alloy cast iron is less well known, therefore this thesis may be useful for students and engineers, especially because of the high and untapped potential of alloyed cast irons. This thesis, based on study of literature, summarizes their main types, advantages, disadvantages and the use in practice.
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|
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Research, Optimization and Starting the Production of Heavy High-Alloy Cast Irons
Kaňa, Václav ; Elbel, Tomáš (referee) ; Martínek, Ludvík (referee) ; Šenberger, Jaroslav (advisor)
The work is particularly aimed at metallurgical problems connected with manufacture of castings of weight about 1 up to 40 tons from high-alloy austenitic nickel cast irons also known under the trade name Ni-resist. The main aim is to check and complement the knowledge about manufacture of heavy castings from austenitic nickel cast irons in a field of control of tapping and casting temperature, carbon content control with regard to the prediction of eutectic composition and in a field of setting a suitable chemical composition of cast iron with regard to the formation of chunky graphite and stability of the austenitic matrix and further on also possibilities of cast iron filtration during pouring the castings. Based on done experiments the formulae were determined that enable to calculate eutectic and liquidus temperatures on the basis of chemical composition of the cast iron. The use of several formulae given in the literature for calculating the carbon equivalent of austenitic nickel cast irons was compared and evaluated. For utilization of determined results in practice a calculating programme has been compiled making possible to be used in operational practice. This programme is named Calculation of casting temperature of Ni-resist cast irons. After the entry of the melt chemical composition the programme calculates the all important parameters necessary to know and to be controlled for manufacture of high quality castings from austenitic nickel cast irons. Eutectic temperature, liquidus temperature and then based on it the tapping and casting temperatures are included among those parameters. Further on there are eutectic concentration of carbon, carbon equivalent, nickel equivalent, and a criterion evaluating a danger of chunky graphite formation.
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