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2 2004

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The question of producing high quality ingots from Cu-Ni alloys

Laščenko D. D., Brusnicyn S. V., Mysik R. K., Titova A. G., Demakov V. N.

Archiwum Odlewnictwa

2004

R. 4, nr 11/1

299--305

Cu-Ni alloys are corrosion-resistant and are widely applied for making production of responsible use. Tubes, sheets, rods which have been made of are used in atomic boilers, shipbuilding, electrical engineering, and deferent heat-exchanges. Since Cu-Ni alloys have high melting temperature, conditions of falling off liquid phase boundary level bellow die are created during the semicontinuous casting. It usually lead to formation columnar structure and high probability of formation inner shrinkage cracks. In order to reduce probability of formation inner shrinkage cracks during the semicontinuous casting, influence of modifiers and different additions on reducing of grains in ingots have been studied. The results of the investigation have been put into technology improvement of existing engineering process.

Analysis of silicon influence on microstructure of high-alloy brass Cu70Mn7Al5Fe2Si2Pb1

Kotov D. A., Mysik R. K., Tropotov A. V., Brusnicyn S. V., Demakov V. A.

Archiwum Odlewnictwa

2004

R. 4, nr 11/1

274--280

Products from multialloy brasses are used in conditions both wear and impact load. Particular structure is formed, which provide required level both stress-strain properties and wear resistance due to high alloying of brasses. In this connection high requirements of phase ratio quantification and morphology of intermetallic inclusion are produced to products from multialloy brasses. In the scientific work were studied such subjects as: - influence of ferrum and silicium which are main intermetallic forming components on microstructure of multialloy brasses; - stress-strain propertics both cast cendition and extruded condition. The investigationd lowed to correct the percentage of intermetallic forming components in the multialloy brasses.