Pregled bibliografske jedinice broj: 11458
A STUDY OF A SPECIFIC CASTING DEFECT IN HIGH-MANGANESE STEEL CASTINGS
A STUDY OF A SPECIFIC CASTING DEFECT IN HIGH-MANGANESE STEEL CASTINGS // ZBORNIK REFERATOV 39. LIVARSKEGA POSVETOVANJA / Trbižan, Milan (ur.).
Portorož, Slovenija: Društvo livarjev Slovenije, 1998. str. 29-47 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
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Naslov
A STUDY OF A SPECIFIC CASTING DEFECT IN HIGH-MANGANESE STEEL CASTINGS
Autori
Unkić, Faruk ; Kivač, Zoran ; Živčić, Miroslav
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
ZBORNIK REFERATOV 39. LIVARSKEGA POSVETOVANJA
/ Trbižan, Milan - : Društvo livarjev Slovenije, 1998, 29-47
Skup
39. LIVARSKO posvetovanje s sodelovanjem drzav MEGI
Mjesto i datum
Portorož, Slovenija, 28.05.1998. - 29.05.1998
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
high-manganese steel; cold shut
Sažetak
A characteristic type of defect cold shut or cold lap, which occurs in relatively complicated castings track-blocks, was investigated. Austenitic high-manganese steel castings from industrial production were used. The specimens for microstructure examination were taken at a characteristic location of defects and prepared by the standard metallographic technique. Special attention was given to the detection of inclusion and cold laps. The quality analysis of the precipitated phases in situ was carried out by a scanning electron microprobe analyser. The precipitated phases were determined by X-ray diffraction using a Philips diffractometer and CoK radiation. Metallographic analysis of the specimen shows the appearance of a curved discontinuity of a crack across the confluence weld, which is followed by a series of inclusions and porosity. Etching of microstructure at this location demonstrates decarburization of the surface, which is probably a result of oxidation during heat treatment, and is responsible for martensite presence in this area. A defect in the form of a cold shut is appeared as a result of collision of two melt streams at the place, which is most distant from the ingate of the moulding cavity. Microstructure analysis of a cross section of the sample at the place of cold shut shows the presence of complex manganese, silicon and aluminium oxides, which is caused by the sucking of the thin, fluid surface layer in the bulk melt during the collision of two streams. Inclusions, their origin and the process variables have a major influence on the defect formation.
Izvorni jezik
Engleski
Znanstvena područja
Metalurgija
