Výzkum segregace vybraných prvků v oblasti průvalu kontinuálně odlévané ocelové bramy

Investigation into Segregation of Selected Elements in the Breakout Area of a Continuously Cast Steel Slab

conference paper

en

The paper deals with investigation into segregation behavior of selected elements in longitudinal cut of steel slab, in the breakout area. The breakout occurred after a flying tundish change at a steel grade changing. Altogether 11 samples were taken from the part of a solidified slab. Samples were taken both from the breakout areas and from the areas not affected by the breakout. On these samples concentrations of selected elements (Al, Si, P, S, Cr, Mn, Ni and Mo) were measured using scanning electron microscope and energy dispersive spectroscopy. Concentration data were measured on each sample in 101 points along selected line of 1000 micrometer. Concentration data from the individual samples were then subjected to basic statistical analysis. Using the original mathematical models the basic micro-segregation characteristics were further determined for each analyzed element. The parameter of macro-heterogeneity was also determined for individual elements from the measured concentration data. Results ( the segregation characteristics ) were interpreted with respect to the known technological parameters of casting.

Článek se zabývá výzkumem segregace vybraných prvků v podélném řezu ocelové bramy v oblasti průvalu., který vznikl v důsledku rychlé výměny mezipánve. Bylo odebráno celkem 11 vzorků z oblasti průvalu i mimo tuto oblast. Bylas měřena koncentrace vybraných prvků (Al, Si, P, S, Cr, Mn, Ni a Mo). Koncentrační data byla měřena ve 101 bodech na vybrané linii 1000 mikrometrů a následně statisticky vyhodnocena. Za použití originálního matematického modelu byly stanoveny základní mikro segregační charakteristiky každého prvku. Rovněž byl pro analyzované prvky stanoven parametr makro heterogenity. Segregační charakteristiky byly vyhodnoceny s ohledem na známé technologické parametry lití.

The paper deals with investigation into segregation behavior of selected elements in longitudinal cut of steel slab, in the breakout area. The breakout occurred after a flying tundish change at a steel grade changing. Altogether 11 samples were taken from the part of a solidified slab. Samples were taken both from the breakout areas and from the areas not affected by the breakout. On these samples concentrations of selected elements (Al, Si, P, S, Cr, Mn, Ni and Mo) were measured using scanning electron microscope and energy dispersive spectroscopy. Concentration data were measured on each sample in 101 points along selected line of 1000 micrometer. Concentration data from the individual samples were then subjected to basic statistical analysis. Using the original mathematical models the basic micro-segregation characteristics were further determined for each analyzed element. The parameter of macro-heterogeneity was also determined for individual elements from the measured concentration data. Results ( the segregation characteristics ) were interpreted with respect to the known technological parameters of casting.

mikro segregace, kontinuálně litá brama, ocel, průval, vnitřní promíchávání

micro-segregation, continuously cast slab, steel, breakout, intermixing

2012

23.05.2012

Tanger

Ostrava

978-80-87294-31-4

METAL 2012 Conference proceedingd (CD-ROM)

115–121

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