Struktura wlewków ciągłych ze stali niestopowych i niskostopowych oraz jej ewolucja w wyniku przeróbki plastycznej na gorąco

• Autorzy: Garbarz B.

Identyfikatory

DOI

10.32730/imz.0137-9941.18.4.1

Warianty tytułu

EN

Structure of continuously cast ingots of unalloyed and low alloy steels and its evolution as a result of hot working

• Języki publikacji: PL

Abstrakty

PL

W artykule przedstawiono systematykę morfologiczną struktur powstających we wlewkach ciągłych ze stali niestopowych i niskostopowych. Scharakteryzowano pierwotną strukturę krzepnięcia (strukturę dendrytyczną) oraz ziarnową strukturę austenitu pierwotnego. W zależności od składu chemicznego stali, warunków krzepnięcia i stygnięcia wlewka ciągłego oraz od zastosowanych metod ujawniania elementów morfologicznych, jedna z tych struktur może być dominująca lub ich obrazy mogą się nakładać. Wykazano, że po początkowym okresie wzrostu fazy austenitycznej w korelacji ze strukturą dendrytyczną, w stadium rozrostu ziarna pierwotnego austenitu tracą związek z dendrytyczną strukturą krzepnięcia. Opisano cztery główne typy struktur wlewków ciągłych, powstające w wyniku przemian fazowych i strukturalnych poniżej zakresu perytektycznego, w zakresie podperytektycznym, w zakresie nadperytektycznym oraz powyżej zakresu perytektycznego. Przeanalizowano potencjalne oddziaływania dendrytycznej struktury krzepnięcia i struktury ziarnowej austenitu pierwotnego na jakość wlewka ciągłego i wyrobów stalowych, w szczególności przedstawiono wpływ segregacji międzydendrytycznej na powstawanie pasmowości mikrostrukturalnej w wyrobach stalowych.

EN

The paper presents morphological systematics of structures developing in continuous ingots of unalloyed and low alloy steels. Primary solidification structure (dendritic structure) and primary austenite grain structure were characterized. Depending on chemical composition of steel, conditions of solidification and cooling of continuous ingot and used methods of revealing of morphological features, one of the structure can prevail or their images can overlap. It was shown that after preliminary stage of the growth of austenitic phase in correlation with the dendritic structure, during further coarsening the primary austenite grains lose correlation with the solidification dendritic structure. Four general types of continuous ingots structures were described which develop as the result of phase transformations occurring below the peritectic range, in the hypo-peritectic range, in the hyper-peritectic range and beyond peritectic range. Potential effects of dendritic solidification structure and primary austenite grain structure on quality of continuous ingot and steel products were analysed, in particular the effect of interdendritic segregation on occurrence of microstructural banding in steel products was presented.

Słowa kluczowe

PL

krzepnięcie stali; struktura wlewka ciągłego; pasmowość mikrostrukturalna

EN

solidification of steel; structure of continuous ingot; microstructural banding

• Wydawca: Instytut Metalurgii Żelaza im. Stanisława Staszica
• Czasopismo: Prace Instytutu Metalurgii Żelaza
• Rocznik: 2018
• Tom: T. 70, nr 4
• Strony: 2--23
• Opis fizyczny: Bibliogr. 72 poz., rys.

Twórcy

autor

Garbarz B.

• Instytut Metalurgii Żelaza im. St. Staszica

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).