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The TEM study of structure of 1H18N9T stainless steel buildups

Presz W., Kaczorowski M.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 17, nr 1-2

393--396

Purpose: The reason of investigation was finding the answer of the question what was the reason of extreme hardness of build-ups created during bulk metal forming processes of austenitic stainless steel. Design/methodology/approach: The studies were conducted using transmission electron microscopy (TEM). Since very specific specimens special method for thin foil preparation were elaborated. Thin foil method was chose because it was only one which supply both structure and diffraction information. Findings: On the basis of careful analysis structural and electron diffraction pattern it was proposed that simultaneously to very well known strengthening mechanisms like grain refinement and dislocation density increase, the additional mechanism can not be excluded. Based mostly on the electron diffraction pattern (appearance of forbidden reflexes for FCC) it is proposed that this additional mechanism could be the marthensitic transformation caused by very high plastic deformation. Practical implications: At this moment it is difficult to point out the practical implications of the result however the mechanism proposed in this elaboration might be used in design of high strength materials. Originality/value: The main achievement of this investigation is TEM results which analysis allow to propose that an extra-mechanism for strengthening of 1H18N9 stainless steel is marthensitic transformation involved with high plastic deformation in build-ups. Additionally the special method of thin foils preparation was elaborated.

Effects of passing and melting of accretions on the blast furnace process

Frohlichova M., Frohlich L., Kuckova A., Barbusova S.

Hutnik, Wiadomości Hutnicze

2006

Vol. 73, nr 7

336-339

The paper is oriented on the accretions in the blast furnace that still change their mass, dimensions and volume. The changes of accretions are caused by incidental factors and they have narrow connection with dynamics of blast furnace work place. There are permanent conditions that enable perpetually formation and destruction of accretions and their changes in the blast furnace. The accretions lost and go to the lower part of the blast furnace spontaneously or by technological measures and they aggravate parameters of pig iron production, reduce productivity and enhance fuel consumption.

W artykule omawiane są problemy narostów w wielkim piecu, a przede wszystkim zmiany ich masy, wymiarów i objętości. Zmiany te są powodowane przez incydentalne czynniki i mają ograniczony związek z dynamiką pracy wielkiego pieca. W wielkim piecu stale wy-stępują warunki, które umożliwiają ciągłe tworzenie i niszczenie narostów oraz ich zmiany. Narosty odrywają się i schodzą w niższe rejony wielkiego pieca w sposób niewymuszony lub wskutek technologicznych zabiegów, co pogarsza parametry produkcji surówki żelaza, zmniejsza wydajność i zwiększa zużycie paliwa.