The low temperature aluminising kinetics of hot-work tool steels

are mostly conducted at temperatures well above 900 °C, and can last for hours. When applied to hot-work tool steels, aluminising has to be done at notably lower temperatures in order to prevent grain growth and carbide formation, and to improve creep resistance. The kinetics of aluminium coating fo...

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Published inJournal of heat treatment and materials : HTM = Zeitschrift für Werkstoffe, Wärmebehandlung, Fertigung Vol. 67; no. 2; pp. 133 - 139
Main Authors Matijević, B., Kumić, I., Belić, T.
Format Journal Article
LanguageEnglish
Published De Gruyter 01.04.2012
Subjects
Aluminid-Beschichtung
aluminide coatings
Aluminisierung
Aluminising
design experiments
Statistische Versuchsplanung
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Summary:are mostly conducted at temperatures well above 900 °C, and can last for hours. When applied to hot-work tool steels, aluminising has to be done at notably lower temperatures in order to prevent grain growth and carbide formation, and to improve creep resistance. The kinetics of aluminium coating formation on hot-work tool steels was studied in the temperature range of 550–610 °C. The pack Al content was varied from 5–15 wt.-% and aluminising time from 1–9 hours. The halide activator AlCl was applied. A series of statistically designed experiments were conducted to determine how key process factors influence the aluminide coating formation. A Box-Behnken experimental design was used to evaluate three process factors at three levels. The microstructures of coated samples were analysed by a scanning electron microscope (SEM). Glow Discharge Optical Spectroscopy (GDOS) and energy-dispersive X-ray spectroscopy (EDX) were employed to investigate element distributions in the coating layer
ISSN:1867-2493
2194-1831
DOI:10.3139/105.110139