Naslov
Effect of Cooling Rate on Hot Ductility and Mechanism of the Phase Transformation by Solidification of Tool Steels

Autori
Kalinushkin, E. ; Mamuzić, Ilija ; Taran, Ju.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Sažeci predavanja s 3. Međunarodnog simpozija hrvatskih metalurga "Stanje i razvitak plastične obradbe kovina i slitina" tiskano u časopisu "Metalurgija" 37(1998)2, 103-132 / Mamuzić, Ilija - Zagreb : Hrvatsko metalurško društvo, 1998, 116-116

Skup
3. Međunarodni simpozij hrvatskih metalurga

Mjesto i datum
Šibenik, Hrvatska, 25.06.1998. - 27.06.1998

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
cooling rate; phase transformation; tool steels

Sažetak
The presently used high-speed and other alloyed tool steels are characterized by low hot ductility; this is due to peculiarities of their structure in the cast state which forms as result of complex multistage crystallization: L--->d-ferrite; L+d-ferrite--->austenite; L--->austenite+K. The principal peculiarity of the solidification transformations is the peritectic reaction. The special investigations carried out using original quenched installation show that this reaction has the following mechanism which differs from the others, existing at present days their is a thin interlayer of liquid metal on the d/g interface; this interlayer is connected with the interdendritic melt through gaps in the austenite envelope. An increse cooling rate causes fuller completion of the peritectic reaction and makes the austenite grains finer. This is due to diffusional exchange of the alloying components effected principally through the liquid phase, which penetrates deeply in primary grains. The optimization the cooling rate on the stage of peritectic reaction makes it possible to increase the hot ductility of high-speed steels up to 1.5 times.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

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