The effect of thermal treatment on the mechanical properties of vermicular cast iron

• Autorzy: Mierzwa P. , Soiński M. S.
• Języki publikacji: EN

Abstrakty

EN

The work determines the effect of austempering (isothermal quenching) on the basic mechanical properties of cast iron with vermicular graphite. The cast iron has been produced in one of Polish foundries. Copper addition in the amount of about 1% has been introduced to the cast iron in order to obtain the pearlitic matrix. The mechanical properties (R_m, R_0,2 , A₅, HB) have been determined both for the as-cast state and after austenitizing at 960 °C combined with quenching at 290 °C for 90 minutes, and also after austenitizing at 960 °C followed by isothermal quenching at 290 °C for 150 minutes. It has been found that the thermal treatment, resulting in the cast iron matrix change from the ferritic-pearlitic one to the one composed of acicular precipitates of ferrite and residual austenite, causes a distinct increase in cast iron strength; after the thermal treatment it has reached about 900÷1000 MPa. The examination has been performed using the specimens cut out of the reversed U-block test coupons of walls 25 mm thick and 50 mm high.

Słowa kluczowe

EN

vermicular cast iron; ausferrite cast iron; austenitizing; austempering; mechanical properties

PL

żeliwo wermikularne; żeliwo ausferrytyczne; austenityzowanie; hartowanie izotermiczne; właściwości mechaniczne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 1 spec.
• Strony: 99--102
• Opis fizyczny: Bibliogr. 6 poz., rys., tab.

Twórcy

autor

Mierzwa P.

• Department of Foundry, Technical University of Częstochowa, ul. Armii Krajowej 19, 42-200 Częstochowa, Poland

autor

Soiński M. S.

• Department of Foundry, Technical University of Częstochowa, ul. Armii Krajowej 19, 42-200 Częstochowa, Poland

Bibliografia

• [1] Sorelmetal: About nodular cast iron. Ed. Metals & Minerals Ltd. Warsaw 2006 (in Polish).
• [2] J. A. Kosowski, Principles of foundry, Scientific Edition AKAPIT, Cracow 2008 (in Polish).
• [3] Soiński M. S., Warchala T.: Cast iron for glass industry moulds. Archives of Foundry, vol. 6 (2006), No. 19, pp. 289-294 (in Polish).
• [4] M. Perzyk, S. Waszkiewicz, M. Kaczorowski, A. Jopkiewicz, Founding, WNT Warszawa 2000 (in Polish).
• [5] Polish Standard PN-EN 1564, Founding. Austempered ductile cast irons. PKN, 2000 (in Polish).
• [6] Polish Standard PN-EN 1563, Founding. Spheroidal graphite cast irons. PKN, 2000 (in Polish).