Influence of compound deoxidation of steel with Al, Zr, rare earth metals, and Ti on properties of heavy castings

• Autorzy: Senberger J. , Cech J. , Zadera A.
• Języki publikacji: EN

Abstrakty

EN

Heavy steel castings deoxidized with aluminium are sometimes brittle intercrystalline failed during their service along primary grain boundaries what is initiated by aluminium nitrides and so called conchoidal fractures are formed. The tendency to forming the conchoidal fractures depends in particular on cooling rate (the casting modulus), aluminium and nitrogen contents in steel. During deoxidation, when manufacturing heavy castings, the elements with high affinity to nitrogen, zirconium or titanium, are added to steel that would decrease nitrogen activity by the bond on stable nitrides. The formation of stable nitrides should reduce the tendency of steel to the formation of conchoidal fractures. Deoxidation was thermodynamically analyzed at presence of the mentioned elements. For particular conditions a probable course of deoxidation was estimated at test castings. The deoxidation course was checked by microanalysis of deoxidation products (inclusions). For service and experimental castings the anticipated composition of inclusions was compared. It has been proved that in heavy castings with high aluminium contents in steel under studied conditions neither the addition of zirconium nor of titanium nor of rare earth metals will prevent the formation of conchoidal fractures.

Słowa kluczowe

EN

steel casting; deoxidation; conchoidal fractures; heavy casting

PL

odlewanie stali; odtlenianie; odlew ciężki

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2012
• Tom: Vol. 12, iss. 1
• Strony: 99--104
• Opis fizyczny: Bibliogr. 5 poz., rys., tab.

Twórcy

autor

Senberger J.

autor

Cech J.

autor

Zadera A.

• Department of Foundry, Institute of Engineering Technology, Brno University of Technology, Brno, Czech Republic,

Bibliografia

• [1] Senberger, J., Zadera, A. & Cech, J. (2011). Influence of deoxidation on properties of steel cast in heavy castings. In 48th Foundry Days, 11th - 12th October. Brno, Czech Republic.
• [2] Senberger, J., Zadera, A., Carbol, Z., Pluhacek, J., Krutis, V. & Kovac. M. (2011). Segregation in heavy castings and its influence on material properties. In Theory and practice of steel manufacture and treatment (63-69).
• [3] Fremund, P. (1962). Rack-candy fractures. Slevarenstvi. 10 (6), 205-213.
• [4] Stránský, K. & Foret, R. (1977). Effect of aluminium on the properties of steel for castings. Slevarenstvi. 25 (5), 207-211.
• [5] Buzek, Z. (1979). Basic thermodynamic data about metallurgical reactions and interactions of elements in systems important for metallurgical theory and practice. Hutnicke Aktuality. 1-2.