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Determination of Strains in Enameled Cast Iron
Author(s) -
WUELLNER J. F.,
SWEO B. J.
Publication year - 1955
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1955.tb14564.x
Subject(s) - cast iron , materials science , tension (geology) , metallurgy , enamel paint , ultimate tensile strength , tensile testing , composite material , stress (linguistics) , linguistics , philosophy
A method of determining strains in enameled cast iron using a modification of the split‐ring furnace and employing cantilever‐type specimens is described. Strain curves of several cast‐iron enamels on cast‐iron cantilever‐type specimens are compared with results obtained on split rings. Strain curves are presented which show that cast‐iron enamels may craze at or close to the temperature of maximum tension of the enamels owing to the high degree of tensile strain in the enamels. This maximum tension can be increased by permanent growth of the cast iron. Summary The cast‐iron strip test as modified from the split‐ring test for sheet steel enamels serves as a more direct means of determining the strain existing between enamel and cast‐iron from room temperature to the softening point of the enamel. The cast‐iron strip test shows differences in cast iron enamels that have not been indicated by either the warp or split‐ring tests. Cast‐iron enamels may craze at or close to the temperature of maximum tension, and this crazing is caused by the enamel being subjected to too high a degree of tensile stress during cooling. The degree of tensile strain is increased by the growth of iron which occurs if the temperature is held within, or moves too slowly through, the range of maximum tension of the enamel. By controlling the cooling rate, the strains in enameled cast iron can be altered.