UDC 669.111.2:669.162.624
Ivanov V., associate professor, c.t.s.
Pirozhkova V., senior staff scientist, c.t.s.
Lunev V., head of a chair, d.t.s

INFLUENCE OF SULPHUR IS ON MORPHOLOGY OF GRAPHITE IN CASTIRONS

Zaporozhe national technical university

It is set the petrographic and metallographic methods of research, that high
maintenance of carbon and silicon is in cast-irons, and also their impoverished after
oxygen, promote activity of sulphur, which can form connection with these elements and
included in difficult hard solutions. In grey cast-irons sulphur represses superficial activity
of monoxide of silicon, which is responsible for morphology of lamella graphite, and can
distort his form, adsorbed on the surface of polycrystal disseminations. In high-strength
cast-irons morphology of graphite is stipulated by the submagnox (Mg2O) also
impoverished after oxygen. Sulphur, in the case of her ultrahigh concentration (more than
0,02 %), will enter into co-operation, first of all with magnesium and to interfere with
formation of monomagnox.
Keywords: cast-iron, sulphur, oxygen, morphology, dissemination of graphite

NFLUENCE OF SULPHUR IS ON MORPHOLOGY OF GRAPHITE IN CASTIRONS