engleski

Transformations characteristics of dual matrix structures ADI

In presented study Ni, Cu, Mo low alloyed spheroidal graphite cast iron intended for austempering and production of castings GJS grade 800-10 in according to HRN-EN 1564: 2011 was investigated. Spheroidal graphite cast iron was produced by so called duplex melting procedure and melt treatment by Sandwich method. The investigations samples where taken from the casting with relevant thickness of 50 mm, which was poured in the green sand mould. On the base of chemical composition by Thermo-Calc (TCW 4) programme, the equilibrium phase diagram was constructed and upper and lower critical temperatures were calculated, which define the intercritical austenitising interval or interval of partial austenitisation. Simultaneous thermal analysis of low alloyed spheroidal graphite cast iron by differential scanning calorimetry (DSC) method was also performed and the relevant temperatures of eutectoide phase region determined. On the basis of metallographic analyses by Analysis ®´Materials Research Lab software, in the intercritical interval annealed and in water quenched samples of spheroidal graphite cast iron, the share of individual phase was determined depending on the partially austenitised cast iron temperature.

Ausferritic spheroidal cast iron ; Characteristics of transformations ; Dual matrix structure ; Intercritical austenitising temperature

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