Abstract:
The synthetic
effects of alloys on matrix structure and mechanical properties
of as-cast austempered ductile cast iron (ADI) have been
comprehensively studied. The researches show that it is feasible
to obtain as-cast ADI by adding alloys. The tensile strength can
reach over 900MPa and the elongation over 3%. The as-cast ADI
has good low-temperature impact toughness. At -40℃, the impact
toughness (CVN) is 4.6 J. In as-cast condition, the fracture
toughness is 54 MPam1/2 and can be enhanced nearly 20% after
tempering at 325℃. The researches show that retained austenite (Ar)
has a favourable effect on mechanical properties.
Key words:
Alloy cast iron As-cast cast iron Austempered ductile cast iron
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