Abstract
Determined was quantitative effect of nickel equivalent value on austenite
decomposition degree during cooling-down castings of Ni-MnCu cast iron.
Chemical composition of the alloy was 1.8 to 5.0 % C, 1.3 to 3.0 % Si, 3.1
to 7.7 % Ni, 0.4 to 6.3 % Mn, 0.1 to 4.9 % Cu, 0.14 to 0.16 % P and 0.03
to 0.04 % S. Analysed were castings with representative wall thickness 10,
15 and 20 mm. Scope
of the examination comprised chemical analysis (including WDS), microscopic
observations (optical and scanning microscopy, image analyser), as well as
Brinell hardness and HV microhardness measurements of structural
components.
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