Effect of alloying on austenite grain size of magnesium cast iron
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High-strength magnesium cast iron is an inherently fine-grained material with relatively fine grains of austenite after heating at 900–950° for 5h and at 1000° for 30 min
Alloying of cast iron with 0.8% Cu, 1% Ni, and 0.09% Sn reduces the susceptibility to grain growth in the process of heating at temperatures up to 950°.
After heating at higher temperatures the austenite grains in alloyed cast iron may be larger than in unalloyed cast iron.