Ductile cast iron
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The heat treatment process of ductile iron parts includes quenching and tempering treatment. The purpose of quenching treatment is to obtain a higher hardness of cast iron. The specific process is: the casting is heated to a temperature of 860-900 ° C, and the original matrix is fully austenitized and then cooled in oil or molten salt to achieve quenching. The purpose of tempering treatment is to obtain better comprehensive mechanical properties of castings. The specific process is: the quenched casting is heated and tempered at 250-350℃, the original matrix is converted to tempered martensite and residual austenite structure, and the original spherical graphite form is unchanged.
In addition, silicon can raise the start and end temperatures of the eutectoid transition. Especially when the silicon content exceeds 2%, the critical point temperature of eutectoid transition increases significantly. In the sampling of cast steel, the blank sample should be cast separately and heat-treated together with the casting represented.
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