Ductile cast iron
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Detail
The heat treatment of ductile iron has two main purposes: one is to change the matrix structure and improve the performance of cast iron; The second is to eliminate the stress of the casting. It is worth noting that the heat treatment can not change the original graphite shape and distribution of the casting, that is, the graphite that was originally flake or spherical after heat treatment is still flake or spherical, and its size will not change, and the distribution will not change.
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.
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