Heat Treatment of Ductile Iron Casting Parts(II) - Ningbo Fanhua Precision Casting Co., Ltd.

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Heat Treatment of Ductile Iron Casting Parts(II)

Let's continue to talk about the heat treatment of ductile iron casting parts.

2\The heat treatment to improve the overall performance of ductile iron casting parts

To improve the overall performance of ductile iron casting parts is often to eliminate annealing, to improve the toughness of ductile iron casting parts annealing, and to improve the strength of ductile iron casting parts and so on.

(1). Austempered process of ductile iron casting parts
Austempered process of ductile iron casting parts intend to make matrix of cast iron parts converted to a robust lower bainite, the ultimate strength of more than 1100MPa, toughness AK ≥ 32J.

The austempered process of ductile iron casting parts is: after ductile iron parts heating to 830-870 ℃temperature to hold to austenite, put the molten salt into 280-350 ℃ insulation, partial transformation of austenite to bainite, the original non-spherical graphite change to obtain high strength ductile iron casting parts.

(2). Normalizing process to improve the strength of ductile iron casting parts

The purpose of ductile iron casting parts normalizing is converted matrix structure to fine pearlite structure. The process is re-heating the ductile iron casting parts based on the matrix of ferrite and pearlite to a temperature of 850-900 ℃, the original ferrite and pearlite into austenite, and some spheroidal graphite dissolved in the austenite, the After the air-cooled heat fine pearlite into austenite, to improve the strength of ductile iron casting parts.

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