Castings Precision casting of the heat due to different casting, heat treatment is very much, the basic can be divided into two categories, the first is the organizational structure will not change through heat treatment or should not be changed, the second is the basic organization Structure changes. The first heat treatment procedure is mainly used to eliminate the internal stress, which is caused by the cooling conditions and conditions in the stainless steel casting process. Organization, strength and other mechanical properties, not due to heat treatment and significant changes.
Castings For the second type of heat treatment and the main base organizations have undergone significant changes can be broadly divided into five categories:
1, softening annealing: its main purpose is to break down the carbide, its hardness is reduced, and improve the processing performance, for ductile iron, its purpose is to get more ferrite.
2, normalizing treatment: the main purpose is to obtain pearlite and sorbite to improve the mechanical properties of stainless steel casting.
3, quenching: mainly in order to obtain a higher hardness or wear strength, while the very high surface wear characteristics.
4, surface hardening treatment: mainly to obtain the surface hardened layer, while the very high surface wear characteristics.
5, precipitation hardening treatment: mainly to obtain high strength and elongation does not occur so drastic changes.
Castings Description of the casting The liquid metal is cast into the casting cavity which is compatible with the shape of the part. After it is cooled and solidified, the method of obtaining part or blank is called casting. Casting method to obtain castings called casting parts.
Casting structural design: to ensure its work performance and mechanical performance requirements, taking into account the casting process and alloy casting performance on the casting structure requirements, casting structure design is reasonable or not, the casting quality, productivity and cost have a great impact.