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Cast heat treatment
For casting engineers and mechanical structure design engineer, heat treatment is a very meaningful, and with a very high value to improve the method of material quality, through heat treatment can change or influence the organization and properties of cast iron, and can obtain higher strength, hardness, and improve the wear resistance and so on.
Because the purpose is different, very many different kinds of heat treatment, basic can be mainly divided into two categories, the first kind of organization structure is not changed by heat treatment or should not be changed, the second is the basic organizational structure change.
The first heat treatment procedure is mainly used to eliminate internal stress, which is caused by different cooling conditions and conditions during casting. The structure, strength and other mechanical properties are not significantly changed due to heat treatment. For the second type heat treatment, there are obvious changes in al qaeda, which can be divided into five categories:
(1) the softening annealing: its purpose is to decompose carbide, its hardness is reduced, and improve the processing performance, for the spherical graphite cast iron, its aim is to obtain iron group has a very high fertility.
(2) normalizing treatment: the mechanical properties of uniform distribution are obtained mainly by improving or making the cast products of the cast iron group.
(3) quenching: mainly to obtain higher hardness or abrasion strength, at the same time to very high surface abrasion resistance.