5. Blackheart Malleable Cast Iron
Blackheart malleable cast iron is made almost the same as that performed in the manufacture of malleable cast iron whiteheart but decarburisasi during the heat treatment process must be protected or expense is spared the possibility of air from inside the box carburisasi therefore made of neutral materials and equipped with supporters The casting objects.
This process will lead to the disintegration of form cementite structure, in which the development of the element composition of carbon in the ferrite matrix. treated cast iron is cast iron it contains the element carbon above 2.4% with particular attention to the amount of the composition during melting.
Blackheart malleable cast iron with a standard british enrolled in grade in accordance with the voltage number and percentage increase in length. Blackheart malleable cast iron cast iron whiteheart not as good as in the nature of castability due to a lower content of carbon element.
Blackheart malleable cast iron used in the automotive industry as well as various kedaraan commersial where the quantity of blackheart malleable cast iron backwardly castability, vibration resistant (shock resistance), easy in machining (macinability), commonly used in products exle houshing rear, wheel hubs, differential cariers, also pedal, brake lever komponene, axle box, coupling parts and various agricultural implements, railway and others.
6. Pearlitetic Malleable Cast Iron
Pearlitetic malleable cast iron is made with malleable cast iron whiteheart material through the process of heat treatment (heat treatment), as in the manufacture of blackheart malleable cast iron. Pearlitetic dipeoleh matrix of ferritic matrix. pearlitetic matrix formed by increasing the levels of manganese up to 1% of manganese is an element in which the binder and form a stable carbide in pearlite is directed to a process for heat treatment convesional blackheart malleable cast iron, or by heating ferritic blackheart malleable cast iron. namely heating at a temperature of 8500C and air or oil quenching and tempering followed.
As an alternative to white cast iron with the same composition can be used as materials for blackheart malleable cast iron with air quenching followed by tempering, but this method is not a malleabilising process. All processes are carried out to achieve the equivalent of a steel matrix. Excess carbon element can be overcome by the tempering process as needed.
Heatreatmen process can change the shape of the arrangement of atoms (matrix) and stimulate decoposition products with variations betuk austenite structure of pearlite or spheriodite lammelar carbides, as the process of tempering martensite structure in steel (stainless).
Pearlitetic malleable cast iron is listed on the British standards in two grade according to the voltage according to the number and percentage of increase in length. Pearlitetic malleable cast iron can be hardened by flame and induction hardened method that can improve the overall mechanical properties. development of the use of malleable cast iron pearlitetic increasing especially shock-resistant material products (shock resistance), specifically used as exle and differential housings, cam shafts and gear.