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Achieved requirement answers after spare parts cementite
From;    Author:Stand originally
To make aggrandizement of surface of cementite spare parts, cementite operation is crucial. It can change the chemical class status of spare parts surface, but the final aggrandizement of spare parts surface depends on subsequently heat treatment. To passing the cementite part of heat treatment the following asks:
(1) surface hardness do not answer under HRC60; Below certain circumstance, low hardness end can fall to HRC56, 58.
(2) expresses facing and the fracture surface that the center is in, all should show fine grain
(3) cementite layer microstructure should by fine acicular or concealed is acicular martensite composition. Carbide is shown bulbiform, the leftover austenite in cementite layer is measured should few, do not allow bound of carbide edge grain to show meshy distributing.
(4) is out of shape twist asks the smallest, avoid oxidation, decarbonization.
(5) makes the center of the important part that make be in with alloy steel, body piece keeps the iron chain that when be patient of quenchs, microstructure did not dissolve in.