The density and specific heat capacity of die steels. Physical and mechanical properties.
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The saturation magnetization
This characteristic determines the amount of residual austenite contained in the steel die and which, unlike ferrite and martensite is magnetic component. For medium-carbon steels designed for the manufacture of stamps of hot deformation this parameter is set after the quenching, and compared with values of samples that have been subjected to austenization (cooling up to negative temperatures at which the γ phase completely dissolves). For steels of dies for cold deformation such procedure is not possible, so Cakste reference sample used, which was the annealing.
For complex-alloyed steel containing special carbides, the value of magnetization saturation take on the results of approximate calculations.
Die steel, the coercive force is a measure of the structural heterogeneity… It depends on the boundaries between the individual grains of the microstructure, the number and arrangement of dislocations, the level of internal stresses. The parameter of the coercive force used to specify enabling intervals of vacation and intensity of passing in this case the relaxation processes.
Specific electrical resistivity of
To change this setting to judge the intensity of structural transformations in steels steels that occur in the process of heat treatment. The greatest influence on the specific electrical resistivity has a content of alloying elements. For most brands of die steels this parameter ranges from 6 to 8 ASM-5 in the hardening of up to 3…5 ASM-5 — when you leave.
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Thermal conductivity/thermal diffusivity
The change of this characteristics depends on the composition of martensite, which decreases in the quenching process, and increases again during the subsequent vacation. The change in thermo-physical properties for most brands of die steel is made the same way as the change in electrical conductivity. After annealing and hardening, the conductivity decreases and after a holiday are higher. Die steels for cold deformation values of the thermal conductivity is 0.06…0.15 cal/smsguard and die steels for hot deformation is…0,09 0,20 cal/smsguard.
The intensity changes in linear dimensions of parts of stamps in the process of heating associated with the strength of interatomic bonds and composition of the excess phase. The coefficient of thermal expansion is 9,610-6…1410-6, and determines the deformation of the working parts of the stamp after quenching and tempering. The maximum change of the characteristic of die steels that are in the process of heat treatment undergo α↔γ transformation, i.e., the transition to the austenitic state. Therefore, the operation of such steels at temperatures above the critical point, leads to a rapid loss of their health due to the emergence of grid razgarnogo cracks.
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