Sinter-hardening powder and their sintered compacts
A technology of sinter hardening and powder, which is applied in transportation and packaging, metal processing equipment, etc., and can solve the problems that there is no sinter hardening alloy.
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example 1
[0026] Example 1: Use the ingredients of Example 1 shown in Table 1 to mix powders of various required components of 0.1-30 μm and 7wt% binder in a Z-type high-shear mixer at 150°C for one hour and then cool , to obtain granular shot material, put the shot material into the injection machine to make a tensile test bar (the standard test bar of the American Powder Metallurgy Association MPIF50), the test bar after injection is degreased by the degreasing steps commonly used in the industry, and then in In the vacuum sintering furnace, the temperature is raised from room temperature to 650°C at a rate of 5°C per minute and maintained for one hour, and then raised to 1200°C at a rate of 10°C per minute, and then sintered at 1200°C for two hours and cooled in a furnace The hardness of HRC51 and the ductility of 1.0% can be obtained without heat treatment. After tempering at 180°C for two hours, the ductility can be improved to obtain a strength of 1800MPa, a hardness of HRC45 and ...
example 2
[0027] Example 2: The same process as Example 1, but the composition is changed to the composition of Example 2 in Table 1. The strength of the prepared test bar after tempering can reach 1780MPa tensile strength, HRC45 hardness and 4% ductility .
[0028] Example 3: With the composition of Example 3 in Table 1, use 75 μm Fe-3Cr-1.5Mo pre-alloyed powder, add nickel powder, graphite powder and lubricant, and dry press to form, then degrease at 550 ° C for 15 minutes, and then Sintered at 1250°C for two hours, at this time the density of the sintered body is 7.2g / cm 3 , The obtained test rod can reach the strength of 1320MPa after tempering, the hardness of HRC39 and the elongation of 2%.
[0029] Example 4: The process is the same as Example 3, but the composition is changed to the composition of Example 4 in Table 1. After tempering, the obtained test rod can reach the strength of 1280MPa, the hardness of HRC38 and the elongation of 2%.
[0030] Example 5: The same process a...
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