The various modes of boron insertion in powder steels have been studied: boron carbide, amorphous boron powder and powder Fe-B-C master alloy, produced by thermal synthesis from a mixture of iron and boron carbide powders had been applied as boron-containing components. The boront content in the steels were varied within 0,4 - 1,6 %.

In the issue of powder mixtures pressing investigation it is established, that compactibility of mixtures with the identical boron content at pressing essentially worsens with increase of boron master alloy component quantity.

The investigation of sintered materials properties has shown, that application of boron-containing master alloys allows to obtain the higher level of sintered and  thermoprocessed materials physicomechanical properties in comparison with the steels produced from a mixture with boron or boron carbide powders.

The boront content in sintered materials, providing optimum combination of their properties at application of boron-containing master alloy of different composition, makes about 1,2 %: such boron content corresponds with the maximum values of hardness, durability and wear resistance as well as minimum  porosity of both sintered and thermoprocessed materials.

The wear resistance tests had shown, that durability of sintered boron-containing steels substantially exceed the same for the cast and rolled bearing steel with 1% C and 1% Cr.  

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