Structure and properties of Fe-C-B sintered steels

Gennadii A. Bagliuk ,  Svietlana G. Napara-Volgina ,  Vladimir Volfman 

Institute for Problems in Materias Science (IPMS), 3, Krzhizhanivsky Str., Kiev 03680, Ukraine

Abstract
The application of boron opens up possibilities for production of low-alloyed steels which operational characteristics in many cases are not inferior, but also surpass the properties level of steels produced with application of traditional alloying methods. The ample opportunities on working out of boron-containing materials of different functions are opened by the powder metallurgy, which application allows to produce both wearprof  steels containing raised quantity of boron (up to several percent), and high-strength lean alloy steels of constructional appointment.

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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Presentation: Oral at E-MRS Fall Meeting 2009, Symposium I, by Gennadii A. Bagliuk
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-24 11:40
Revised:   2009-06-07 00:48
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