Features of the Structure Formation of Diffusion Boride Layers upon Preliminary Activation

The features of the structure formation of diffusion layers obtained by technology, including preliminary surface treatment of steel products made of U8 steel and subsequent boriding in powder media, have been investigated. The pretreatment consisted of dynamic alloying in the superdeep penetration (SDP) mode with a SiC-based powder composition. As a result, the thickness of the diffusion layer increases, its porosity decreases, and the proportion of the high-boron FeB phase in the layer increases.

Activation of diffusion during the formation of boride layers on the surface of steel parts

The features of structure formation of diffusion layers obtained by the technology, including preliminary surface treatment of steel products and subsequent thermal diffusion boriding in powder media, have been investigated. Pretreatment consisted in surface activation by superdeep penetration with a powder composition based on SiC of steel samples made of У8 steel. The features of the activation zones and their distribution over the surface are noted. The features of the activation zones and their quantitative characteristics are noted. A structural analysis of the obtained diffusion layers for the variants of low-temperature (650 °C) and high-temperature (920 °C) boration has been carried out. The chemical composition of the layer and the distribution of the main elements in it are analyzed. In both cases, a change in morphology was noted, consisting in the formation of a more compact diffusion layer and rounding of boride needles in the zone adjacent to the base metal. An increase in the layer thickness by 20–50 % and an increase in the proportion of the high-boron FeB phase relative to the variant of borating without preliminary activation were established.

Dynamic alloying of high manganese steel

The option of creating a composite material based on high manganese steel by the method of dynamic alloying in the superdeep penetration mode by flows of powder particles is considered. The dynamic effect of powdered microparticles on a matrix billet transforms the original cast steel into a composite material and leads to a change in mechanical properties.

Conversion of cast carbon steel into composite material

Experimental estimates of the strength properties of a composite material based on carbon steel 45, created by piercing matrix steel in the mode of superdeep penetration by streams of powder particles, have been performed. Pulsed dynamic action by streams of powder particles and subsequent heat treatment converts steel into a fiber composite material.

Superdeep Penetration - Novel Method of Nanoreinforced Composites Producing Based on Metallic, Ceramic and Polymer Matrixes

Now there is a motivation for creation of the materials possessing a considerable difference of physical and chemical properties in volume of composite materials 1 . Composite materials allow realizing a complex of various properties which cannot be realized simultaneously in mono material. The perspective in reception of a new smart nanomaterial is basically defined by possibilities which create processing conditions Choosing and manufacturing of fibers refers to the second stage of composite material reinforcement. Process of assemblage of a composite material from the details made at first two stages of process refers to the third stage. But at each stage of process of manufacturing of a composite material there are specific problems. The basic problem at composite material creation, as a rule, is essential contradictions between engineering solutions for various stages of process.