Reporter: Stavertiy A.Y., chief engineerMoscow Center of Laser Technologies

Moscow, 2013

Types of composite materialsTypes of composite materials

-continuous fiber-reinforced

-short fiber-reinforced

-particle-reinforced2

Methods of obtaining parts from composite material

Spray Forming

Hot isostatic pressing (HIP)

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Creation of products and coatings of nanostructured composite materials using laser melting of powder

materials

Part of titanium alloy Тi6Al4V received by additive method of laser processing

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coaxial nozzle

gas-powder cone

laser beam

melted material

cladded material

Metal matrix: steel 14ХН3МА

Phase-hardener: titanium carbide TiC

Chromium Nickel Molybdenum steelCase-hardened steel (high surface hardness 700-750 HV) is applied to manufacturing of gear wheels, shafts, worms and other case hardening of parts operating under the influence of shock loadings

Used for the manufacture of parts and tools, working in conditions of intensive wear in corrosive environments at high temperatures.

-increased durability -increased fatigue strength

- low density high modulus of elasticity - high hardness - high thermal stability - resistance against oxidation - comparable to steel coefficient of linear thermal expansion

Reduction of the weight of material steel/TiC depending on the content of TiC

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Technological map of the process of direct laser deposition*

Development of technological process map

*Material: 14XН3MA/TiC (85/15% vol.)

The total thickness of the layer exceeds the height of the single clad by 15-30% depending on the step between tracks

The thickness of the layer is stabilized with the height of the sample and depends on the type of material

Single clad

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Cladded layer

The structure of composite 14ХН3МА/TiC (66/34% vol.)

Different types of microstructures in the composite material of 14ХН3МА/TiC (66/34% vol.)

1 – undissolved particles added TiC2 – fine particles TiC of cubic, dendrite and needle shape released in grain and on its borders3 – fine particles TiC of needle and dotted shape released on the limits of grain

Features of microstructure of composite material

Microstructure:

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1 2 3 4

Cross-strategy Unrossed-strategy

The anisotropy of the properties of composite materials based on the strategy of its creation

σпр σт δ

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The General results and conclusions

1.An additive laser technology of production of parts made of composite

material on the basis of steel and titanium carbide has been developed. Have been

obtained samples of composite materials with a content of a hardening of the

carbide phase to 34%, with sizes up to 50x75x50 mm3.

2.Samples of steel, made of cross-strategy of application, have isotropic

properties. Limits of fluidity and strength are at the level of cast material. However,

the elongation may vary depending on the strategy of cladding.

3.The technological process maps of direct laser manufacture of bulk samples

with a certain structure, a given geometry and high capacity use (factor powder

material up to 90%) have been prodused.

4.The mechanisms of interaction of the carbide phase and metal matrix,

characterised for laser processing method, have been discovered.

5.The resulting composite material, not conceding on indicators of surface

hardness, but has reduced by 1-10% mass perspective as the replacement of

traditional steel 14ХН3МА for details of special purpose, working in conditions of

intensive wear at high temperatures.

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Thank you for your attention!