Ivan Goncharov

Politecnico di Milano | Polimi · Department of Mechanical Engineering

This study investigates the influence of different sinter-HIP temperatures and binder saturation levels on the microstructure and properties of WC-12Co cemented carbide, produced using binder jetting. The sinter-HIP process was performed at 1400 • C, 1460 • C, and 1500 • C and binder saturation levels of 60% and 75% were selected during printing. T...

In this paper, the Ti25Zr25Ni25Co10Cu15 high entropy alloy has been investigated. A novel approach to manufacture high-temperature shape memory alloys is proposed. A fundamental possibility to obtain compact samples by powder bed fusion using a laser beam (PBF-LB) from Ti25Zr25Ni25Co10Cu15 powder obtained by mechanical alloying and plasma spheroidi...

In this paper, the synthesis of a high-entropy Ti-Zr-Hf-Ni-Co-Cu alloy (HEA) by powder metallurgy (PM) methods was investigated. This alloy is prospective from high-temperature shape memory effect point of view. The composition of (TiZrHf)50Ni25Co10Cu15 was chosen for the study as it promised to show high functional properties. In order to synthesi...

A study was carried out to investigate the influence of the initial powder features on the microstructure, the phase composition, and on the mechanical properties of WC-12%Co samples produced by binder jetting and densified by sintering in vacuum at 1400 °C and by sinter-HIPing. The initial powder consisted of a mixture of fine-grained and coarse-g...

The paper presents the results of the investigation into the manufacturing of spherical powder from machining chips of heat-resistant Fe-11Cr-1.5Ni-0.2V-0.4Mo-0.1C steel. The obtained powder was used to manufacture bulk samples by additive manufacturing methods (SLM and DED). A comparative analysis of the chemical composition and mechanical charact...

In this paper, laser powder-bed fusion (L-PBF) additive manufacturing (AM) with a high-temperature inductive platform preheating was used to fabricate intermetallic TiAl-alloy samples. The gas atomized (GA) and mechanically alloyed plasma spheroidized (MAPS) powders of the Ti-48Al-2Cr-2Nb (at. %) alloy were used as the feedstock material. The effec...

This paper presents the results obtained in comparative grinding studies of alloy metal chips using a ball mill and a vibrating mill. A comparison of the effective viscosity, bulk and tapped density in narrow size classes demonstrated higher rheological properties of the vibration grinding product and significant differences in the distribution of...

In this work, Laser powder bed fusion (L-PBF) Additive Manufacturing with a high-temperature platform preheating was used to fabricate Ti2AlNb-based alloy samples. The Ti-22Al-22Nb-0.1Mo-0.3Hf-0.3Ta-1.5Zr-0.8Si-0.9Fe (at. %) powder obtained by mechanical alloying followed by plasma spheroidization as well as the Ti-24Al-25Nb-1Zr-1.4V-0.6Mo-0.3Si (a...

Mechanical alloying with subsequent plasma spheroidization is a novel technological route to produce the new powder materials for additive manufacturing technologies, such as selective laser melting and direct laser fabrication. Nb-25Ti-2Cr-2Al-2Fe-16Si (at.%) powder synthesized by mechanical alloying and plasma spheroidization. The spheroidized po...

The Nb-Si in-situ composite samples were fabricated by laser metal deposition additive manufacturing technology from mechanically alloyed powders in vario-planetary ball mill. A laser metal of samples was carried out at various laser powers: 500 W, 1000 W, 1400 W. The microstructure of a sample grown at a laser power of 500 W consists of a solid so...

Synthesis of the Nb-Si in-situ composite was attempted by mechanical alloying of element powders in vario-planetary ball mill. The particles size distribution was measured by laser diffraction, microstructures were examined with scanning electronic microscope, and the phase constituent were analyzed by X-ray diffraction. The amorphization of the Si...

Synthesis of the Nb-Si in-situ composite was attempted by binder jetting additive manufacturing technology, using Nb powder and liquid Si during infiltration in furnace. The microstructures were examined with scanning electronic microscope, and the phase constituent were analyzed by X-ray diffraction. Furthermore, the effect of using prepared Nb-16...

The Nb-Si in-situ composite was synthesized by binder jetting additive manufacturing technology. The Nb powder was used as the raw material. The green model was printed with binder in a layer-by-layer way and then infiltrated with liquid Si during in furnace. The microstructure consists of NbSi2 and excess silicon. To control the Si content a mixtu...

During the spheroidization process of the heat-resistant alloy powder 3X11H2B2MF nanoparticles appears on its surface which can lead the influence on the microstructure and mechanical properties when manufacturing the parts. The paper presents the results of the microstructure study and mechanical tests of the specimens manufactured by directed ene...

The powder of Nb-25Ti-2Cr-2Al-16Si (at%) was obtained by mechanical alloying and plasma spheroidization from elemental powders. The building was performed by SLM 280HL machine on the titanium substrate. The microstructure was analyzed by MIRA Tescan scanning electronic microscope. The XRD was performed by BRUKER D8. The microstructure consists of N...

Results of a study of the production of spherical-shape powder from shavings of high-alloy high-temperature steel 13Kh11N2V2MF (ÉI961) are presented. It is shown that the rate of feeding of the powder into the flow of thermal plasma affects the process of spheroidization of the particles. The chemical composition of the powder is compared to that r...

In this paper, Nb-25Ti-2Cr-2Al-16Si (at.%) powder was fabricated by mechanical alloying and plasma spheroidization processes. At the 300 min of milling in attritor, a uniform distribution of chemical elements can be obtained. Further increasing of milling time leads to drastically increase of the Fe contamination from grinding media. After plasma s...

The development of new, more refractory heat-resistant materials for gas-turbine engines is one of most important problems of modern materials science. This is associated with the fact that nickel superalloys currently used for this purpose have a lower melting point of ~1400°C, which limits their own maximal working temperature by a range of 1100–...

The mechanical properties and the impact toughness of austenitic 316L steel produced by selective laser melting at a laser power of 175–190 W have been studied. It is shown that the selective laser melting method makes it possible to significantly increase the strength properties of the steel with some decrease in the ductility and the impact tough...