Potentialities of carbonitrides as the hard constituent of sintered hard alloys

Bilyk, I. I.

doi:10.1007/bf00797922

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…On one side, if we compare the carbides variants (which are comparable to their carbonitrides counterpart), we find that TiC has only one active slip system ሼ110ሽ 〈11 ത 0〉 [14] at low temperatures in contrast to ZrC which has two active slip systems active at room temperature ሼ001ሽ 〈110〉 and ሼ11 ത 0ሽ 〈110〉 [27]. On the other side, mechanical properties of TMCN are intrinsically related to the electronic structure formed by the ternary compound (Transition Metal, Carbon and Nitrogen), an assumption which was supported earlier by Bilyk [4]. The nature and relative strengths of metal-metal and metal-carbon/nitrogen bonds change with the…”

Section: Calculation Of Geometrically Necessary Dislocation (Gnd) Frosupporting

confidence: 83%

“…The present study deals with micro-mechanical investigations of transition metal Zirconium and Titanium carbonitrides (Zr(C,N) and Ti(C,N) respectively) coatings deposited by chemical vapor deposition (CVD) on WC-Co cemented carbide. They both have good combination of high hardness and adequate toughness [4] and comparable physical properties [5,6]. However, they present different performances during metal cutting applications [7].…”

Section: Introductionmentioning

confidence: 99%

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Investigations on micro-mechanical properties of polycrystalline Ti(C,N) and Zr(C,N) coatings

et al. 2018

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Hard and wear resistant coatings are widely used as tribological layers to protect tools from wear, oxidation and corrosion. Characterizing the deformation behavior of coatings is essential for understanding wear mechanisms and to design multi-layered coatings that withstand severe working conditions. Micro-mechanical properties of Ti(C,N) and Zr(C,N) coatings deposited by chemical vapor deposition on a WC-Co cemented carbide substrate were examined by micro-compression testing using a nanoindenter equipped with a flat punch. Scanning Electron Microscopy, Focused Ion Beam, Electron Backscattered Diffraction and Finite Element Modeling were combined to analyze the deformation mechanisms of the carbonitride layers at room temperature. The results revealed that Ti(C,N) undergoes

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Section: Calculation Of Geometrically Necessary Dislocation (Gnd) Frosupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Investigations on micro-mechanical properties of polycrystalline Ti(C,N) and Zr(C,N) coatings

et al. 2018

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“…In short, for the ZrC-ZrN alloys, the following main experimental data were obtained: (i) the lattice parameter of these alloys is a linear function of composition between the carbide and nitride [5]; (ii) there is no ambiguity in determining microand nanohardness (H ) of zirconium carbonitride as functions of composition. Results on well-characterized specimens [6] show that the hardness of ZrC x N 1−x increases monotonically with x, whereas other results on ZrC-ZrN alloys [7] exhibit a maximum of H at a valence-electron concentration per cell (VEC) of about 8.4; (iii) the bulk modulus (B) shows a slight negative deviation from the mixing rule B(x) = x B ZrC + (1 − x)B ZrN [6] and (iv) the shear (G) and Young (E) moduli exhibit a slight maximum for x ∼ 0.7 (VEC ∼ 8.3) [6].…”

Section: Introductionmentioning

confidence: 77%

First-principles study of elastic and stability properties of ZrC–ZrN and ZrC–TiC alloys

Иващенко

Turchi

Шевченко

2009

J. Phys.: Condens. Matter

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Ab initio calculations of the elastic constants for several cubic ordered structures of zirconium carbonitride (ZrC(x)N(1-x)) and zirconium-titanium carbide (Zr(x)Ti(1-x)C) alloys were carried out. The calculations of total and formation energies, bulk modulus and elastic constants as functions of composition were performed with an ab initio pseudo-potential method. The predicted equilibrium lattice parameters are slightly higher than those found experimentally (on average by 0.2-0.4%). The predicted formation energies indicate that the ZrC(x)N(1-x) alloys are stable even at 0 K in the whole concentration range, while the homogeneous Zr(x)Ti(1-x)C alloys can be stabilized only at high temperatures. Spinodal decomposition of the latter alloys into cubic domains takes place over a wide range of compositions and temperatures. For the carbonitrides, the shear modulus G, the Young's modulus E and the Poisson ratio σ reach an extremum for carbon-rich alloys, and this is attributed to a maximum value of the shear modulus C(44) that corresponds to a valence-electron concentration in the range of 8.2-8.3. This extremal behavior finds its origin in the response of the band structure of ZrC(x)N(1-x) alloys for 0≤x≤1, caused by the monoclinic strain that determines this shear modulus. In contrast, the other shear modulus [Formula: see text] does not exhibit any extremum over the whole composition range. These results are in contrast with those for Zr-Ti carbides for which the elastic properties gradually increase from ZrC to TiC.

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“…The compression modes of the obtained powder mixture are also selected experimentally and are determined by the loading rate, the final pressure, the holding time and the relieving rate. According to the data of operation [6], when pressing a mixture of powders consisting of 50% titanium carbide and 50% alloyed steel, the optimal pressure is 2 t/cm 2 . The properties of the compacts also depend on the kind of plasticizer introduced into the charge.…”

Section: Theoretical Provisionsmentioning

confidence: 99%

“…Preliminary sintering of carbide carcass is performed in vacuum at Pres = 10 -4 mmHg [8] or in protective medium [6]. The sintering temperature of the carbide composition plays an important role in forming the structure of the article during impregnation.…”

Section: Theoretical Provisionsmentioning

confidence: 99%

Preparation of Carbidostals

Savinykh

Dudorova

2022

KEM

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The article discusses a powdered material - carbidostal. Comparative characteristics of carbidostals, tool steels are given and hard alloys. Methods of producing and producing carbidostals are considered. Conditions for free separation of residues of impregnating material from the surface of the article are established. The reasons of volumetric change of amount of carbides and binding by height of impregnated press are studied.

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Potentialities of carbonitrides as the hard constituent of sintered hard alloys

Cited by 6 publications

References 6 publications

Investigations on micro-mechanical properties of polycrystalline Ti(C,N) and Zr(C,N) coatings

Investigations on micro-mechanical properties of polycrystalline Ti(C,N) and Zr(C,N) coatings

First-principles study of elastic and stability properties of ZrC–ZrN and ZrC–TiC alloys

Preparation of Carbidostals

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