Influence of mechanical and thermal treatments on microstructural transformations in cast irons and properties of synthesized diamond crystals

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Authors:

V. V. Sobolev, orcid.org/0000-0003-1351-6674, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S. I. Gubenko, orcid.org/0000-0001-6626-3979, National Metallurgical Academy of Ukraine, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

D. V. Rudakov, orcid.org/0000-0001-7878-8692, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O. L. Kyrychenko, orcid.org/0000-0002-1331-9323, State Enterprise “Research-Industrial Complex “Pavlohrad Chemical Plant”, Pavlohrad, Dniproperovsk Region, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O. O. Balakin, orcid.org/0000-0003-2003-0381, State Enterprise “Research-Industrial Complex “Pavlohrad Chemical Plant”, Pavlohrad, Dniproperovsk Region, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (4): 053-062

https://doi.org/10.33271/nvngu/2020-4/053

повний текст / full article

 

Abstract:

Purpose. To analyze how the structural transformations in the cast iron metal matrix near graphite inclusions influence the features of synthesis of metastable diamond crystal on diamond polycrystals (substrate) synthesized by shock-waves.

Methodology. In experiments, we used the laser-induced detonation of explosive charges to create a flat shock-wave front and employed chemical, microstructural, spectral and X-ray phase analyzes. In particular, the features of chemical element distribution in cast iron phases, dislocation density in a solid solution, crystal lattice parameters, and others were studied.

Findings. It has been shown that solid-phase auto-epitaxy is a physically justified, experimentally proved and stably reproducible phenomenon. The accelerated transfer of carbon atoms to the surfaces of metastable diamond growing crystals in the kinetic mode is facilitated by a number of factors that cannot be quantified by numerically evaluated parameters. These include, first of all, the microstructure of the growing medium (cast iron matrix), carbon source, temperature and deformation fields that ensure transformation of polymorphic graphite to diamond with emerging gradient stress fields at the stages of forging, exposure to shock waves and thermal cycling. Defect redistribution in the crystal structure of the metal matrix and graphite inclusions plays a certain role at the mesoscale. It has been found that saturation with microstructural defects brings higher physicochemical activity to the system in the whole.

Originality. For the first time in world practice, diamond single crystals have been synthesized that contain the inclusions of polycrystalline diamond particles of shock-wave origin inside the single crystal shell; this may indicate a general discreteness of natural diamond formation.

Practical value. The growth of single metastable crystal on polycrystalline diamond of shock wave synthesis is the most favorable in case of using austenitic gray cast iron with foliate graphite inclusions. The experimentally proved diamond growth in a solid medium under pressure and temperature within the range of graphite stability can be used to develop new low-energy technologies for the synthesis of metastable diamond single crystals.

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