Surface saturation of steels with carbon during mechanical-pulse treatment

1999 ◽  
Vol 35 (6) ◽  
pp. 853-858 ◽  
Author(s):  
V. I. Kyryliv
Keyword(s):  
Pulse Treatment ◽  
Mechanical Pulse Treatment ◽  
Surface Saturation ◽  
Mechanical Pulse

Fatigue and Corrosion Fatigue of the Roll Steels with Surface Nanostructure

2018 ◽  
Vol 51 ◽  
pp. 92-97 ◽  
Author(s):  
Volodymyr Kyryliv ◽  
Borys Chaikovs'kyi ◽  
Olha Maksymiv ◽  
Borys Mykytchak
Keyword(s):  
Corrosion Fatigue ◽  
Nanocrystalline Structure ◽  
Pulse Treatment ◽  
Surface Nanostructure ◽  
Mechanical Pulse Treatment ◽  
Mechanical Pulse ◽  
Roll Steels

Fatigue and corrosion fatigue of 50KhN and 60Kh2M roll steels with surface nanocrystalline structure induced by mechanical-pulse treatment were studied. The increment of fatigue and corrosion fatigue of the steels with surface nanocrystalline structure were shown and revealed the factors which causes this increment.

Erosion resistance of 40Kh steel after mechanical-pulse treatment

2004 ◽  
Vol 40 (2) ◽  
pp. 296-301 ◽  
Author(s):  
I. V. Hurei ◽  
V. I. Kyryliv ◽  
A. I. Bassarab
Keyword(s):  
Erosion Resistance ◽  
Pulse Treatment ◽  
40Kh Steel ◽  
Mechanical Pulse Treatment ◽  
Mechanical Pulse

Effect of Nanostructurisation of Structural Steels on its Wear Resistance and Hydrogen Embittlement Resistance

2014 ◽  
Vol 225 ◽  
pp. 65-70 ◽  
Author(s):  
Hryhoriy Nykyforchyn ◽  
Volodymyr Kyryliv ◽  
Olga Maksymiv
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Surface Hardness ◽  
Structural Steels ◽  
Matrix Structure ◽  
Pulse Treatment ◽  
Tempering Temperature ◽  
Medium Carbon ◽  
Mechanical Pulse Treatment ◽  
Mechanical Pulse

Surface mechanical pulse treatment of medium-carbon low alloyed steels by high speed friction has been developed. Its major features are surfaces provided with the nanostructure with grain size of 20...50 nm, increased surface hardness and, correspondingly wear resistance. This nanostructure is subjected to the tempering temperature of 500 °С. Hydrogen charging of the strengthening materials decreases their plasticity, more considerably in steels with higher carbon content. However, it is possible to use mechanical pulse treatment to achieve high characteristics of strength, wear resistance and plasticity in hydrogen, selecting as-received matrix structure and the tempering temperature after surface treatment.

A Rare Low Spin Co(IV) Bis-Silyldiamide with High Thermal Stability: Exploring the Origin of an Unusual S = 1/2 Configuration

2020 ◽  
Author(s):  
David Zanders ◽  
Goran Bačić ◽  
Dominique Leckie ◽  
Oluwadamilola Odegbesan ◽  
Jeremy M. Rawson ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Density Functional ◽  
Atomic Layer ◽  
Epr Spectrum ◽  
Functional Theory ◽  
Cluster Calculations ◽  
Layer Deposition ◽  
Starting Point ◽  
Higher Spin ◽  
Surface Saturation

Attempted preparation of a chelated Co(II) β-silylamide re-sulted in the unprecedented disproportionation to Co(0) and a spirocyclic cobalt(IV) bis(β-silyldiamide): [Co[(NtBu)2SiMe2]2] (1). Compound 1 exhibits a room temperature magnetic moment of 1.8 B.M and a solid state axial EPR spectrum diagnostic of a rare S = 1/2 configuration. Semicanonical coupled-cluster calculations (DLPNO-CCSD(T)) revealed the doublet state was clearly preferred (–27 kcal/mol) over higher spin configurations for which density functional theory (DFT) showed no energetic preference. Unlike other Co(IV) complexes, 1 had remarkable thermal stability, and was demonstrated to form a stable self-limiting monolayer in initial atomic layer deposition (ALD) surface saturation tests. The ease of synthesis and high-stability make 1 an attractive starting point to begin investigating otherwise inaccessible Co(IV) intermediates and synthesizing new materials.

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