Surface alloying of steels in the process of mechanical pulse treatment

1998 ◽  
Vol 34 (3) ◽  
pp. 416-419 ◽  
Author(s):  
V. I. Kyryliv
Keyword(s):  
Pulse Treatment ◽  
Surface Alloying ◽  
Mechanical Pulse Treatment ◽  
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.

Microstructures of Laser Processed Fe-Cr Surface Alloys

1981 ◽  
Vol 39 ◽  
pp. 328-329
Author(s):  
P. A. Molian ◽  
K. H. Khan ◽  
W. E. Wood
Keyword(s):  
Cooling Rate ◽  
Pure Iron ◽  
Continuous Wave ◽  
Laser Surface ◽  
Material Surface ◽  
Constitution Diagram ◽  
Incident Power ◽  
Surface Alloying ◽  
Laser Surface Alloying ◽  
Spot Diameter

In recent years, the effects of chromium on the transformation characteristics of pure iron and the structures produced thereby have been extensively studied as a function of cooling rate. In this paper, we present TEM observations made on specimens of Fe-10% Cr and Fe-20% Cr alloys produced through laser surface alloying process with an estimated cooling rate of 8.8 x 104°C/sec. These two chromium levels were selected in order to study their phase transformation characteristics which are dissimilar in the two cases as predicted by the constitution diagram. Pure iron (C<0.01%, Si<0.01%, Mn<0.01%, S=0.003%, P=0.008%) was electrodeposited with chromium to the thicknesses of 40 and 70μm and then vacuum degassed at 400°F to remove the hydrogen formed during electroplating. Laser surface alloying of chromium into the iron substrate was then performed employing a continuous wave CO2 laser operated at an incident power of 1200 watts. The laser beam, defocussed to a spot diameter of 0.25mm, scanned the material surface at a rate of 30mm/sec, (70 ipm).

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