Fatigue and Corrosion Fatigue of the Roll Steels with Surface Nanostructure

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.

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

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.