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2 1998

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Residual stresses in nitrided layers on titanium alloys produced under glow discharge conditions.

Wierzchoń T., Major B., Wołczyński W.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1007-1010

Plasma nitriding treatment of titanium alloys is performed to improve the frictional wear and corrosion resistance. Titanium alloys OT4-0 were treated at various temperatures. The X-ray diffraction phase analysis revealed the TiN, Ti2N and TiN0.30 phases in the surface layers when the process was completed. Respective relations between the identified phases varied slightly in respect to the process conditions. The X-ray square sin psi method was used to measure residual stresses within the surface layers of examined alloys subjected formerly to the plasma nitriding. Calculations of the residual stresses were carried out mainly for the TiN phase on the basis of the 311 diffraction line. The level of residual stresses was within the range of about -2.2 to -3.2 GPa in respect to the applied experimental nitriding conditions for measurements of the front surface. Measurements performed for the back surface revealed diminishing of the stress level of about -1.8 to -2.8 GPa, respectively. An attempt was made to estimate residual stresses in the other constituent phases i.e. Ti2N and TiN0.30, the values for the TiN were used in calculations. The obtained results presented also the compresive residual stresses of order -1.6 to -2.4 GPa for the Ti2N and -1.4 to 2.0 GPa for the TiN0.30. Increase of resistance to corrosion and to frictional wear was stated in the plasma nitrided materials.

Hydrogen's interaction with hardened surface layers in dry and lubricated frictional couples.

Kula P., Pietrasik R.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1085-1091

In the present work the resistance against wear of various hardened layers is analysed in exploitation's conditions which include the generation of hydrogen ions and atoms in the frictional contact as a result of tribochemical and tribothermal processes. The mentioned above analyse has been carried out on the base of experimental data obtained by simulation of exploitation's conditions in stand investigations and tribological tests. Also, it has been confirmed by the results of field wear studies of real car hanging and train brakes parts. In the light of obtained results the well-known low-friction behaviour of nitrided like layers are explained by the fenomen of 'self-lubrication with hydrogen' as well as the influence of hydrogen on the forming of oil's boundary film on nitrided surfaces is confirmed and discussed.