EFFECT OF LOAD, ROTATION SPEED AND SLIP RATIO ON THE WEAR BEHAVIOUR OF PVD-COATED HOTVAR STEEL UNDER LUBRICATING CONDITIONS

Gerçekcioğlu E., Dağaşan Bulucu E., Kaleli E. H., Ars Tuğral F.

Journal Of The Balkan Tribological Association, cilt.18, sa.1, ss.69-79, 2012 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 18 Sayı: 1
  • Basım Tarihi: 2012
  • Dergi Adı: Journal Of The Balkan Tribological Association
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.69-79
  • Erciyes Üniversitesi Adresli: Evet

Özet


in this study, the effect of load and rotation speed on wear behaviour of the
HOTvAR (Hot work) steel was investigated under lubricated abrasive conditions. The specimens were coated with titanium nitride (TiN) by physical
vapour deposition (PvD) method on a small part of the heat-treated surface.
coating method was only applied to the ridge parts of the HOTvAR steel specimens. Average thickness of the TiN layer was determined as 1.89 µm. Disc–
disc configuration was used during the wear tests. To determine the effect of
load and rotation speed, the tests were carried out in 4 different loads and rotation speeds. As a result, it was observed that the mass loss values of the heattreated specimen increase more than of the coated specimens, because there is
an increasing effect of coating process on the hardness value of the specimens
as the load increases. similar to these mass loss results, roughness average (Ra)
values of both specimens are close to each other in initial low load values, but
later on the load value of 125 N, partial increases are observed. When the load
increases to 175 N, Ra values of both specimens decrease and become similar.
This is well explained by depletion of TiN layer during abrasive wear.