Comparison of wear behaviour of electrolytic hard chromium coated and nitrided AISI 4140 steels


DANIŞMAN Ş. , SAVAŞ S. , NAİR F.

JOURNAL OF THE BALKAN TRIBOLOGICAL ASSOCIATION, cilt.13, ss.29-37, 2007 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 13 Konu: 1
  • Basım Tarihi: 2007
  • Dergi Adı: JOURNAL OF THE BALKAN TRIBOLOGICAL ASSOCIATION
  • Sayfa Sayıları: ss.29-37

Özet

There are various techniques for improving wear and corrosion resistance of steels by hardening the surface. Two of them are known as electroplating and nitriding. Electroplating is an electrochemical process by which metal is deposited on a substrate by passing a current through the bath, and nitriding involves a case hardening process that depends on the absorption of nitrogen into the steel. In this study, the wear behaviour of electrolytic hard chromium coated and nitrided AISI 4140 steel samples was investigated in pin-on-ring system. Wear experiments were performed in dry sliding and room temperature conditions, and sliding speed and normal load were used as variable parameters. The wear track width on the samples and the average coefficients of friction in steady-state sliding regime were determined. After the tests, the Surface topography of the samples was observed by SEM. According to the test results it was found that hard chromium coated samples showed better wear resistance than nitrided samples.