Effect of process time on structural and tribological properties of ferritic plasma nitrocarburized AISI 4140 steel

Karakan M., ALSARAN A., Celik A.

MATERIALS & DESIGN, cilt.25, sa.4, ss.349-353, 2004 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 25 Sayı: 4
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1016/j.matdes.2003.10.017
  • Dergi Adı: MATERIALS & DESIGN
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.349-353
  • Anahtar Kelimeler: plasma, nitrocarburizing, process time, BEHAVIOR, LAYERS
  • Atatürk Üniversitesi Adresli: Evet

Özet

AN 4140 steel was plasma nitrocarburized at a gas mixture of 49%N-2 + 49%H-2 + 2%CO2, for different process times (1, 2, 4, 8 and 12 h), at a temperature of 570degreesC. The structural, mechanical and tribological properties of nitrocarburized steel were analyzed using a X-ray diffraction, microhardness tester, scanning electron microscopy, optical microscopy and pin-on-disk tribotester. The results have shown that the compound layer was composed of the epsilon and gamma' iron carbonitrides. In addition, the compound layer included pores having a columnar structure. These pores are open to the surface. The nitrocarburizing process increases surface hardness, roughness and friction coefficient. The wear rate improves after plasma nitrocarburizing, and decreases with increasing surface hardness. (C) 2003 Elsevier Ltd. All rights reserved.