A NOVEL METHOD FOR IMPROVING PLASMA NITRIDING EFFICIENCY: PRE-MAGNETIZATION BY DC MAGNETIC FIELD

KOVACI H., Yetim A. F., BOZKURT Y. B., ÇELİK A.

SURFACE REVIEW AND LETTERS, cilt.24, sa.1, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 24 Sayı: 1
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1142/s0218625x17500056
  • Dergi Adı: SURFACE REVIEW AND LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Plasma nitriding, magnetic field, magnetization, pre-magnetization, ferromagnetic material, AISI 4140 STEEL, AUSTENITIC STAINLESS-STEEL, FERROMAGNETIC STEEL, WEAR PROPERTIES, BEHAVIOR
  • Atatürk Üniversitesi Adresli: Evet

Özet

In this study, a novel pre-magnetization process, which enables easy diffusion of nitrogen, was used to enhance plasma nitriding efficiency. Firstly, magnetic fields with intensities of 1500G and 2500G were applied to the untreated samples before nitriding. After the pre-magnetization, the untreated and pre-magnetized samples were plasma nitrided for 4 h in a gas mixture of 50% N-2-50% H-2 at 500 degrees C and 600 degrees C. The structural, mechanical and morphological properties of samples were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness tester and surface tension meter. It was observed that pre-magnetization increased the surface energy of the samples. Therefore, both compound and diffusion layer thicknesses increased with pre-magnetization process before nitriding treatment. As modified layer thickness increased, higher surface hardness values were obtained.