An experimental and modelling study on pulse current integrated CRTD-Bor process

Arslan Kaba M., Karimzadehkhoei M., Keddam M., Timur S. İ., Kartal Şireli G.

Materials Chemistry and Physics, vol.302, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 302
  • Publication Date: 2023
  • Doi Number: 10.1016/j.matchemphys.2023.127735
  • Journal Name: Materials Chemistry and Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Average diffusion coefficient (ADC), Boriding, CRTD-Bor, Pulse current
  • Istanbul Technical University Affiliated: Yes


In this study, pulse current integrated cathodic reduction and thermal diffusion-based boriding (PC/CRTD-Bor) process was applied to low carbon steels to grow industrially preferred single phase Fe2B layers in short durations (<1 h). For this purpose, the determination of combined effects of duty cycle and current density were examined at two sets of experiments as follows: (I) Duty cycle investigations where the specimens were borided at the constant current density of 200 mA/cm2 for different duty cycles (i.e., 1/8 - 1 s reduction & 7 s diffusion to 1/2 - 1 s reduction & 1 s diffusion) and (II) current density investigations where boriding trials were carried out at the constant duty cycle of 1/4 for different current densities (e.g., 50 mA/cm2 to 700 mA/cm2). Cross-sectional scanning electron microscope inspections along with X-ray diffraction analyses revealed that it is possible to grow a 20 μm thick Fe2B layer in 30 min at the condition of 1/4 duty cycle, 200 mA/cm2 current density and 950 °C. Additionally, the average diffusion coefficient model calculations were done which gave a good correlation with experimental results.