Microstructural analysis of EN-GJS-450-10 ductile cast iron via vibrational casting

YÜKSEL Ç.

China Foundry, cilt.17, sa.4, ss.272-278, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 17 Sayı: 4
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s41230-020-0058-7
  • Dergi Adı: China Foundry
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, Metadex, Directory of Open Access Journals, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.272-278
  • Anahtar Kelimeler: mechanical vibration, spheroidal cast iron, ductile iron, nodularity, image analysis, amplitude, TG146, 21, A, MECHANICAL-PROPERTIES, GRAIN-REFINEMENT, GRAPHITE NODULES, SOLIDIFICATION
  • Atatürk Üniversitesi Adresli: Evet

Özet

EN-GJS-450-10 ductile cast iron was produced with and without vibration to evaluate microstructural features. To investigate the effect of vibration, a reference, and two different castings having amplitudes of 0.9 mm and 1.8 mm were cast with a fixed vibration frequency of 50 Hz. The nodule count (density), form (type), size distribution, nodularity, and the fraction of graphite, percentages of both ferrite and pearlite phases, length of ferrite shell, and pore, were evaluated via optical microscopy using an image analysis software. It is observed that the microstructure of the cast iron is more uniform by vibrational casting than that by non-vibrational casting. Additionally, mechanical vibration enhances nodule count and nodularity, also, more ferritic matrix could be obtained after the application of vibration. Nodule count and nodularity of vibrational casting with 1.8 mm amplitude increased from 226 nodule per mm(2)and 80% to 311 nodule per mm(2)and 86.5% of non-vibrational casting. Percentages of ferrite and graphite area dramatically improved from 24% and 16.5% for non-vibrational casting to 57% and 22.3% for vibrational casting with 1.8 mm amplitude, whereas the percentages of pearlite and pores decreased significantly from 56.1% and 5% to 20% and 1%, respectively.