Partial austenitisation and TBF steel composed of ferrite, bainitic ferrite, and austenite

ERİŞİR E., BİLİR O. G., Sozer Y. E., ARARAT Ö., Davut K.

MATERIALS SCIENCE AND TECHNOLOGY, cilt.39, sa.1, ss.105-116, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 39 Sayı: 1
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1080/02670836.2022.2102289
  • Dergi Adı: MATERIALS SCIENCE AND TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.105-116
  • Anahtar Kelimeler: TBF steels, partial austenitisation, phase transformations, microstructural characterisation, mechanical properties, MECHANICAL-PROPERTIES, STRENGTH, MICROSTRUCTURE, MARTENSITE, FORMABILITY, DUCTILITY, EBSD, NB, ALUMINUM
  • Kocaeli Üniversitesi Adresli: Evet

Özet

A TRIP-aided bainitic-ferritic (TBF) steel with a chemical composition of Fe-0.19C-1.7Mn-1.09Si-0.51Al-0.05Nb (wt-%) was partially austenitised from a hot-rolled martensitic initial microstructure. After the hot rolling, the martensitic specimens were reheated to different intercritical temperatures and then austempered at 350 degrees C. Thus, the effect of the initial microstructure of TBF steel on intercritical austenite formation during partial austenitisation was studied. The microstructures were investigated by scanning electron microscopy and electron backscatter diffraction (EBSD), and the tensile properties were tested. Microstructural observations revealed that a final microstructure of fine ferrite, bainitic ferrite, and retained austenite can be obtained. The steel partial austenitised at 770 degrees C showed a good combination of ultimate tensile strength and total elongation.