Developing Ultra-High Strength Bainitic Steel by Hot Stamping Process and Anisothermal Holding

ERİŞİR E., Barutçuoğlu B., BİLİR O. G., Uzunboy M., ZEREN M.

Steel Research International, 2024 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1002/srin.202400259
  • Dergi Adı: Steel Research International
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: bainite, bainitic steel, hot stamping, mechanical properties, phase transformations
  • Kocaeli Üniversitesi Adresli: Evet

Özet

Hot stamping is a well-established process in the automotive industry for structural parts to decrease the weight of a vehicle without reducing the safety and stiffness of components. In this work, a bainitic approach during the hot stamping process is studied by anisothermal annealing. The effect of different strategies on the microstructure and mechanical properties of the hot-stamped parts is investigated. The microstructure is analyzed using light microscopy (LM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD) techniques. Tensile and hardness tests are applied to analyze mechanical properties. A microstructure consisting of a carbide-free bainite matrix containing martensite, fine-grained ferrite, and retained austenite is obtained. SEM analysis of fracture surfaces from tensile samples reveals that the bainitic microstructure showed mainly a ductile fracture by dimples and voids along with some quasi-cleavage fracture.