Loading...

Impact properties of tempered bainite-ferrite dual phase steels

Saeidi, N ; Sharif University of Technology | 2010

1468 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2010.05.015
  3. Publisher: 2010
  4. Abstract:
  5. To improve both strength and toughness of AISI 4340 steel three microstructures, full bainite, bainite-ferrite and tempered bainite-ferrite, were produced by heat treatment of this steel. Tensile, impact and hardness properties of these microstructures were compared. The results showed that with tempering of bainite-34% ferrite dual phase steel, elongation and charpy impact energy increased significantly in comparison to bainite and bainite-ferrite microstructures. Also ductile-brittle transition temperatures of bainite-ferrite and tempered bainite-ferrite steels were measured and confirmed superior toughness properties of this microstructure. Fracture surface analysis of charpy specimens also showed increase in toughness of tempered bainite-ferrite in comparison to bainite-ferrite and full bainite microstructures. Radial marks, shear lip areas and crack initiation site region in fracture surfaces of three mentioned microstructures were also considered and compared
  6. Keywords:
  7. Charpy impact energy ; AISI 4340 steel ; Charpy impact energy ; Charpy specimen ; Crack initiation sites ; Dual-phase steel ; Ductile-brittle transition temperature ; Ferrite steel ; Fracture surface analysis ; Fracture surfaces ; Impact property ; Shear lip ; Strength and toughness ; Tempered bainite-ferrite ; Toughness properties ; Cracks ; Fatigue crack propagation ; Ferrite ; Fracture ; Hydrogen embrittlement ; Microstructure ; Surface analysis ; Tensile strength ; Bainite
  8. Source: Materials Science and Engineering A ; Volume 527, Issue 21-22 , August , 2010 , Pages 5575-5581 ; 09215093 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0921509310005277