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Microstructure-toughness relationship in AISI4340 steel

Saeidi, N ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.4028/www.scientific.net/DDF.312-315.110
  3. Abstract:
  4. To improve the strength and toughness of AISI 4340 steel, different microstructures, containing full bainite, bainite-ferrite, martensite-ferrite and full martensite were produced by different heat treatment cycles. Tensile, impact and hardness tests were carried out at room temperature. The ductile-brittle transition temperature was determined from impact data at different temperatures. The results showed that steel with bainite - 0.34 ferrite microstructure has the highest elongation and charpy impact energy, while its tensile strength and yield stress decreased in comparison to other microstructures. This increment was noticeable when bainite - 0.34 ferrite steel was tempered. The ductile-brittle transition temperature decreased with tempering of bainite -0.34 steel. The fracture surface analysis of charpy specimens also showed an increase in toughness of tempered bainite-ferrite in comparison to other microstructures
  5. Keywords:
  6. Ferrite ; Impact energy ; Martensite ; Microstructure ; Tensile strength ; Toughness ; AISI 4340 steel ; Charpy impact energy ; Charpy specimen ; Ductile-brittle transition temperature ; Ferrite steel ; Hardness test ; Heat treatment cycle ; Impact data ; Room temperature ; Strength and toughness ; Tempered bainite ferrites ; Fracture surface analysis ; Bainite ; Diffusion in solids ; Ferrites ; Hardness testing ; Surface analysis ; Temperature ; Yield stress ; Martensitic steel ; Surface analysis
  7. Source: Defect and Diffusion Forum ; Volume 312-315 , 2011 , Pages 110-115 ; 10120386 (ISSN) ; 9783037851173 (ISBN)
  8. URL: http://www.scientific.net/DDF.312-315.110