Microstructure and Properties of Nanoduplex Bainite-Austenite Steel for Ultra-High-Strength Plates

Basing on experimentally determined continuous cooling transformation (CCT) and time–temperature–transformation (TTT) diagrams, examination of microstructure by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X‐ray diffraction (XRD) techniques and measurements of mech...

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Bibliographic Details
Published in:Steel research international 2014-12, Vol.85 (12), p.1620-1628
Main Authors: Garbarz, Bogdan, Burian, Wojciech
Format: Article
Language:English
Subjects:
Austenitic stainless steel
Cooling
Mechanical properties
Microstructure
Nanostructure
nanostructured bainite
phase transformations
Plates
Scanning electron microscopy
Steels
Tensile strength
Transformations
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Summary:Basing on experimentally determined continuous cooling transformation (CCT) and time–temperature–transformation (TTT) diagrams, examination of microstructure by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X‐ray diffraction (XRD) techniques and measurements of mechanical properties an optimized chemical composition of a nanostructured bainite–austenite steel intended for production of plates is proposed. The optimized composition enables to manufacture ultra‐high‐strength plates up to 15 mm in thickness at relatively low cost of alloying elements and with characteristics facilitating industrial production. Experimental flat bars manufactured in semi‐industrial conditions of the developed steel containing 0.56% C, 2.00% Mn, 1.76% Si, 1.29% Cr, and 0.76% Mo after transformation at 225°C for 60–72 h show good combination of mechanical properties: ultimate tensile strength over 1.9 GPa, yield strength in the range of 1.3–1.4 GPa, total elongation about 15% and hardness at the level of 600 HV. Basing on experimentally determined continuous cooling transformation (CCT) and time–temperature–transformation (TTT) diagrams, measurements of mechanical properties and examination of microstructure an optimized chemical composition of a nanostructured bainite–austenite steel intended for production of plates is proposed. The optimized composition enables to manufacture ultra‐high‐strength plates up to 15 mm in thickness.
ISSN:1611-3683
1869-344X
DOI:10.1002/srin.201300453