Mechanical Properties Dependence on Microstructures of Hot Rolled 3 ʳᵈ Generation Advanced High-strength Steels

Abstract

Three lightweight steels with densities between 7.3 and 7.5g/cm3 met property goals for third generation advanced high-strength steels. Plates were cast, homogenized, and hot rolled to produce a prior austenite grain size of 50 μ. Hot rolled microstructures consisted of ferrite stringers, bainitic ferrite, and retained austenite. First principles calculations were used to investigate defect structures and phase stability. the compositions of the alloys were formulated using phase equilibrium modeling and stacking fault energy calculations. the composition in weight percentage of the alloys ranged from 0.1 to 0.2% C, 13.5 to 13.9% Mn, 3.4 to 4.5% Al, and 1.3 to 2.1% Si. This range of compositions produced alloys with calculated stacking fault energies between 26 mJ/m2 and 35 mJ/m2. the alloys exhibited transformation induced plasticity during tensile testing with ultimate tensile strengths between 865 and 974 MPa with necking strains up to 39%.

Department(s)

Physics

Second Department

Materials Science and Engineering

Keywords and Phrases

Acicular ferrite; Advanced high-strength steels; Bainitic ferrite; Retained austenite

International Standard Book Number (ISBN)

978-193511713-1

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Ronald E. Ashburn Publisher, All rights reserved.

Publication Date

30 Nov 2010

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