Computer-aided design of transformation toughened blast resistant naval hull steels: Part i

A. Saha*, G. B. Olson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

A systematic approach to computer-aided materials design has formulated a new class of ultratough, weldable secondary hardened plate steels combining new levels of strength and toughness while meeting processability requirements. A theoretical design concept integrated the mechanism of precipitated nickel-stabilized dispersed austenite for transformation toughening in an alloy strengthened by combined precipitation of M2C carbides and BCC copper both at an optimal > 3 nm particle size for efficient strengthening. This concept was adapted to plate steel design by employing a mixed bainitic/martensitic matrix microstructure produced by air-cooling after solution-treatment and constraining the composition to low carbon content for weldability. With optimized levels of copper and M2C carbide formers based on a quantitative strength model, a required alloy nickel content of 6.5 wt% was predicted for optimal austenite stability for transformation toughening at the desired strength level of 160 ksi (1,100 MPa) yield strength. A relatively high Cu level of 3.65 wt% was employed to allow a carbon limit of 0.05 wt% for good weldability, without causing excessive solidification microsegregation.

Original languageEnglish (US)
Pages (from-to)177-200
Number of pages24
JournalJournal of Computer-Aided Materials Design
Volume14
Issue number2
DOIs
StatePublished - Jul 2007

Keywords

  • Austenite
  • Copper strengthening
  • Dispersion
  • Fracture toughness
  • Hardness
  • Precipitation
  • Stability
  • Transformation toughening
  • Weldability
  • Yield strength

ASJC Scopus subject areas

  • Materials Science(all)
  • Computer Science Applications
  • Computational Theory and Mathematics

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