Toughening Mechanisms in Ultrahigh-Strength Steels

Abstract

A systems approach to materials design is extended to adaptive microstructures undergoing a programmed dynamic evolution in both processing and service to achieve novel combinations of properties. Fundamental principles are developed to support rational design of high-toughness ultrahigh-strength martensitic steels of interest for advanced armor and high performance gear applications. Theoretical modelling and high resolution microanalytical experiments in the martensitic alloys address control of autocatalytic coherent precipitation to achieve efficient strengthening without embrittlement, and the controlled precipitation of optimal stability metastable austenite for adaptive dilatant transformation plasticity tuned to crack-tip stress states for efficient interaction with strain localization processes in ductile fracture. Fracture toughness, Precipitation strengthening, Transformation toughening.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1993
Accession Number
ADA275439

Entities

People

  • G. B. Olson
  • T. Mura

Organizations

  • Northwestern University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Synthesis
  • Chemistry
  • Crystal Lattices
  • Crystal Structure
  • Crystallography
  • Elastic Properties
  • Iron
  • Materials
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Phase Transformations
  • Solid Solutions
  • Systems Engineering
  • Tensile Strength
  • Transition Metals

Readers

  • Distributed Systems and Data Platform Development
  • Materials Science (Mechanical Engineering).
  • Metallurgy