Determination of Inclusion Chemistry and Size Distribution in Steel Weldments by Analytical Electron Microscopy

Abstract

The U.S. Navy has been concerned about reducing the number of inclusions in steel weldments to increase the toughness of the weld metal. Research has shown that particular inclusions can nucleate the acicular ferrite micro structure in the weld metal, which can increase toughness without compromising strength. The present study investigated the inclusion chemistry and size distribution in aluminum-deoxidized C-Mn steel weldments. The results showed that the addition of aluminum to the C-Mn weld metal will produce inclusions, that can nucleate acicular ferrite by epitaxy, and that the number and volume fraction of inclusions is reduced. This indicates that aluminum deoxidation of steel weld metal can have positive benefits for C-Mn weld metal strength and toughness.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2001
Accession Number
ADA396574

Entities

People

  • Craig A. Hackstaff

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Analysis
  • Chemical Reactions
  • Chemistry
  • Crystal Lattices
  • Crystal Structure
  • Crystallography
  • Crystals
  • Electron Microscopes
  • Electron Microscopy
  • Materials
  • Materials Science
  • Mechanical Properties
  • Microscopes
  • Microscopy
  • Scanning Electron Microscopy
  • Three Dimensional
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Metallurgy
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics