Characterizations of Preheated and Non-Preheated HY-80 Steel Weldments by Transmission Electron Microscopy.

Abstract

Preheating HY-80 steel weldments is standard procedure, but it is an expensive and time consuming step in the fabrication of hull structures. The microstructures and hardness profiles of both a preheated (250 F--121 C) and a non-preheated (32 F--0 C) HY-80 steel weldment were studied to provide information and allow comparisons of the microstructural transformations that occur in the heat affected zone during shielded metal arc welding. Optical, scanning electron and transmission electron microscopy were utilized to characterize the microstructure within the heat affected zone of each weldment. The only significant difference observed was that preheating reduced the amount of transformation twinned martensite found in the weld heat affected zone which may reduce the susceptibility to hydrogen induced cold cracking. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1983
Accession Number
ADA136966

Entities

People

  • D. R. Clark

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Alloys
  • Arc Welding
  • Chemistry
  • Electron Microscopes
  • Electron Microscopy
  • Engineering
  • Ferrium
  • Hardness
  • Heat Treatment
  • Materials
  • Mechanical Engineering
  • Mechanical Properties
  • Microscopy
  • Submarine Hulls
  • Transmission Electron Microscopy
  • Welding
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Metallurgy
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics