AUSTENITIC DECOMPOSITION IN WELDING STEEL,

Abstract

A time-temperature controller was used in conjunction with a dilatometer to study the transformational behavior of weld heat-affected zone austenite upon cooling from a 1700 F peak tem perature. Continuous-cooling transformation diagrams were made in this way of AISI 4340 steel initially quenched-and-tempered to 54 and 44 Rc hardness levels. A characteristic growth curve for an isothermal bainite transformation was determined dilatometrically. The amount of austenite retained at room temperature was found to increase and then decrease during the bainite rapid-reaction period. Impact tests indicated that retained austenite in the amounts present was not necessarily deleterious to notch toughness. A limited arc-welding study was made and compared with the time-temperature controller work. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1963
Accession Number
AD0407363

Entities

People

  • Mark M. D'andrea Jr.

Tags

DTIC Thesaurus Topics

  • Arc Welding
  • Austenite
  • Decomposition
  • Dilatometers
  • Hardness
  • Impact Tests
  • Materials
  • Mechanical Properties
  • Mobility
  • Notch Toughness
  • Physical Properties
  • Steel
  • Toughness
  • Welding

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Metallurgy