GRAIN BOUNDARY SEGREGATION AND THE COLD WORK PEAK IN IRON CONTAINING CARBON OR NITROGEN,

Abstract

Samples of iron containing 0.07 weight % nitrogen or 0.015 weight % carbon have been given treatments similar to those used in cold work peak (CWP) measurements and examined by transmission electron microscopy. It was observed that the unusual and non-reproducible behavior of the carbon CWP can be explained by a strong tendency for carbon to form grain boundary precipitates at temperatures below those used for CWP measurements. These precipitates dissolved at the temperatures used in the CWP measurements. There was no evidence for nitrogen precipitation at grain boundaries. There was no indication of precipitation along dislocations in either carburized or nitrided samples given treatments similar to those of CWP measurements. Although it is possible that sub-electronmicroscopic clustering had occurred, this observation supports the theories of the CWP that are based on continuous atmospheres rather than on individual precipitates. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1965
Accession Number
AD0613970

Entities

People

  • Mervyn L. Rudee
  • Robert A. Huggins

Organizations

  • Stanford University

Tags

DTIC Thesaurus Topics

  • Atmospheres
  • Boundaries
  • Chemical Reactions
  • Clustering
  • Dislocations
  • Electron Microscopy
  • Electrons
  • Grain Boundaries
  • Measurement
  • Microscopy
  • Nitrogen
  • Precipitates
  • Precipitation
  • Transmission Electron Microscopy

Readers

  • Gulf War Illness and Chronic Multisymptom Illness in Veterans.
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics