Thermal Embrittlement of 4340 Steel

Abstract

OF 1000 F within 16 days. The degree of embrittlement depended on both time and temperature. Reductions in toughness were correlated with changes in the morphology and size of ferrite grains as well as the size of carbide particles. These microstructural changes were similar to those observed in both 3140 and plain carbon steels by other investigators. Conventional anisothermal procedures used to produce temper brittleness in low alloy steels also embrittle these steels by another mechanism. Thus, the degradation of toughness attributed to temper brittleness results from two different modes of embrittlement. Transitional behavior previously described as the retrogression of temper brittleness is concluded to result from thermal embrittlement. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1972
Accession Number
AD0763900

Entities

People

  • Frank L. Carr
  • Thomas S. Desisto

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alloys
  • Brittleness
  • Carbon Steels
  • Critical Temperature
  • Elements
  • Embrittlement
  • Grain Size
  • Heat Treatment
  • High Temperature
  • Low Alloy Steels
  • Materials
  • Mechanical Properties
  • Mechanics
  • Metals
  • Steel
  • Transition Temperature
  • Transitions

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.
  • Thermal Physics or Thermal Science.