Temper Embrittlement in 4140 Seamless Tubing

Abstract

In November 1976, several 155mm Howitzer M185 split rings failed during various stages of manufacture. A failure analysis consisting of metallography, SEM, and mechanical testing, was undertaken. This investigation concluded that the heat treatment was responsible for embrittling the steel, thereby causing the failures. Furthermore, it was shown that the required hardness could not be achieved without seriously compromising the toughness of this material.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1977
Accession Number
ADA051294

Entities

People

  • Peter Thornton
  • Steve Tauscher

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alloys
  • Boundaries
  • Chemical Analysis
  • Electron Microscopy
  • Embrittlement
  • Failure Mode And Effect Analysis
  • Grain Boundaries
  • Hardness
  • Heat Treatment
  • Materials
  • Mechanical Properties
  • Residual Stress
  • Scanning Electron Microscopy
  • Stresses
  • Tempering
  • Toughness
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Nanofabrication and Microfabrication.