A Cursory Examination of a Parachute Bag Knife, P/N 71172

Abstract

A parachute bag knife was received for a quick-look analysis to determine the reason for edge deformation after normal use. The U.S. Army Research Laboratory performed hardness testing, chemical analysis, and metallography. Hardness testing in conjunction with metallography showed a layer of decarburization around the periphery of the knife (not on the blade edge, however). Chemical analysis verified alloy AISI 4130 was used. Metallography also revealed a less than optimal microstructure for this alloy. It was recommended that future parts be quenched and tempered to produce a tougher knife edge.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2006
Accession Number
ADA455925

Entities

People

  • Marc S. Pepi
  • Victor Champagne

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Blade Tips
  • Boundaries
  • Ceramic Materials
  • Chemical Analysis
  • Chemistry
  • Dealloying
  • Engineering
  • Engineering Drawings
  • Grain Size
  • Hardness
  • Heat Treatment
  • Materials
  • Materials Engineering
  • Metallography
  • Microstructure
  • Military Research
  • Parachutes

Fields of Study

  • Materials science

Readers

  • Aerospace Test and Evaluation
  • Data Mining and Knowledge Discovery.
  • Metallurgy