EXPERIMENTAL ELECTROMAGNETIC TEST METHODS FOR THE NONDESTRUCTIVE EVALUATION OF CARBURIZED STEEL PARTS,

Abstract

Several experimental electromagnetic test methods were investigated for application to the nondestructive evaluation of carburized steel parts. The results of the study indicate that an accurate and rapid measure of the case depth of carburized parts can be made based on measurements of the phase of the third harmonic component of the secondary test coil voltage. This test parameter can be relatively insensitive to certain normal process variables. An a.c. inductance bridge was used to obtain measurements indicative of the tempering temperature and free ferrite content of the part. The results of an investigation concerning the influence of retained austenite and residual stress on the magnetic comparator evaluation of carburized steel samples are also reported. Experimental procedures are outlined and results are discussed in terms of potential applications to nondestructive testing problems. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 29, 1964
Accession Number
AD0603536

Entities

People

  • H. P. Hatch
  • K. A. Fowler

Tags

DTIC Thesaurus Topics

  • Austenite
  • Comparators
  • Inductance
  • Measurement
  • Nondestructive Testing
  • Residual Stress
  • Residuals
  • Steel
  • Stresses
  • Tempering
  • Test And Evaluation
  • Test Methods

Readers

  • Electrical Engineering
  • Powder metallurgy of Titanium alloys.
  • Structural Health Monitoring of Composite Structures.