SEDL / STP / STP369-EB / STP43759S

A Study of Internal-Friction Peaks in Type 304 Stainless Steel Containing Nitrogen

Eckel, J. F.
Head, Virginia Polytechnic Inst., Blacksburg, Va.

Manning, C. R.
Research metallurgist, National Aeronautical Space Administration, Langley Field, Va.

Pages: 6    Published: Jan 1965

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Abstract

Internal-friction studies were made on 304 austenitic stainless steel to determine if this is a valid method for measuring interstitial diffusion in face-centered metals and alloys. Both unnitrided and nitrided 304 stainless steel wires were tested in a torsional pendulum at frequencies from 0.33 to 1.1 cps. Internal-friction spectra were recorded and analyzed. The conclusions reached were that interstitial atoms can cause relaxation peaks to appear on the internal-friction spectra and that the observed peaks were much broader than nitrogen-induced peaks in body-centered cubic materials.