SEDL / STP / STP811-EB / STP30569S

Comparison of Fatigue Damage in Stable and Unstable Stainless Steels

Schuster, G
Owens Corning Fiberglas Technical Center, Granville, Ohio

Altstetter, C
Professor of Physical Metallurgy, University of Illinois at Urbana-Champaign, Ill.

Pages: 19    Published: Jan 1983

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Abstract

As a result of the stress-induced martensitic transformation of certain austenitic stainless steels their fatigue behavior is modified. A number of experimental techniques have been applied in order to understand why this occurs. The methods used include metallography of various types, electron diffraction, magnetic permeability, and local mechanical property determination. The advantages and disadvantages of the various techniques are discussed, and by a combination of techniques various hypotheses to explain the fatigue phenomena are examined and reinforced or rejected. It is concluded that the volume expansion resulting from the phase transformation causes a favorable residual stress state at the crack tip.