SEDL / STP / STP569-EB / STP33173S

High Strain Fatigue in a Ni(Cr)-TaC Fibrous Eutectic

Henry, MF
Metallurgist, General Electric Corporate Research and Development Center, Schenectady, N. Y.

Stoloff, NS
Professor of Materials Engineering, Rensselaer Polytechnic Institute, Troy, N. Y.

Pages: 21    Published: Jan 1975

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Abstract

The eutectic Ni(Cr)-TaC has been directionally solidified to yield a fibrous composite. The material was studied in strain-limited low-cycle fatigue at room temperature and 1000°C. The eutectic with brittle fibers and a ductile matrix was found to obey the Coffin-Manson law at both temperatures. The hysteresis behavior is explained and related to tensile deformation. Surface studies of highly polished cyclic-bend specimens revealed the fatigue crack nucleation and early growth characteristics. The data are compared to conventional materials, and the fatigue resistance is found to be essentially equivalent.