Paper Title:
Fatigue Properties of Ni-Base Superalloy in Long Life Region
  Abstract

Fatigue properties of Inconel 718 at 500°C were investigated under rotating bending. Fatigue strength was higher at 500°C than at room temperature. Fracture occurred by the initiation and propagation of a surface crack in short life region. The early propagation of a surface crack smaller than 20-30 μm was suppressed by oxidation at 500°C. This is a main reason for the higher fatigue strength at 500°C. However, the crack growth after the retardation of a small crack growth at 500°C was accelerated reflecting the lower static strength. On the other hand, in long life region, though a surface crack initiated at the early stage of fatigue life similar to the case in short life region, the crack did not propagate over 20-30 μm, and an internal fracture occurred. Consequently S-N curve at 500°C showed a duplex property and the fatigue limit was not recognized. The subsurface damage was initiated at the early stage of fatigue life.

  Info
Periodical
Key Engineering Materials (Volumes 353-358)
Edited by
Yu Zhou, Shan-Tung Tu and Xishan Xie
Pages
126-129
DOI
10.4028/www.scientific.net/KEM.353-358.126
Citation
Y. Matsuyama, N. Kawagoishi, Q. Y. Wang, K. Morino, E. Kondo, N. Yan, "Fatigue Properties of Ni-Base Superalloy in Long Life Region", Key Engineering Materials, Vols. 353-358, pp. 126-129, 2007
Online since
September 2007
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Price
$32.00
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