Paper Title:
Microstructure-Aided Analysis of Fatigue Thresholds in Duplex Stainless Steel
  Abstract

High fatigue threshold values of duplex ferritic-martensitic steels are interpreted by using a unified model of roughness- and plasticity induced crack closure. Complex metallographical and fractographical analysis was performed in order to obtain characteristics of tortuous crack paths produced by crack deflection and branching mainly at austenite/ferrite interfaces. Calculated values of effective thresholds are in a good agreement with experimental data. The total level of extrinsic toughening (closure + shielding) induced by the duplex microstructure was determined to be as much as 70% of measured fatigue threshold values. This is the main reason for the high resistance to propagation of long fatigue cracks in the near-threshold region.

  Info
Periodical
Materials Science Forum (Volumes 567-568)
Edited by
Pavel Šandera
Pages
101-104
DOI
10.4028/www.scientific.net/MSF.567-568.101
Citation
J. Pokluda, T. Podrábský, K. Slámečka, S. Hutařová, G. C. Chai, "Microstructure-Aided Analysis of Fatigue Thresholds in Duplex Stainless Steel", Materials Science Forum, Vols. 567-568, pp. 101-104, 2008
Online since
December 2007
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Price
$32.00
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