Paper Title:
Influence of Plasma Radical Nitriding on Fatigue Properties of SCM435 Steel
  Abstract

The effect of plasma radical nitriding treatment on fatigue properties of SCM435 steel in super long life region was investigated. Fatigue tests were carried out using a dual-spindle rotating bending fatigue-testing machine at room temperature in air for the specimens nitrided at 773 K and 823 K for 3 hrs. The fatigue strength of nitrided specimen was greater than that of un-nitrided specimen and the crack initiation mode changed from the surface cracking of un-nitrided specimen to the subsurface cracking of nitrided specimen. Hardening layer and compressive residual stress were formed by nitriding, which resulted in the improvement of the fatigue strength. The stress intensity factor was calculated using facet area in Fish-eye fracture mode. As a result, the stress intensity factor indicated almost constant value, ~ 3-4 MPa·m1/2, regardless of the number of cycles to failure.

  Info
Periodical
Key Engineering Materials (Volumes 353-358)
Edited by
Yu Zhou, Shan-Tung Tu and Xishan Xie
Pages
266-269
DOI
10.4028/www.scientific.net/KEM.353-358.266
Citation
N. Yan, I. Lee, R. Murakami, D. Yonekura, J. Sun, S. Fukui, "Influence of Plasma Radical Nitriding on Fatigue Properties of SCM435 Steel", Key Engineering Materials, Vols. 353-358, pp. 266-269, 2007
Online since
September 2007
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Price
$32.00
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