Effect of Nitriding on Fatigue Crack Initiation and Fatigue Crack Propagation Retardation in Ni-Cr-Mo Steel-Reference-Cited by-同舟云学术

Effect of Nitriding on Fatigue Crack Initiation and Fatigue Crack Propagation Retardation in Ni-Cr-Mo Steel

Published:2007-08 Issue: Volume:345-346 Page:291-294
ISSN:1662-9795
Container-title:Key Engineering Materials
language:
Short-container-title:KEM

Author:

Lim Bokkyu¹,Choi Young Woo¹

Affiliation:

1. Ulsan Automotive Parts Innovation Center

Abstract

Effect of nitriding on fatigue crack initiation and growth rate has been studied on Ni-Cr-Mo steel. Specimens were nitrided for 15hr at 680°C. The fatigue limit of nitrided specimens were superior to those of annealed(680°C, 15 hr) specimens. Based on detailed observations of slip band and micro crack initiation, it is concluded that the excellent fatigue limit of nitrided specimens is attributed to improved slip initiation resistance by nitriding. The characteristic of fatigue crack growth rate of nitrided specimens was investigated by comparing with those of annealed specimens. It was found that by nitriding the crack growth rate was markedly decreased and the threshold stress intensity factor range was improved. It is concluded that the excellent fatigue limit of nitrided specimens is also attributed to improved fatigue crack growth rate and threshold stress intensity factor range by nitriding.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Link

https://www.scientific.net/KEM.345-346.291.pdf

Reference3 articles.

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2. H.G. Kim, T.Y. Chung Challengers for the Next Century, Journal of the Korean Society for Heat Treatment, Vol. 12, No. 3 (1999), pp.270-278.

3. M.G. Kim, S.H. Lee, D.J. Shin Fatigue Properties of Nitrided Steel and Titanium through the Comparison of Fracture Mechanism , Journal of the Korean institute of metals and materials, Vol. 40, No. 6 (2002), pp.661-666.

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