The Effect of Prior Surface Roughness on Fatigue Life of Nitrided Specimens
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F20%3APU135102" target="_blank" >RIV/00216305:26210/20:PU135102 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.4028/www.scientific.net/DDF.405.271" target="_blank" >http://dx.doi.org/10.4028/www.scientific.net/DDF.405.271</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.4028/www.scientific.net/DDF.405.271" target="_blank" >10.4028/www.scientific.net/DDF.405.271</a>
Alternative languages
Result language
angličtina
Original language name
The Effect of Prior Surface Roughness on Fatigue Life of Nitrided Specimens
Original language description
The effect of surface roughness of virgin specimens (prior roughness) made of low- alloyed high strength steel on their fatigue life after the case-hardening treatment was studied by rotating bending tests of virgin and nitrided samples. In a whole range of S-N curves, the fatigue strength of virgin samples after lathe-turning machining (high roughness) was naturally much higher than that of samples after grinding (low roughness). As expected, the fatigue strength of nitrided specimens was higher than that of virgin samples when averaged through the whole fatigue life range. When distinguishing the rough and smooth nitrided samples, the low-cycle fatigue strength of rough samples revealed to be lower than that of the smooth ones and vice a versa in the high-cycle region. This could be explained by the fact that, in the low cycle region, the cracks in the rough samples nucleated from deep surface defects while, in the smooth specimens, they nucleated from shallow defects (or as fish eyes) which prolonged their initiation stage. Almost all cracks in the high cycle region initiated as fish-eyes but the extent of nitrided layers in the rough specimens was slightly higher than that in the smooth specimens. Therefore, the fish-eye centers were shifted further to the interior of the rough specimens which increased their fatigue life.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20301 - Mechanical engineering
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Metallography XVII
ISBN
978-3-0357-1612-2
ISSN
1662-9507
e-ISSN
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Number of pages
6
Pages from-to
271-276
Publisher name
TransTech Publication
Place of publication
Švýcarsko
Event location
Nový Smokovec
Event date
Apr 24, 2019
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
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