Surface conditions and the fatigue behavior of nodular cast iron

✍ Scribed by Radomila Konečná; Marian Kokavec; Gianni Nicoletto

• Publisher: Elsevier
• Year: 2011
• Tongue: English
• Weight: 556 KB
• Volume: 10
• Category: Article
• ISSN: 1877-7058
• DOI: 10.1016/j.proeng.2011.04.418

✦ Synopsis

Since fatigue is largely a surface-controlled phenomenon, the use of as-cast specimen surfaces is expected to give different fatigue strength from that observed for smooth specimens. In the present work the fatigue behavior of pearlite/ferrite NCI specimens having different surface conditions, namely i) as-cast, ii) shot-blast and iii) fine-ground is discussed. The dependence of the fatigue behavior on specific surface condition is highlighted using prismatic specimens tested under cyclic plane bending with maximum stress reached at the surface of interest. The results show a scatter in fatigue life for all the investigated stress amplitudes, which can be associated with the surface conditions.