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Effect of Semi Austempering Treatment on the Fatigue Properties of Ductile Cast Iron

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Abstract:

Single phase bainite structure which is obtained by the conventional austempering treatment reduces the ductility of ductile cast iron. Because of the reduction of ductility it is possible to worsen the fatigue properties. Therefore, semi austempered ductile iron which is treated from  +ϒ is prepared to investigate the static strength and fatigue properties in comparison with fully austempered ductile iron (is treated from ϒ). In spite of semi austempered ductile iron shows the 86% increase of ductility. Also, semi austempered ductile iron shows the higher fatigue limit and lower fatigue crack growth rate as compared with fully austempered ductile iron. By the fractographical analysis, it is revealed that the ferrite obtained by semi austempering process brings about the plastic deformation(ductile striation) of crack tip and gives the prior path of crack propagation. The relatively low crack growth rate in semi austempered specimen is caused by above fractographical reasons

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Periodical:

Key Engineering Materials (Volumes 345-346)

Pages:

295-298

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.345-346.295

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Online since:

August 2007

Authors:

Bokkyu Lim, Young Woo Choi

Keywords:

Austempered Ductile Iron, Fatigue Crack Growth Rate (da/dN), Fatigue Life, Fatigue Strength

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

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