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http://dx.doi.org/10.3795/KSME-A.2005.29.3.462

Effect of Fully and Semi Austempering Treament on the Fatigue Properties of Ductile Cast Iron  

Lim Bok-kyu (강원대학교 대학원 기계메카트로닉스공학과)
Hwang Jung-gak (강원대학교 대학원 기계메카트로닉스공학과)
Kim Dong-Youl (삼척대학교 기계메카트로닉스공학부)
Kim Min-gun (강원대학교 기계메카트로닉스공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.29, no.3, 2005 , pp. 462-469 More about this Journal
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 ${\alpha}+{\gamma}$ is prepared to investigate the static strength and fatigue properties in comparison with fully austempered ductile iron (is treated from ${\gamma}$). 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.
Keywords
Fatigue Properties; Fully and Semi Austempered Ductile Iron; Crack Growth Rate;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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