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The Effects of Silicon and Nickel Additions on the Mechanical Properties of Heavy Section Ductile Irons for Wind Mill  

Park, Heung-Il (Pukyong National University, Div. of Advanced Materials Science and Engineering)
Kim, Woo-Yeol (Pukyong National University, Div. of Advanced Materials Science and Engineering)
Ahn, Won-Young (Han-Hwang Industrial Co. Ltd.)
Publication Information
Journal of Korea Foundry Society / v.26, no.6, 2006 , pp. 258-266 More about this Journal
Abstract
The purpose of this study was to investigate the effects of silicon and nickel additions that influenced the impact and tensile properties of heavy section as-cast ductile irons for wind mill. Based on the results of the metallographic analysis and the mechanical testing on the 2.0 wt.%Si (LS group) and 2.4 wt.%Si (HS group) ductile irons, which contains 0.0, 0.3, 0.6 and 0.9 wt.%Ni, respectively, the following conclusions could be obtained. The nickel additions increased the tensile properties, the microhardness of pearlite, and the pearlite fraction of matrix for the specimen with the same silicon content. The mechanical properties of LS group specimen were in the range of the specification for the ductile iron wind mill castings. The LS group specimens showed higher absorbed impact energy at room temperature and $-20^{\circ}C$ than that of the HS group specimens. However, the absorbed impact energy at $-20^{\circ}C$ for the HS group specimens was observed to be sharply decreased under 10 J by addition of the nickel.
Keywords
Ductile Iron; Wind mill; Silicon and nickel additions; Impact energy;
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