pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (26권6호 258-266)
The Effects of Silicon and Nickel Additions on the Mechanical Properties of Heavy Section Ductile Irons for Wind Mill
풍력발전용 후육 구상혹연주철의 기계적 성질에 미치는 Si 및 Ni 첨가의 영향
Heung'Il Park, Woo-Yeol Kim , Won-Young Ahn*
Pukyong National University, *Han-Hwang Industrial Co.
The purpose o f this study was to investigate the effects o f silicon and nickel additions that influenced the impact and tensile properties o f heavy section as-cast ductile irons for wind mill. Based on the results o f 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 o f pearlite, and the pearlite fraction o f matrix for the specimen with the same silicon content. The mechanical properties o f LS group specimen were in the range o f the specification for the ductile iron wind m ill castings. The LS group specimens showed higher absorbed impact energy at room temperature and -20°C than that o f the HS group specimens. However, the absorbed impact energy at -20°C for the HS group specimens was observed to be sharply decreased under 10 J by addition o f the nickel.
Ductile Iron, Wind miU, Silicon and nickel additions, Impact energy.