잉여황의 주철의 흑연 구조에 미치는 영향 = The Effect of Excess Sulfur on the Graphite Structure of Cast Iron

다국어 초록 (Multilingual Abstract)

The effect of excess sulfur, which is defined as the following equation, on the graphite structure of cast iron, which were treated with the addition of 5% Mg-Fe-Si and aluminum of 0.1 to 0.6%, was studied. △S＝final %S -0.34(%RE) -1.33(%Mg) Nodularity increased as the excess sulfur decreased and nodular graphite structure over 80% was obtained with the excess sulfur of less than -0.0285%. Compacted-vermicular graphite over 80% and all flake graphite structures were obtained with the values between -0.0155 and 0.0005% and of more than 0.0020%, respectively. The working range of excess sulfur for the production of more than 80% compacted-vermicular graphite structure was expanded as the amount of aluminum addition increased. Aluminum in the liquid phase inhibits the nodularization of graphite by promoting the segregation of sulfur in it.