http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
흑심가단주철의 제1단 흑연화에 미치는 Se , CaCO3 및 CaO 첨가의 영향
이호종,나형용 ( Ho Jong Lee,Hyung Yong Ra ) 한국주조공학회 1986 한국주조공학회지 Vol.6 No.4
The effects of Se, CaCO₃and CaO addition on the first stage graphization of malleable iron were evaluated. The results obtained in this work were as follows. 1. Many gas bubbles were found in the white cast iron under Se, CaCO₃addition. 2. Nodular graphite were formed by annealing of the white cast iron with remained gas bubbles. 3. When specimens were annealed, bubbles provided the nucleation sites that were needed in graphite precipitation, so the nucleation rate of graphite was increased. 4. The remained gas bubbles and defects were more effective for the graphitization than metallic compounds.
과 공정주철에서 흑연의 형상에 미치는 Mischmetal Hydride 첨가의 영향
이호종,김관휴,나형용 ( Ho Jong Lee,Kwan Hyu Kim,Hyung Yong Ra ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.2
N/A The effects of mischmetal hydride 0.5wt% addition on the graphite morphology according to the various S contents and holding times were investigated. The results obtained in this work were as follows. 1. Giving a short time after the MmH₂addition, nodular graphites were formed by means of many bubbles remained in the melt. 2. The more S was given in the melt, the less the surface tension of the melt became. So the remained gas bubbles in the case of high S Content were decreased both number and size, and irregular nodular graphites were formed. 3. Mischmetal sulfides remained in the melt acted as heterogeneous nuclei not for the graphite precipitation but for the gas bubble formation. The remained gas bubbles in the melt operated as the site of the graphite precipitation.