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이준섭 ( Jun-seob Lee ),이준형 ( Jun-hyung Lee ),오준석 ( Jun-seok Oh ),이재현 ( Je-hyun Lee ) 한국부식방식학회 2021 Corrosion Science and Technology Vol.20 No.6
The effect of carbon addition on the general corrosion behavior of high-chromium cast iron (HCCI) was studied by a scanning electron microscope with energy dispersive spectroscopy (SEM-EDS) or electron back-scattered diffraction (EBSD), or electrochemical polarization techniques in 0.1 mol dm<sup>-3</sup> H<sub>2</sub>SO<sub>4</sub> + 0.05 mol dm<sup>-3</sup> HCl at room temperature. The addition of 2.1-2.8 wt% carbon to HCCI increased the fraction of eutectic austenite and eutectic carbide phases, while that of HCCI decreased the fraction of the primary austenitic phase. Potentiostatic polarization of the HCCI at -0.35 V<sub>SSCE</sub> or 0.0 V<sub>SSCE</sub> resulted in preferential general corrosion of the primary austenitic or eutectic austenitic phases, respectively. The decrease in corrosion current density and the shift in noble corrosion potential direction with increasing carbon content in the HCCI indicated that the fraction and the chemical composition of austenitic (primary and eutectic) and carbide phases were strongly related to the general corrosion behavior of the HCCI.
CMSX-10 단결정 초내열합금에서 일방향 응고 공정변수에 따른 응고조직 변화도
구지호 ( Ji Ho Gu ),정형민 ( Hyung Min Jung ),이정석 ( Jeong Seok Lee ),윤혜영 ( Hye Young Yoon ),서성문 ( Seong Moon Seo ),조창용 ( Chang Yong Jo ),이재현 ( Je Hyun Lee ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.3
Directional solidification experiments were carried out on a single crystal Ni base superalloy CMSX-10 over a wide range of growth velocity and temperature gradient conditions. Under the imposed temperature gradients, the primary dendrite arm spacings decreased proportionally with the growth velocity. Microstructural characteristics at the solid/liquid interface were found to depend strongly on the growth velocities and temperature gradients. Based on the experimental observations, a growth velocity versus temperature gradient map was selected for planar to cellular and cellular to dendritic transitions during solidification. As a result, the microstructure selection map for the alloy was established by comparing it to theoretical models. Good agreement was obtained from the results for planarcellular and cellular-dendritic transitions. The columnar-equiaxed transition, however, was calculated using Hunt`s model for castings. The results are discussed in terms of the combined effects of constitutional undercooling and nucleation undercooling ahead of the growing dendrite tips.