http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이희춘,임창희,나형용 ( H . C . Lee,C . H . Lim,H . Y . Ra ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.3
In this study the principles of melting phenomena of compacted vermicular graphite cast iron are discussed by considering the effects of the variation of phosphorus content and heating rate on the quenched microstructure of the specimens. In compacted vermicular graphite cast iron containing little phosphorus, the melting phenomena are found initially at the outer region of austenite shell and subsequently progressed with the diffusion of carbon through the austenite shell without regard to heating rate. But as the phosphorus content was increased over than 0.12wt.%, the melting phenomena initiated at the boundary of eutectic shell and progressed along the contact area between the melt and graphite tips at higher heating rate. At lower heating rate, the melt of steadite dissolved at the lower temperature than that of eutectic was moved toward the graphite through the austenite grain-boundary and promoted melting of graphite and matrix.
급속응고된 Al-10wt% Ti 합금의 미세조직과 열안정성에 대한 연구
김원태,오규환,금동화,김혜성,이희춘 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.10
Al-10wt% Ti alloy was rapidly solidified by N₂gas atomization process, and the resulting alloy powders were consolidated by hot extrusion with an extrusion ratio of 17 : 1. The characteristics of the powders and the microstructures of the powders and extrudates have been examined by using a combination of particle size analyser, X-ray diffractometer, and optical, scanning electron and transmission electron microscopes. At-10wt% Ti powders show a spherical shape with mean particle size of 50㎛, and a microstructure of equiaxed α-Al grain of 2-3㎛ with Al₃Ti particles. Powders smaller than 44㎛ consist of α-Al, Ll₂metastable Al₃Ti and DO_(22) equilibrium Al₃Ti. With increasing th powder size, metastable Al₃Ti particles disappears and equilibrium Al₃Ti particles with a petal like shape become dominant. The metastable and equilibrium Al³,Ti particles show following orientation relationships with the surrounding α-Al matrix :[100]_(Al)//[001]DO_(22)-Al₃Ti and[010]Ll₂-Al₃Ti;[100]_(A1)//[100]Ll₂-Al₃Ti and[010]_(Al)//[010]Ll₂-Al₃Ti Extrudates show a uniform show a uniform distribution of equilibrium Al₃Ti particles in α-Al matrix with grain size of 2㎛