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최성무(S.M.Choi),김상호(S.H.Kim),조원석(W.S.Cho),이성학(S.H.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
Wear and friction properties of cast iron for cylinder block bore surface-treated with an accelerated electron beam were evaluated to develop a linerless bore system shich provides numerous benefits relative to the present cast iron sleeve system. These include: a reduction in ring/bore wear. Friction. And in engine oil consumption as well as a benefit in reduced corrosion. A reduction in engine weight. Overall costs. And a removal of machining process would be realized<br/>
논문 : 분말야금 ; 분말야금법에 의해 제조된 Ti-46.6Al-2Mo-1.4Mn 금속간화합물의 미세조직 형성과정
표성규 ( Sung G. Pyo ),최성무 ( S. M. Choi ),황선근 ( S. K. Hwang ),김낙준 ( Nack J. Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.7
The present study is concerned with nucleation and growth of α phase during heat treatment in TiAl-Mo-Mn intermetallic alloy processed by hot extrusion of elemental powders. TEM and X-ray diffraction analysis show that the microstructure of as-hot extruded alloy consists of γ, α2 and B2 phases. The volume fraction of α2 and B2 phases are 16% and 20%, respectively. It shows that the B2 phase which contain significant amount of Mo have orientation relationship with γplates inside them. Microstructural evolution during heat treatment reveals that the α2 phase nucleates and grows in lamellar form by edgewise and sidewise mechanism. Edgewise growth of α2 phase is more rapid than the sidewise growth due to the coherent interface between α2 and γ phases along the sidewise direction, Sidewise growth of α2 phase occurs by ledge mechanism. It has been shown that the α phase nucleates in γ plates located at thy lamellar boundaries and grows along the direction which can make incoherent interface. γphase present in the B2 phase affects the growth of α phase by providing the preferential site for a growth.