http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Fe - Si - C 계 압분체의 소결에 따른 조직 변화
최답천(D . C . Choi),이도재(D . J . Lee),이방식(B . S . Lee),강길원(K . W . Kang) 대한금속재료학회(구 대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.2
Change of microstructure and pore shape during sintering was investigated in Fe-2.5% Si-l.4%C compacts. The compacts were sintered at 1140, 1150, 1160 and 1170℃ in Ar atmosphere for various sintering time. Slow and rapid cooling after sintering allowed to examine the behavior of inter-diffusion between elemental particles, change of microstructure and pore shape of sintered alloy. At early stage of sintering, as-quenched microstructure was fine pearlite and it changed to marten-site with succesive sintering upto 27 hr. This change of microstructure with sintering time seems closely related to the homogenization process of Si. Dissimilarly to the previous reports, two type of pores, surrounded by ferrite or pearlite, were observed in slowly cooled specimen after sintering 27 hr. This result suggests that the local content of carbon and silicon were slightly different due to the sluggish diffusion of Si.
이경구,윤동주,기회봉,최답천,이도재 한국열처리공학회 1999 熱處理工學會誌 Vol.12 No.1
In the present study, oxidation behavior of 304 and 316 stainless steels Was investigated. After solution treatment, specimens were polished up to 1㎛ Al₂O₃grade and then subjected to oxidation treatment in dry air. The range of temperature was used for oxidation treatment at 300℃∼500℃ and TEM was used for analyzing the components and structure of oxide film. Also, these results were compared with the results of ESCA and TG. According to the results of TEM analysis, it was found that Cr oxide film was formed on top of the surface after room temperature oxidation but amorphous Fe oxide was formed on top of the surface and polycrystalline (Cr,Fe)₂O₃was formed below the amorphous Fe oxide layer after 500℃ oxidation treatment. The oxidized specimens at 500℃ showed that 316 stainless steel resists more strongly to grain and grain boundary oxidation than 304 stainless steel. These results suggested that Mo component resolved in 316 stainless steel matrix suppressed the formation of Cr carbide which may results in local Cr deplete area.