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페라이트상을 갖는 마르텐사이트계 내열강의 미세조직 및 기계적성질에 미치는 시효처리의 영향
이상명(S. M. Lee),이정규(J. K,Lee),조영관(Y. K. Jo),이종문(J. M. Lee),강창룡(C. Y. Kang) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
This study was carried out to investigate the specimen in martensite structure added Mo and not added Mo on the aging treatment were generated each changes of microstructure and mechanical properties, the result obtained from this study are as follow: In case of specimen added Mo, A Laves phase was mainly precipitated in ferrite phase, while carbide and Laves phase were overlapping precipitated in martensite phase, on the interface of martensite and ferrite phase. In case of specimen not add Mo, A microstructure was unchanged in ferrite phase, while carbide was precipitated in martensite phase. In case of specimen added Mo, A ferrite hardness change existed two peaks with the increase of the aging time, while a martensite hardness change which a hardness in the early stage of aging was low, but a re-hardening was occurred with the increase of the aging time. In case of specimen not add Mo, While a ferrite hardness change of aging was not largely changed, a ferrite hardness change was sharply decreased in the early stage of aging, but it was slowly decreased with the increase of the aging time. The tensile strength of specimen added Mo was eventually decreased with the increase of the aging time, while the tensile strength of specimen not added Mo was slowly decreased. A Sharpy impact's value of specimen added Mo was largely decreased by the aging treatment, while it was slowly increased with the increase of the aging time, in case of specimen not add Mo was gradually increased in the early stage of aging, the aging time was long, then it was quickly increased. The Disk shape of Laves phase precipitation in the early stage of aging was largely decreased the impact toughness .
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함영복(Y. B. Ham),윤소남(S. N. Yun),최준혁(J. H. Choi),조원용(W. Y. Cho) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Water hydraulics instead of conventional oil hydraulics has been used as an environment-friendly pressure medium because of high power density, pollution-free, low fire risk and so on. Especially, water hydraulic power generation pump has used to be the research subject in relation to its relative sliding movement, material, design and manufacturing methods. In this paper, we applied the engineering plastic-coated sliding components against the stainless steel to a water hydraulic power generation pump. We have designed the tilting cam drive mechanism consist of rod type pistons and constant velocity joint and analyzed the friction stress of sliding components. Finally, combining each component of verified materials, rod type piston and constant velocity joint was developed low leakage and low friction water hydraulic power generation pump with high efficiency.
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