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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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리쯔밍(Z. M. Li),이지민(J. M. Lee),박성환(S. H. Park),김종식(J. S. Kim),박용호(Y. H. Park) 한국동력기계공학회 2011 한국동력기계공학회지 Vol.15 No.6
In this paper, an electro hydraulic power steering system based on electro hydrostatic actuator (ERA) is proposed. A detailed steering model for the proposed electro hydraulic power steering system including mechanical and hydraulic subsystems is established. A conventional electro hydraulic power steering system is also modeled to evaluate the performance of the proposed power steering system such as responsiveness, assist force, command tracking and steering feel by computer simulation. From the computer simulation results, it is found that the proposed power steering system based on EHA has desirable performance.
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레이저 및 TIG 용접된 오스테나이트계 스테인리스강의 기계적 특성에 대한 연구
정성민,박인덕,남기우,최병철 한국동력기계공학회 2019 한국동력기계공학회지 Vol.23 No.2
Austenitic stainless steel is used in the nuclear industry as structural materials and coatings because it has excellent workability, weldability and high temperature characteristics. Nuclear power plant structures are mainly large structures manufactured using welding which is mainly arc welding. Arc welding is a welding method with relatively high heat input. Austenitic stainless, however, steel requires low heat input because it has high thermal expansion coefficient and lower thermal conductivity than that of carbon steels. Over heat input may cause various welding defects such as severe deformation and coarsening of the grain in the joint, which may result in deterioration of the mechanical properties. Recently, laser welding has been proposed to solve the problem of heat input. In this study, the thickness of 6 mm STS304L of austenitic phase was butt welded using laser and TIG, and mechanical properties were compared and analyzed. Joints of laser welding show better tensile and impact properties than that of TIG. However, the bending properties were worse than that of TIG. 오스테나이트계 스테인리스강은 가공성, 용접성, 고온특성이 우수하여 원자력 산업에서 구조재 및 피복재로 사용되고 있다. 원자력 산업의 대형 구조물은 주로 아크 용접으로 제조되고 있지만 아크 용접은 상대적으로 재료에 부하되는 입열량이 큰 용접법이다. 오스테나이트계 스테인레스강은 탄소강보다 열팽창 계수가 높고 열전도율이 낮기 때문에 적은 입열을 요구하는 재료이다. 용접 시 과입열은 열변형, 결정립의 조대화 등의 문제를 일으켜 기계적 특성을 저하시킬 수 있다. 최근에는 입열 문제를 해결하기 위해 레이저 용접이 제안되고 있다. 본 연구는 두께 6mm의 STS304L 오스테나이트계 스테인리스강을 레이저 및 TIG 용접하여 기계적 특성을 비교 분석하였다. 레이저 용접부는 TIG 용접부 보다 우수한 인장 및 충격 특성을 나타내었다. 그러나 굽힘 특성은 TIG 용접부에서 다소 우수하였다.
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