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가공유기 마르텐사이트 변태를 갖는 합금의 감쇠능에 미치는 가공열처리의 영향
한현성,강창룡,Han, Hyun-Sung,Kang, Chang-Yong 한국재료학회 2019 한국재료학회지 Vol.29 No.3
This study investigates the effect of thermo-mechanical treatment on the damping capacity of the Fe-20Mn-12Cr-3Ni-3Si alloy with deformation induced martensite transformation. Dislocation, ${\alpha}^{\prime}$ and ${\varepsilon}-martensite$ are formed, and the grain size is refined by deformation and thermo-mechanical treatment. With an increasing number cycles in the thermo-mechanical treatment, the volume fraction of ${\varepsilon}-martensite$ increases and then decreases, whereas dislocation and ${\alpha}^{\prime}-martensite$ increases, and the grain size is refined. In thermo-mechanical treated specimens with five cycles, more than 10 % of the volume fraction of ${\varepsilon}-martensite$ and less than 3 % of the volume fraction of ${\alpha}^{\prime}-martensite$ are attained. Damping capacity decreases by thermo-mechanical treatment and with an increasing number of cycles of thermo-mechanical treatment, and this result shows an opposite tendency for general metal with deformation induced martensite transformation. The damping capacity of the thermo-mechanical treated damping alloy with deformation induced martensite transformation greatly affect the formation of dislocation, grain refining and ${\alpha}^{\prime}-martensite$ and then ${\varepsilon}-martensite$ formation by thermo-mechanical treatment.
구상흑연주철의 기계적 성질 및 감쇠능에 미치는오스템퍼링 처리의 영향
이상희(Sang-Hee Lee),한현성(Hyun-Sung Han) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.3
Effect of austempering treatment on the mechanical properties and damping capacity of ductile cast iron was investigated. Maximum quantity of austenite and carbon contents in retained austenite obtained at 400℃, and increased with the increase of austempering time. Tensile strength and impact value was increased, and elogation was decreased by austempering treatment. With the increase austempering temperature, tensile strength, elongation and, impact value was decreased. Damping capacity was decreased by austempering treatment and not effect of austempering temperature and time.
텅스텐이 첨가된 슈퍼 2상 스테인리스강의 내부식성에 관한 연구
최한글(Han-Gul Choi),박형균(Hyung-Gyun Park),정병호(Byung-Ho Jung),한현성(Hyun-Sung Han),배동수(Dong-Su Bae),강창룡(Chang-Yong Kang) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.5
The effect of aging on the precipitation if the σ phase and corrosion resistance in W-substituted, super-duplex stainless steel was investigated. The volume fraction of the σ phase and the current density increased as the aging temperature increased up to 750℃, and, then, they decreased. As aging time increased, the volume fraction if the σ phase and the current density also increased. The σ phase considerably influenced to corrosion resistance. When Mo was substituted for W in super-duplex stainless steel, the volume fraction of the σ phase and the current density both decreased markedly.
고 Mn 오스테나이트계 스테인리스강의 기계적 성질에 미치는 가공온도의 영향
강창룡(Chang-Yong Kang),허태영(Tae-Young Hur),김영화(Young-Hwa Kim),구차진(Cha-Jin Koo),한현성(Hyun-Sung Han),이상희(Sang-Hee Lee) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.3
This study was carried out to investigate the effect of the deformation temperature in high manganese austenitic stainless steel. a’-martensite was formed with a specific direction by deformation. The volume fraction of the deformation induced martensite was increased by increasing the degree of deformation and decreasing the deformation temperature. With the increase in the deformation, the hardness and tensile strength were increased, while the elongation was rapidly decreased at the initial stage of the deformation, and then gradually decreased. The hardness and tensile strength were increased and the elongation was decreased with adecrease in the deformation temperature. The hardness and tensile strength were strongly controlled by the volume fraction of martensite, but the elongation was controlled by the transformation behavior of the deformation induced martensite.