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오스테나이트계 스테인리스강의 강도 및 감쇠능에 마치는 미세조직의 영향
손동욱(D. U. Son),김재환(J. W. Kim),이종문(J. M. Lee),강창룡(C. Y. Kang) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The effect of the phases of v, α' and ε martensite, which constitute the structure of the 316L stainless steel with austenite structure at room temperature, on the damping capacity and tensile properties has been investigated. Various fraction of these phases were formed depending on the cold work degree, namely the volume fraction of ε martensite showed maximum value about at 20% cold rolling. while the volume fraction of α' martensite continuously rose according to the increase of cold rolling. The behavior of damping capacity with increasing the degree of cold rolling is the same as that of E martensite. The maximum value of damping capacity showed near at 20% cold rolling formed the largest volume fraction of ε martensite phase. With increasing the volume fraction of α' martensite, tensile strengths increased and elongation decreased due to the increment in the volume fraction of martensite induced by deformation. The damping capacity and elongation is strongly controlled by the volume fraction of E martensite with liner relationship. however, the effect of damping capacity on the volume fraction of α' martensite and austenite phase was not observed. while, tensile strength was controlled by the volume fraction of α' martensite.
Fe-Cr-Mn-X 합금의 감쇠능 및 강도에 미치는 변태 유기 소성의 영향
손동욱(D. W. Son),강창룡(C. Y. Kang),이종문(J. M. Lee) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This study is to improve this problem and get data about developing new alloy with high strength and damping capacity, because every machine and precision instrument bring about many problem - lowering of details and fatigue failure of parts at an early stage etc, by noise and oscillation. it get the following of conclusion. It make two specimen which add 3% Co and 1% Ti for formation of effective Nitride Layer where has high strengh at surface of. damping steel in side for improving damping capacity and make low stacking fault energy at Chemical Composition of Fe-12Cr-22Mn and also examining the damping steel apply at the parts which require wear resistance. It differ microstructure by cold working which differ amount of processing and investigate damping capacity and strength of change in proportion as change of microstructure and adding alloy element, and it get such conclusion from this experiment. two specimen all, damping capacity is strongly under the control of e martensite, but a' martensite and austenite don't have an effect on damping capacity. and, due to the specimen which add 1 % Ti has more amount of e martensite than specimen which add 3% Co, it confirm that logarithmic decrement is high.
Fe-12Cr-22Mn-X 합금의 강도, 감쇠능 및 플라즈마 이온 질화 특성에 대한 연구
이도훈(D. H. Lee),엄정호(J. H. Eom),손동욱(D. W. Son),이종문(J. M. Lee),강창룡(C. Y. Kang) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
To obtain the proper surface hardening layer, maintaining the damping capacity and mechanical properties, Co and Al element was added to Fe-12Cr-22Mn alloy. The studies of damping capacity, mechanical properties and plasma ion nitriding characteristics of Fe-12Cr-22Mn-X alloys studied can be summarized thus : The volume fraction of ε-martensite was increased with the increase of degree of cold rolling for two specimens, as followed was decreased after maximum value. And damping capacity has been shown as the same transformation behavior. While tensile strength was linearly increased with increasing the degree of working due to transforming austenite to martensite by working for two specimens, elongation was dramatically decreased at early stage but slowly decreased with increasing the degree of cold rolling. While the E martensite content influenced on damping capacity, in case of a ' martensite, it influenced on tensile strength. And it was possible to obtain the coefficient of friction with over 1.5x 10-3 and the strength value with over 80 kgf/㎜2. The size of the effective case depth of both specimens increase with increase of nitriding time, temperature. We could obtain the effective case depth of about 30㎛ in specimens added Co and the effective case depth of about 36㎛ in specimens added %AI, after specimens were nitrided at 490℃ for 12 hours.
슈퍼 2상 스테인리스강의 기계적 성질에 미치는 σ상 석출 및 N 첨가의 영향
김재환(J. W. Kim),손동욱(D. U. Son),이종문(J. M. Lee),강창룡(C. Y. Kang) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This study was carried out to investigate the influence of N addition and precipitation of σ phase on the mechanical properties in 25Cr-7Ni-4Mo-2W super duplex stainless steel. With increasing the annealing temperature, the volume fraction of austenite increased and volume fraction of ferrite decreased, and volume fraction of austenite increased by N addition. Tensile strength decreased and elongation increased due to increasing the volume fraction of austenite by increasing annealing temperature. Incase of N addition specimens, tensile strength and elongation showed high value. The precipitation of σ phase was precipitated at ferrite phase and interface of ferrite and austenite. the precipitation of σ phase was stimulated by applied stress. With increasing of volume fraction of precipitated σphase, tensile strength was increased, elongation and impact value decreased. In case of (J phase precipitated B specimen, tensile strength, elongation, hardness and impact value showed high value than A specimen, and impact value rapidly decreased in ealy stage.