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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.
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.