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25Cr-7Ni-4Mo 수퍼 2상 스테인리스강의 충격인성에 미치는 χ상의 영향
김창룡 ( C Y Kang ),한현성 ( H S Han ),이상희 ( S H Lee ),한태수 ( T S Han ) 한국열처리공학회 2012 熱處理工學會誌 Vol.25 No.2
This study has been carried out to investigate the precipitation behavior of x phase and effect of x-phase precipitation on the impact toughness of 25%Cr-7%Ni-4%Mo super duplex stainless steel. It was proved that the x phase was a inter metallic compound, which represented the higher chromium and molybdenum concentration than the matrix phases, and also showed the higher molybdenum concentration than the σ phase, The x phase was precipitated at the interface between ferrite and austenite or inside the ferrite matrix in the early stage of aging, The number of x phase precipitates increased with increasing aging time, however, after showing the maximum value, the number was decreased due to the gradual transformation of x phase into σ-phase. Aging ferrite phase was decomposed by the y2 phase and σ-phase. Impact toughness rapidly decreased with time in the initial stage of aging at x phase start to precipitate. Thus, the impact toughness was greatly influence for the precipitation of x phase.
김윤규(Y. K. Kim),박영태(Y. T. Park),이종문(J. M. Lee),김창규(C. K. Kim),김창룡(C. Y. Kang) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
The effect of Austempering and sub zero treatment on the dmping capacity in austempered ductile cast iron was investigated. Damping capacity of austempered ductile cast iron was rapidly increased by austempering treatment ,but austempering temperature and time had no effect on Damping capacity of austempered ductile cast iron. Austenite transformed to martensite by subzero treatment, and with decrease in subzero treatment temperature, volume fraction of martensite increased. Damping capacity of austempered ductile cast iron was increased by subzero treatment, with decreasing of subzero treatment temperature, damping capacity increased. With decrease in subzero treatment time, damping capacity rapidly increasing up to 30min. and then slowly increased. With increase in volume fraction of martensite, damping capacityra pidly increased up to 5% and then slowly increase.