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3.9%C 회주철의 진동감쇠능 및 기계적 성질에 미치는 합금원소 첨가의 영향
김정철,손용철,한동운,백승한 ( J . C . Kim,Y . C . Son,D . W . Han,S . H . Baik ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.1
Flake graphite cast irons with the high damping capacity have been used for the control of vibration and noise occuring in the members of various mechanical structures under vibrating conditions. However, the damping capacity which is morphological characteristics of graphite is one of the important factors in reducing the vibration and noise, but hardly any work has deal with this problem. Therefore, the authors have examined the damping capacity of various cast irons with alloying elements and studied the influences of the matrix, mechanical properties and morphological characteristics of graphite. The main results obtained are as follows: Effects of Ni on the damping capacities and mechanical properties are investigated in 3.9%C-0.3% Cu gray cast iron. At 0.2% Ni content, specific damping capacity showed the maximum value, and decreased with further increase in Ni content, Graphite continuity also showed same behavior. This indicates that the specific damping capacity has a close relation with graphite continuity. On the other hand, the damping capacity in pearlite matrix showed superior to that in ferrite. In contrast, with increasing the Ni content, both tensile strength and hardness increased due to the decrease of graphite length and eutectic cell size.
Fe-17%Mn 합금의 진동감쇠능과 기계적 성질에 미치는 합금원소(C, Si) 및 열간압연의 영향
김정철 ( J. C. Kim ),한동운 ( D. W. Han ),백진현 ( J. H. Back ),김태훈 ( T. H. Kim ),백승한 ( S. H. Baik ),이영국 ( Y. K. Lee ) 한국열처리공학회 2005 熱處理工學會誌 Vol.18 No.2
N/A In this study, the effects of C and Si on damping capacity and mechanical properties of as-cast and as-rolled Fe-17%Mn alloys were investigated as a basic study for the purpose of the commercialization of the alloy. The M_(S) temperature of γ→ε martensitic transformation in Fe-17%Mn alloy was decreased with increasing C and Si contents, resulting in the less volume fraction of a martensite. The damping capacity was also decreased with increasing alloying content because of less s amount and the reduction in mobility of the damping sources such as the stacking fault boundaries and γ/ε interfaces due to the pinning effect by alloying elements. The mechanical properties of as-rolled alloys were superior to those of as-cast alloys probably because of finer γgrains, larger amount of ε martensite, and chemical homogeneity.
3. 6%C 회주철의 진동감쇠능 및 기계적 성질에 미치는 Sb 및 Ti 첨가의 영향
김정철(J . C . Kim),한동운(D . W . Han),백승한(S . H . Baik),최종술(C . S . Choi) 한국열처리공학회 2001 熱處理工學會誌 Vol.14 No.6
N/A Flake graphite cast irons with the high damping capacity have been used for the control of vibration and noise occurring in the members of various mechanical structures under vibrating conditions. However, the damping capacity which is morphological characteristics of graphite is one of the important factors in reducing the vibration and noise, but hardly any work has deal with this problem. Therefore, the authors have examined the damping capacity of various cast irons with alloying elements and studied the influences of the matrix structures, mechanical properties and morphological characteristics of graphite. The main results obtained are as follows: Effects of Sb on the damping capacities and mechanical properties have been investigated in 3.6%C-0.2%Ni gray cast iron. At 0.02%Sb, specific damping capacity showed the maximum value, and deceased with further increase in Sb content. Mechanical properties showed opposite trend with the damping capacity. And then, effects of Ti on the damping capacities and mechanical properties have been investigated in 3.6%C-0.2%Ni-0.02%Sb gray cast iron. Specific damping capacity increased with increase in Ti content. Graphite length also showed same behavior. Tensile strength increased with Ti content due to refinement of pearlite. In the case of 0.14%Ti addition in 3.6%C-0.2%Ni-0.02Sb cast iron, specific damping capacity and tensile strength was 36% and 25kgf/㎟ which are higher than 32% and 15kgf/㎟ at 3.6%C-0.2%Ni cast iron respectively.