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Fe-18wt%Mn 마르텐사이트 합금에서 주조상태와 열처리한 상태의 기계적 성질과 진동감쇠능에 관한 연구
백승한,김정철,지광구,신명철,최종술 ( S . H . Baik,J . C . Kim,K . K . Jee,M . C . Shin,C . S . Choi ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.3
In recent work, we reported that a hot-rolled Fe-18wt%Mn alloy exhibited high damping capacity as well as excellent mechanical properties. It was also proposed that damping capacity of the alloy was proportional to the γ/ε boundary area. In the present study, the effects of homogenization(12hrs at 1100℃) and solution treatment(1hr at 1050℃ before air cooling) on damping capacity and mechanical properties were investigated for as-cast and heat treated Fe-18wt%Mn alloy. The specimen subjected to both homogenization and solution treatment was found to show superior damping capacity and mechanical properties to the as-cast state due to removal of segregation and increase in γ/ε boundary area.
Fe-17wt%Mn 합금의 진동감쇠능에 미치는 탄소와 티타늄 첨가의 영향
백승한,김정철,지과구,신명철,최종술 ( S . H . Baik,J . C . Kim,K . K . Jee,M . C . Shin,C . S . Choi ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.1
Effects of carbon and Ti on damping capacity are investigated in an Fe-17%Mn alloy. The suppressive force of carbon against γ→ε transformation increases linearly with an increase in its content, lowering Ms temperature and volume fraction of ε martensite. Carbon deteriorates damping capacity by reducing the interfacial area of damping sources and mobility of the boundaries contributing to anelastic deformation. The reduction in damping capacity is accelerated when carboncontaining alloy is aged at higher temperatures above room temperature. The effect of Ti on damping capacity is found to be benificial in carbon-containing alloy, which is attributed to the depletion of carbon solute due to the formation of TiC.
Fe-Mn 이원계에서 비열탄성형 BCC 마르텐사이트와 HCP 마르텐사이트의 진동감쇠능
최종술,김준동,문인기,백승한 ( C . S . Choi,J . D . Kim,I . G . Moon,S . H . Baik ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.4
The damping capacities of the nonthermoelastic bcc type lath martensite and of the nonthermoelastic hcp type thin plate martensite in Fe-Mn alloys were studied. Fe-17%Mn alloy showing the hcp type thin plate martensite was superior to Fe-4%Mn alloy having the bcc type lath martensite in damping capacity. The damping capacity of the Fe-17%Mn alloy became greater with increasing the hcp martensite volume fraction. The damping mechanism of the Fe-4%Mn alloy was well explained by the dislocation model. However, the damping mechanism of the Fe-17%Mn alloy was explained on the basis of austenite/martensite interface moving model. The two alloys showed almost same levels of tensile strength. However, the elongation was greater in the Fe-17%Mn alloy than in the Fe-4%Mn alloy, showing lower yield strength in the former than in the latter. This result was considered to be attributed to formation of stress-induced martensite during tension test.
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.
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.
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.