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크롬탄화물형 크롬백철 오버레이 용착금속에서의 $(Cr,\;Fe)_7C_3$의 경도특성
백응률,Baek Eung-Ryul 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.2
The effect of chemical constituents of $(Cr,\;Fe)_7C_3$ carbide phase on its hardness in the chromium-carbide type Cr white iron hardfacing weld deposits has been investigated. In order to examine $(Cr,\;Fe)_7C_3$ carbide phase, a series of filler metals with varying chromium contents was used. The alloys were deposited once or twice on a mild steel plate using the self?shielding flux cored arc welding process. The hardness of $(Cr,\;Fe)_7C_3$ carbide phase was measured by the micro-Vickers hardness test. It was shown that hardness of $(Cr,\;Fe)_7C_3$ carbide phase increased with increasing Cr content in $(Cr,\;Fe)_7C_3$ carbide phase. This behavior of the hardness of $(Cr,\;Fe)_7C_3$ carbide phase was explained by the types of chemical bonds that hold atoms together in $(Cr,\;Fe)_7C_3$ carbide phase.
재활용 산화철 및 알루미늄 분말을 활용한 철도레일 이음용 테르밋 분말 개발
최상규,박성상,백응률,Choi, Sang-Kyu,Park, Sung-Sang,Baek, Eung-Ryul 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.5
Nowadays in Republic of Korea, whole amount of the thermite welding powder for rail joinning is dependent on import. However the demand of the thermite welding powder would be enlarge because some constructing high-speed train and city metro projects are currently in progress. In addition this is the main reason why we should develop the thermite welding powder, domestically. This study is focused on utilizing the recyclable materials like Al powders from cans and iron oxide scales from wire rods as the main components of the thermite welding powder. By minimizing Al content in weld zone by controlling the mixing ratio of the Al powder in the thermite welding powder, the excessive dissolution of the Si and Mn components came from the Al powders could be controled. The tensile strength of welding zone in welded rail was 740 MPa, with that the developed thermite welding powder.
새로운 420계 스테인리스강 스트립재를 이용한 일렉트로슬래그 클래딩에서 용착거동에 미치는 용접공정변수의 영향과 화학성분의 변화
정재영(Jae-Young Jung),백응률(Eung Ryul Baek) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.6
In this study, the overlay welding behaviors were evaluated by electroslag strip cladding process using a new 420-series stainless steel strip to obtain a mesh welded structure according to welding process parameters such as welding current, welding voltage, welding speed. Increasing the welding current in the range of 800- 1400A shows that the width of weld metal, depth of penetration, amount of deposition and flux consumption tend to increase. In particular, the maximum penetration value is somewhat reduced to about 1000A, but becomes almost constant at more than 1000A. Increasing the welding voltage in the range of 24- 36V resulted in a decrease in the deposition amount and a slight increase in the flux consumption, but the width of the deposited metal and the penetration depth showed maximum at about 30V. When the welding speed was increased from 12.7cm/min to 38.1cm/min, the width and amount of weld metal, and flux consumption decreased and penetration depth increased. The characteristics of the deposited metal and flux could be generalized by using a combined variable called heat input. Dilution decreased with increasing heat input and HAZ depth increased. C, Mo, and V in the chemical composition of the deposited metal were almost equal to the calculated values. W, Ni, Si, P, and N were measured to have higher values than the calculated values. Cr, Mn, Cu, Nb, Al and S were measured to have lower values than the calculated values.
철도레일 테르밋 용접부의 기계적 특성 향상 방안에 관한 연구
최상규(Sang-kyu Choi),박성상(Sung-Sang Park),백응률(Eung-Ryul Baek),전봉길(Bong-Gil Chun) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
It is reported that about more than 45% of damage shown in railroad rails include breakage of rail end which cross the center of Thermit welded zone. Thermite welding is always accompanied by numerous aluminum oxide and secondary inclusions which may have a negative influence on the ductility and toughness of the weld metal. In this study the aluminum powder recycled by waste aluminum can was used for iron oxide generated after the process of welding rod and the remain aluminum was reduced by minimizing the quantity of aluminum. And complete dissolution was induced by using ferro Mn powder as the additive element. This study reviewed the applicability of heat treatment in the welded zone of rail using ceramic heating pad by carrying it out. This study could observe the improvement of the mechanical characteristics (UTS and elongation) and the changes of failure mechanism from brittleness to ductility. It could be found that improved strength and elongation result from pearilte fine structure.