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RISS 인기검색어
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- 저자 : 강세선 ( Ho Young Kwon (검색결과 4 건)
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고체탄소에 (固體炭素) 의한 철의 침탄기구에 (浸炭機構) 대한 연구
권호영,조통래,강세선 ( Ho Young Kwon,Tong Rae Cho,Sei Sun Kang ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.3
N/A The experiment was carried out for the purpose of studying the carburization of pure iron ingot and sintered iron powder by solid carbon in the atmosphere of CO gas. The volocity of carburization was estimaed by the diffusion coefficient D calculated by carburization equation. The results obtained were as follow: 1. The higher the carburization temperature, carburization depth and carbon concentration were increased, and the melting zone which had 2.8∼3.4%C at the 3∼4㎜ from interface of carburization was formed at 1300℃. 2. The main caxburization mechanism of pure iron ingot and the sintered iron powder were proceeded by CO gas up to 1100℃, solid carbon over than 1300℃, respectively. 3. The main carburization mechanism of pure iron ingot at 1200℃ was proceeded by solid carbon, and sintered iron powder was proceeded bs CO gas, however, in case the reaction time, the carburization was proceeded by solid carbon over than 5hrs. 4. The diffusion coefficient D of carbon were 0.559×10^(-6)㎠.sec^(-1) at 1100℃, 0.237×10^(-6)㎠.sec^(-1) at 1200℃, 0.087×10^(-6)㎠.sec^(-1) at 1300℃, in case of pure iron ingot carburized. 5. The diffusion coefficient D of carbon were 0.124 ㎠.sec^(-1) at 1100℃, 0.102 ㎠.sec^(-1) at 1200℃, 0.480×10^(-6)㎠.sec^(-1) at 1300℃, in the case of sintered iron carburized at the pressuring 4ton/㎠.
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강길구,박승갑,강세선,권호영,Kang, Kil-Ku,Park, Sung-Gap,Kang, Sei-Sun,Kwon, Ho-Young 한국재료학회 2002 한국재료학회지 Vol.12 No.8
In order to improve the hydrogen storage capacity and the activation properties of the hydrogen storage alloys, the rare-earth metal alloy series, MmN $i_{4.5}$M $n_{0.5}$Z $r_{x}$(x=0, 0.025, 0.05, 0.1), are prepared by adding excess Zr in MmN $i_{4.5}$M $n_{0.5}$ alloy. The various parts in hydrogen storage vessel consisted of copper pipes reached the setting temperature within 4~5 minutes after heat addition, which indicated that storage vessel had a good heat conductivity required in application. The performance test on storage vessel filled with rare-earth metal alloys of 1000 gr was also conducted after hydrogen charging for 10 min at $18^{\circ}C$ under 10 atm. It showed that the average capacity of discharged hydrogen volume was found to be for $MmNi_{4.5}$ $Mn_{0.5}$ and $MmNi_{4.5}$ $Mn_{x}$ 0.5/$Zr_{samples}$ indicated that the released amount of hydrogen for this $AB_{5}$ type alloys was more than 92 % of theoretic value, and also it was found that the optimum discharging temperature for obtaining an appropriate pressure of 3 atm was determined to be $V^{\circ}C$ for $MmNi_{4.5}$ $Mn_{0.5}$$Zr_{x}$(x=0, 0.025, 0.05, 0.1) hydrogen storage alloys. The released amount of these hydrogen storage samples was 125 $\ell$ , 122.4 $\ell$ and 108.15 $\ell$/kg for $MmNi_{4.5}$ $Mn_{0.5}$ $Zr_{0.025}$ $MmNi_{4.5}$M $n_{0.5}$Z $r_{0.05}$, and MmN $i_{4.5}$ Mn_0.5$Zr_{0}$, at $70^{\circ}C$ respectively. Amount of the 2nd phases increase with increase on Zr contents in $MmNi_{4.5}$$Mn_{0.5}$ $Zr_{ 0.1}$/ alloy. This phenomenon indicates that$ ZrNi_3$ in $MmNi_{4.5}$ $Mn_{0.5}$ $Zr_{x}$ / phase, which shows the maximum storage capacity and the strong resistance to intrinsic degradation, is considered as a proper alloy for hydrogen storage. As the Zr contents increase, the activation time and the plateau pressure decreases and sloping of the plateau pressure increases.creases.eases.s.
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과잉의 Zr을 첨가한 MmNi<sub>4.5</sub>Mn<sub>0.5</sub>Zr<sub>x</sub>(x=0, 0.025, 0.05, 0.1) 합금의 수소화특성에 관한 연구
강길구,박승갑,강세선,권호영,Kang, Kil-Ku,Park, Sung-Gap,Kang, Sei-Sun,Kwon, Ho-Young 한국재료학회 2002 한국재료학회지 Vol.12 No.8
In order to improve the hydrogen storage capacity and the activation properties of the hydrogen storage alloys, the rare-earth metal alloy series, $MmNi_{ 4.5}$$Mn_{0.5}$ $Zr_{x}$ (x=0, 0.025, 0.05, 0.1), are prepared by adding the excess Zr in $MmNi_{4.5}$ $Mn_{0.5}$ / alloy for the strong resistance to intrinsic degradation. The hydrogen storage alloys of rare-earth metal such as $LaNi_{5}$ , and $MmNi_{5}$X and $MmNi_{4.5}$ /$_Mn{0.5}$ alloys which substituted La by misch metal properties were characterized as well. The hydrogen storage alloys were produced by melting each metal mixture in arc melting furnace, and the as-cast alloys were heat-treated at $1100^{\circ}C$ for 10 hr. The major elements of misch metal(Mm) were La, Ce, Pr and Nd with some impurities less than 1wt.% determined by ICP-AES. X-ray diffraction indicated that the structure for these samples was a single phase of hexagonal with $CaCu^{5}$ type. As the Zr contents increases, the activation time and the plateau pressure decrease and sloping of the plateau pressure increase. Amount of the 2nd phases increases with increase in Zr contents in $MmNi_{ 4.5}$$Mn_{0.5}$ $Zr_{0.1}$ alloy, This phenomenon indicated that $ZrNi_3$ in this phase, which shows the maximum storage capacity and the strong resistance to intrinsic degradation, is considered as a proper alloy for hydrogen storage..
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권호영,임종호,강세선 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.5
표준시험편이란 재질, 형상, 치수 및 성능이 권위 있는 기관에 위해 검정된 국제적인 시험편을 말하며 이것은 탐상기의 특성시험 또는 감도조정, 시간축의 측정범위 조정에 사용된다. 그런데 이 표준시험편은 초음파탐상 결과에 아주 크게 영향을 미치는 하나의 변수로 ASTM 이나 JIS에서는 이들 표준시험편의 규격, 재질 및 성분 등을 엄격하게 규격화하고 있다. 그 이유는 이들 성질들이 감도와 분해능 및 재현성에 아주 큰 영향을 미치기 때문이다. 따라서 결함의 크기 및 치수를 정량화하고 재현성 있는 결과를 얻기 위해서는 엄격한 품질의 표준시험편이 요구되고 있다. 그러나 ASTM 또는 JIS등의 규격품들은 상당히 고가이며 시중에는 품질이 검증되지 않은 표준시험편들이 일부 사용되고 있는 실정에 있고 이들 시험편의 품질 및 사용 적합성을 재고하기 위하여 각종 규격에 비추어 보고, 규격품들과 비규격품의 각종 성질들을 비교하여 그 사용 안정성을 고찰하고자 하였다. 그 결과 비규격품들은 치수 및 성분에서 많은 문제점을 안고있으며 비규격품들을 검증없이 사용할 경우 피검물내의 결함의 위치나 크기 측정에 오차를 유발할 가능성을 확인하였다. Standard Test Block(STB) for UT(Ultrasonic Testing) is a block approved by authoritative for material, shape and quality. STB is used for characteristic tests, sensitivity calibration and control of the time base range of UT inspection devices. The material, size and chemical components of STB should be strictly controlled to meet the related standards such as ASTM and JIS because it has an effect upon sensitivity, resolution and reproductivity of UT. The STBs which are not approved are sometimes used because the qualified STBs are very expensive. So, the purpose of this study is to survey the characteristics, quality and usability of Non-Standardized Test Blocks. Non-Standardized Test Blacks did not meet the standard requirements in size or chemical components, and ultrasonic characteristics. Therefore if the Non-Standardized Test Blocks are used without being tested, it's likely to cause errors in detecting the location and measuring the size of the defects.
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