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- 저자 : 강춘식 ( Sang Ho Choi (검색결과 3 건)
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최상호,강춘식 ( Sang Ho Choi,Choon Sik Kang ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.4
N/A The influences of some casting conditions on bonding ratio and state at bonding zone of stainless steel-cast iron dual tube produced by centrifugal casting process were investigated to estimate fabrication technics. 1) Bonding ratio is increasing such as increasing of inner surface temperature of outer metal(stainless steel STS 304), if pouring temperature of inner metal (cast iron) is constant. 2) The more pouring temperature of inner metal (cast iron) increase, the more bonding ratio increase when inner surface temperature of outer metal (cast iron) is constant. 3) As the mold rotary speed is increase, the hatching area of bonding map (perfect bonding area) goes down to the low pouring temperature of inner metal. 4) In order to predict bonding state of two different metal, we are able to make and use the bonding map about casting conditions such as inner surface temperature of outer metal, pouring temperature of inner metal and mold rotary speed.
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원심주조한 스테인리스강-주철 이중 복합관의 기계적 성질에 관한 연구
최상호,강춘식 ( Sang Ho Choi,Choon Sik Kang ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.2
N/A The influences of some casting conditions on the variation of mechanical properties of stainless steel-cast iron dual tube produced by centrifugal casting process were investigated. 1) Bonding zone thickness was increased from 0.5㎜ to 3㎜ and also bonding shear strength from 40㎏/㎟ to 50㎏/㎟ as mold rotary speed increasing from 400 rpm to 1300 rpm. 2) In case of inner metal pouring temperature from 1250℃, bonding zone thickness and bonding shear strength was increased from 0.5㎜ to 6㎜, from 40㎏/㎟ to 50㎏/㎟ repectively, but at 1250℃ pouring temperature it was abruptly decreased to 5㎏/㎟ because of imperfect bonding. 3) Microhardness of bonding zone of stainless steel-cast iron dual tube came to 590 Vicker`s hardness because the bonding zone was made into Fe-Cr-Ni-C system alloy.
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주조용 Zn-Al-2% Cu 합금의 기계적 성질과 Dendrite 형태에 미치는 Al 의 영향
최상호,강춘식 대한금속재료학회(대한금속학회) 1979 대한금속·재료학회지 Vol.17 No.6
주조용 Zn-Al-2% Cu 합금의 실험 결과로 얻어진 기계적 성질과 dendrite 형태에 미치는 영향은 다음과 같다. 1. Al 함량이 16%에서 19%, 22%로 증가함에 따라 인장강도는 33㎏/㎟, 31㎏/㎟, 29㎏/㎟로 줄어 들며 Al 함량이 22%에서 28%까지 증가함에 따라 인장강도는 37㎏/㎟까지 급증한다. 2. Al 조성 22%에서 가공경화능 표시지수 n´는 2.05이며 Al 조성의 증가 또는 감소에 따라 n´는 2.12까지 증가한다. 3. Al은 13∼22%에서 1차 dendrite의 성장을 크게하고 19%에서 가장 현저하며 그 이상의 조성에서는 1차 dendrite의 성장이 억제된다. The effect of aluminium contents on the mechanical properties and dendritic morphology in Zn-Al-2% Cu casting alloys has been investigated experimentally. The results obtained from this study are summarized as follow. 1. Tensile strength is decreased from 33㎏/㎟ to 29㎏/㎟ with the addition of 16, 19, 22% Al and increased from 29㎏/㎟ to 37㎏/㎟ with the addition of 22, 25, 28% Al. 2. Work hardening index (n´) is 2.05 in 22% Al and is increased slightly as the Al content increase or decrease from 22% Al. 3. The primary arm length of dendrite is increased with the addition of 13-22% Al and the other contents of Al constrain primary arm length growth of dendrite. 4. Tensile strength is increased with the secondary arm length increasing of dendrite
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