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Al-Si 합금의 CFR 과 MDE 에 미치는 냉각속도의 영향
권혁무,김수영 ( Hyuk Moo Kwon,Soo Young Kim ) 한국주조공학회 1984 한국주조공학회지 Vol.4 No.4
In order to clarify the solidification mechanism of Al-Si alloy, Mushy Degree of Eutectic Solidification (MDE) and Centerline Feeding Resistance (CFR) were systematically studied by casting with various compositions of Al-(6∼18%) Si alloys into several kinds of molds having different cooling rates. The results are as follows: 1. CFR% increases slightly as solute concentration increases, but decreases remarkably as the cooling rate of the mold increases, that is, the composition dependence of the alloys has more effect on the change of CFR% than that of the mold cooling rate. 2. The composition dependence of MDE value has the same tendency as that of Degree of Eutectic Solidification (DES). MDE value within the range of hypereutectic composition is larger than that of hypoeutectic and it represents the maximum value at eutectic composition. The higher the cooling rate is, the less the MDE value is.
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Bainite 球狀黑鉛鑄鐵의 磨滅特性에 미치는 殘留Mg의 影響
權赫茂,朴相俊,金水泳 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.2
Bainite spheroidal graphite cast iron specimens of 0∼0.054wt % residual Mg were casted into a green sand mold, 25 mm thickness Y-block. The microstuctures of the castings were studied for mechanical properties and abrasion characteristics. The results obtained from this study are summerized as follows: 1) Under the present expermental conditions, the relation between the abrasion speed and the abraded amount are; 0.5m/sec for 1^st abrasive wear and 2.38m/sec for 2^nd abrasive wear. 2) Increasing the residual Mg, the first abrasion speed for 2nd abrasive wear moved to the low abrasion speed. 3) The maximum amount of abraded material during 2^nd abrasive wear decreases with the increasing residual Mg content, and moves to the high abrasion speed as the residual Mg is increased over 0.042 wt %. 4) The amount of abraded materials increases with the decreasing residual Mg at abrasion speed 2.38 m/sec and with the increasing residual Mg at abrasion speed 0.62∼1.14 m/sec. 5) Increasing the abrasion speed, abrasion mechanisms are as follows; ⓐ 1^st abrasive wear ⓑ 1^st corrosive wear ⓒ 2^nd abrasive wear ⓓ 2^nd corrosive wear. But, Under the present expermental condition the adhesive wear mechanism didn't appear.
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과공정 Al-Si 합금에서의 초정규소 미세화처리의 효과에 대하여
김수영,장충근,권혁무 대한금속재료학회(대한금속학회) 1974 대한금속·재료학회지 Vol.12 No.1
過共晶 Al-Si 合金의 初晶珪素의 微細化處理가 이 합금의 기계적성질에 미치는 영향을 조사 검토하였다. 특히 Al-Si 합금에서 가장 널리 사용되는 소량의 Ni, Cu, Mg 元素 및 熱處理와의 관계를 구명하여 다음과 같은 결론을 얻었다. 1) 初晶珪素의 微細化處理는 硬度를 증가시키지 못할 뿐만 아니라 오히려 약간의 감소의 경향이 있다. 2) 初晶珪素의 微細化處理는 여하한 경우에도 引張强度를 증가시킨다. Effects of the refinement of primary silicon on the hardness and the tensile strength of hypereutectic Al-Si alloy are investigated in this study. Especially the relationship between the refinement and Ni, Cu, Mg elements, which are used usually in the alloy, and effects of heat-treatments, have been studied. The results obtained are as follows : 1) The refinement of primary silicon can not increase the hardness of the alloy, but decreases it. 2) The refinement of primary silicon increases the tensile strength at any case.
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長忠根,權赫茂,金水泳 충남대학교 자연과학연구소 1975 學術硏究誌 Vol.2 No.2
Liquid nitriding is being used for machine parts to improve fatigue strength and resistance to wear and seizure in carbon steel. The difference in matrixes with pearlitic, troostitic or martensitic structure in carbon steel has an important effect on nitriding. In the present work, carbon steel with different matrixes were nitrided by a liquid nitriding process at 570℃ for 1-8 hrs for a basic study on the nitriding of carbon steel. A white compound layer and diffusion zone were obtained by nitriding. The compound layer consisted of ε(Fe_(2-3)N) and r'(Fe₄N) nitrides. The total nitrided depth '(compound layer + diffusion zone) in the troostitic steel was greater than those of other steels cwing t o the high diffusion velocity of nitrogen. The relationship between surface hardness and nitriding time can be obtained as follows: In pearlite + ferritic matrix, hardness of surface increased from 210Hv to 640 Hv for 1 hr nitriding time and then decreased do 350Hv and 320 Hv for 4 and 8 hrs of nitriding time, respectively. In martensitic matrix, hardness of surface decreased from 819 Hv to 380 Hv for 1 hr nitring time and then increased slowly to 650 Hv for 5 hrs nitriding time.
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