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남수우 대한금속재료학회(대한금속학회) 1977 대한금속·재료학회지 Vol.15 No.1
고순도철 (Ferrovac E iron)에 전기분해 방법으로 수소를 주입시키는 경우 수소 주입 기구에 대하여 조사하였다. 실험 결과로부터, 수소가 철 속으로 확산되기 위하여 철 표면에 충분한 수소 원자 농도가 형성되어야 하며 이러한 수소 농도의 형성은 불순물로 첨가된 arsenic이 비정질 상태로 시편 표면에 전착되는 현상에 영향을 받는 것으로 생각된다. Using the Ferrovac E iron specimens cathodically charged with hydrogen, investigations of the mechanism of hydrogen entry into the alpha-iron were carried out. According to the experimental results, the delaying time due to the formation of hydrogen concentration at the metal surface was investigated in terms of the amount of amorphous arsenic electrodeposited on the cathode surface.
남수우 대한금속·재료학회 2017 대한금속·재료학회지 Vol.55 No.4
For the applications in automotive, aircraft, aerospace, and electronic industries, the lightest structural Mg alloys have received much attention since 2000. There has been some progress for the improvement of the mechanical properties such as room temperature strength, formability and mechanical anisotropy. However, the high temperature strength of Mg alloys is very low to be used for the parts and structures of high temperature conditions. For the last decade, considerable efforts are concentrated for the development of Mg alloys to be used at high temperature. Newly developing Mg-RE alloys are the good examples for the high temperature use. In this regard, this review paper introduces the recent research trends for the development of Mg-RE alloys strengthened with some precipitates and the long period stacking ordered (LPSO) structures related RE elements.
원소분말압출법으로 제조된 TiAl-계 합금의 크리프 성질
남수우,황선근,김낙준,조한서 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.10
Creep properties of the lamellar structured Ti-46.6Al-1.4Mn-2Mo(at%) alloy, which is made by hot extrusion of a blended elemental powder mixture, are investigated in air environment over the temperature range from 1023K to 1173K at constant stress levels ranging from 100MPa to 250MPa. The average activation energy for creep within the temperature range from 1048K∼1173K at stress level 150MPa and 200MPa is found to tie 384kJ/㏖. The value of the stress exponent n in the range of 3.8∼4.3 was obtained within the stress range from 150MPa to 250MPa and 1.3 between 100MPa and 150MPa at 1073K. Microstructural studies conducted on creep fractured specimen showed the secondary cracks along the lamellar grain boundaries and the secondary cracks are assumed to be formed by pore nucleation, growth and coalescence during the tertiary stage.
크리프-피로 수명예측을 위한 cavity 생성인자의 소성변형 의존성
남수우,윤영철,이제민 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.8
In the previous investigations, it has been proposed that the cavities are nucleated at grain boundary due to the aggregation of the mechanically generated vacancies. For that model, the cavity nucleation factor was introduced to correlate the number of cavities and the plastic strain range from which athermal vacancies are generated. In this investigation, a discussion is proposed to clarify the characteristic property of the cavity nucleation factor for the dependence of the plastic strain range using the results of creep-fatigue test of solutionized AISI 304 and aged AISI 304 stainless steel at 873K. From the creep-fatigue test result, the effect of thermal aging is found to be beneficial relative to solution treatment, and it can be considered that the great amount of small carbides are precipitated at the grain boundaries during creep-faitgue tests in the solutionzed material, and they increase the cavity nucleation rate because they can be sites for the cavity nucleation. And, based on this result, it is found that the cavity nucleation factor is a function of the plastic strain range and the dependency is varying with the materials. Using this relation, the modified model for life prediction is suggested.