• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1996.03a
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• pp.159-164
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• 1996

For the purpose of establishing laser welding condition(laser power, welding speed and beam focus) and of evaluating tailor welded blank for three kinds of thin steel sheets of SPCC, SK5M and SUS304 using in the thin plate structure such as automobile, train and so on. Their $CO_2$ laser weldability were primarily tested under various welding condition. SPCC and SUS304 thin sheets showed good weldability under some welding condition. But, high carbon steel sheet SK5M needs heat treatment after welding to obtain higher tensile strength and ductility of the welded joint. And next, laser welding condition. Butt-welded specimens were not nearly broken at weld bead. However, base material were ruptured in the direction of circumference. The forming depths by tailor weld bead. However, base material were ruptured in the direction of circumference. The forming depths by tailor welded blank were SPCC+SPCC=22~25mm, SUS304+SUS304=25~43mm and SK5M+SK5M=13~17mm.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.05a
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• pp.119-120
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• 2015

SUS316L의 내부식성을 증진시키기 위해 우수한 내부식성 합금원소로 알려진 Al, Cr을 SUS316L에 Sputtering, E-beam evaporation하여 Al, Cr 코팅층을 형성시킨 후 대기 중, $Ar-1%SO_2$ 분위기에서 부식시켰다. 그 결과 코팅층에 의해 $600^{\circ}C$까지 $Al_2O_3$, $Cr_2O_3$ 형성되어 보호피막 역할을 함으로써 내부식성이 증진되었다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.20 no.11
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• pp.1000-1003
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• 2007

The molten carbonate fuel cell has conspicuous feature and high potential in being used as an energy converter of various fuel to electricity and heat. However, the molten carbonate fuel cell which use strongly corrosive molten carbonate at $650^{\circ}C$ have many problem. One of the material problems is the severe corrosion of the metallic components, such as the separator. The effect of coating and annealing treatment on the corrosion for SUS 304 and SUS 430 which are the candidate materials for molten carbonate fuel cell hardware has been investigated in molten carbonate at $650^{\circ}C$ by using steady state polarization and electrochemical impedance spectroscopy method. It was found that the corrosion current of these SUS 304 and SUS 430 decreased with coating and annealing treatment.

• Journal of Welding and Joining
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• v.1 no.2
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• pp.61-68
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• 1983

Austenitic stainless steel has been investigated widely for creep strength of heat resistant material and effects of grain sizes due to various solution treatment time under constant temperature. It was studied that effects of grain sizes subject to solution treatment temperature 1100.deg. C, 1125.deg. C, 1175.deg. C, 1250.deg C, and 1300.deg. C respectively on the creep strength, fracture behaviour and fractography of SUS 316 stainless steel. The experimental results obtained were as follows. 1. The optimum grain size for the maximum creep strength did not vary with creep testing temperatures and stress levels. 2. Among various grain sizes due to different solution treatment temperature, the optimum grain size for the creep strength was found 0.044mm. Also the size showed the minimum initial strain regardless creep temperature. 3. Garofalo's equation of creep rupture life was applied well to SUS 316 stainless steel. 4. The fractography of optimum size was ductile intergranular fracture of dimple type and showed along with the increase of grain size intergranular fracture of w type.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2009.10a
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• pp.165-166
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• 2009

이 연구에서는 SUS304 기판과 Cr-Al-Si-N 코팅사이의 밀착특성을 향상시키기 위하여 하이브리드 증착법으로 Cr Interlayer를 기판위에 증착시킨 후 Cr-Al-Si-N 코팅을 증착하였다. 그리고 Ball-on-disk 마모테스트와 스크래치 테스트를 통해 밀착력, 파괴기구, 그리고 마찰거동 등을 살펴보았다. Cr-Al-Si-N 코팅에 60nm 두께의 Cr Interlayer 삽입되었을 때는 기판에 Cr-Al-Si-N 코팅만 증착되었을 때의 밀착력(${\sim}30N$) 보다 더 우수한 ${\sim}50N$의 밀착력을 나타내었고 내마모성 또한 향상되었다. 밀착력 증가는 Cr Interlayer 삽입에 따른 SUS304 기판과 Cr-Al-Si-N 코팅사이의 전단응력 감소에 기인한 것으로 사료된다.

• Iberoamérica
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• v.14 no.1
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• pp.111-142
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• 2012

Rodolfo Walsh es historiador de su propio tiempo, protagonista y testigo que escribió para dar testimonio. Sus obras pertenecen a un instante, a la historia. El escritor habla en nombre de la verdad y denuncia los manejos del poder. El trata de desmontar y hacer la crítica de la escritura oficial y sus medios, lo que trae como consecuencia el develamiento del funcionamiento del aparato de Estado en América Latina. Sus obras que marcan la historia trágica de Argentina tienen un alto nivel de calidad. Para él la ficción es el arte de la elipsis y trabaja con la alusión, y su construcción es antagónica con la estética urgente del compromiso y las simplificaciones del realismo social. Este trabajo tiene como objeto investigar las estrategias narrativas de Rodolfo Walsh a través de las tres obras principales (Operación Masacre, ¿Quién mató a Rosendo?, Esa mujer), y revelar la visión del mundo que nos muestra. Al fin podremos saber la estructura significativa representada en sus obras.

• Proceedings of the Materials Research Society of Korea Conference
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• 2008.11a
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• pp.39.2-39.2
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• 2008

• Proceedings of the KWS Conference
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• 2000.10a
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• pp.94-97
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• 2000

• Proceedings of the Materials Research Society of Korea Conference
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• 2001.05a
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• pp.44-44
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• 2001

• Proceedings of the KWS Conference
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• 2006.05a
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• pp.100-102
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• 2006