• 동력기계공학회지
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• 제14권2호
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• pp.71-77
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• 2010

This paper was studied on microstructure, mechanical properties and corrosion characteristics of 316L stainless steel pipe welds was fabricated by orbital welding process. S-Ar specimen was fabricated by using Ar purge gas and S-$N_2$ specimen was fabricated by using $N_2$ purge gas. Ferrite was not detected in weld metal of S-$N_2$ specimen but the order of 0.13 Ferrite number(FN) was detected in weld metal of S-Ar specimen. Oxygen and Nitrogen concentration of S-$N_2$ specimen was higher than S-Ar specimen on HAZ and inner bead. The welds microstructural characteristics of S-Ar and S-$N_2$ specimens are similar. The microvickers hardness values of S-Ar and S-$N_2$ specimens welds were similar and average values of each regions were in the range of 174~194. The microstructures of S-Ar and S-$N_2$ weld metal were full austenite by primary austenite solidification. The Solidification structures of S-Ar and S-$N_2$ weld metal were formed directional dendrite toward bead center. The potentiodynamic polarization curve of STS 316L pipe welds exhibited typical active, passive, transpassive behaviour. Corrosion current density$(I_{corr.})$ and corrosion rate values of S-Ar specimen in 0.1M HCl solution were $0.95{\mu}A/cm^2$ and $0.31{\mu}A$/year respectively. The values of S-$N_2$ specimen were $1.4{\mu}A/cm^2$ and $0.45{\mu}m$/year.

• 한국결정성장학회지
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• 제14권1호
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• pp.21-26
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• 2004

HPHT(고온고압) 처리된 type IIa 다이아몬드의 분광분석 결과를 나타내었다. 그리고 HPHT 처리된 다이아몬드 spectrum의 특성을 이와 유사한 color와 type을 가진 처리되지 않은 다이아몬드와 비교하였다. 325nm 에서 여기된 He/Cd laser로는 HPHT 처리된 다이아몬드와 처리되지 않은 다이아몬드에 현저한 변화가 있음을 알 수 있었는데 이는 HPHT 처리된 다이아몬드의 spectrum에서 H3, H4에 관련된 peak가 제거되고 N3 system에 관련된 peak의 emission이 증가함을 보여 주었다. 또한 514nm에서 여기된 Ar-ion laser로 측정된 spectrum은 575nm와 637.1 nm에서 Nitrogen과 vacancy가 관련되어있는 N-V center가 발견 되었는데 이러한 center가 존재하고 있을 경우 637.1 nm의 FWHM의 값은 HPHT 처리된 다이아몬드와 처리되지 않은 다이아몬드를 구분할 수 있음을 보여주었다. 본 실험에서 측정된 HPHT 처리된 다이아몬드의 637.1nm $(N-V)^-$의 FWHM 값은 $19.8{\textrm}{cm}^{-1}$에서$32.1{\textrm}{cm}^{-1}$였다.

• Structural Engineering and Mechanics
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• 제55권4호
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• pp.765-784
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• 2015

Connections are usually designed either as pinned usually associated with simple construction or rigid normally is associated with continuous construction. However, the actual behaviour falls in between these two extreme cases. The use of partial strength or semi-rigid connections has been encouraged by Euro-code 3 and studies on semi-continuous construction have shown substantial savings in steel weight of the overall construction. Composite connections are proposed in this paper as partial or full strength connections. Standardized connection tables are developed based on checking on all possible failure modes as suggested by "component method" for beam-to-column composite connection on major axis. Four experimental tests were carried out to validate the proposed standardised connection table. The test results showed good agreement between experimental and theoretical values with the ratio in the range between 1.06 to 1.50. All tested specimens of the composite connections showed ductile type of failure with the formation of cracks occurred on concrete slab at maximum load. No failure occurred on the Trapezoidal Web Profiled Steel Section as beam and on the British Section as column.