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전위와 질화물의 상호작용이 12%Cr-15%Mn 오스테나이트강의 고온변형거동에 미치는 영향
배동수(DONG-SU BAE) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.3
The objective of research is to clarify the interaction between dislocations and precipitates during high temperature creep deformation behaviors of high Mn austenitic steels. After measuring the internal stress in minimum creep rate state under applied stress of 236㎫ at 873K, a transmission electron microscope (TEM) observation was performed to investigate the interaction between dislocations and precipitates during high temperature creep deformation. The band widths and values of internal stress increased when the nitride precipitates distribute more densely. Fine nitrides disturbed the dislocation movement with pinning the dislocations and perfect dislocations were separated into Shockley partial dislocations by fine nitrides. Coarse nitrides disturbed the dislocation movement with climb mechanism.
가속냉각처리한 API-X70강의 미세조직과 기계적 특성에 미치는 구상화 열처리시간의 영향
배동수 ( Dong-su Bae ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.5
The purpose of this study was to investigate the effect of spherodizing heat treatment holding time on the microstructure and mechanical properties of the accelerated cooling-treated API X70 steel, which is mainly used as a structural material for line pipe steel for natural gas pipes. The accelerated cooling-treated API X70 steel was spherodizing treated at 700°C for 12~48 h. The microstructure was observed using an OM and a FEG-SEM, and mechanical properties were obtained by tensile test. The microstructure of the API X70 steel was banded in the hot rolling direction, and the polygonal ferrite(PF) adjacent to pearlite(P) has mainly a fine size, and coarse PF and fine acicular ferrite were formed in the middle of P and P. As the spherodizing treatment time increased, the number of carbide particles decreased and its distribution interval increased, and the ferrite grain size was coarsened. The tensile strength decreased and the ductility increased with spherodizing treatment time, and the yield point elongation was disappeared in a stress-strain curve after the spherodizing treatment.
시효한 STS304 모재부의 기공형성과 조사유기편석에 미치는 He 사전 주입의 영향
배동수 ( Dong Su Bae ),정호신 ( Ho Shin Jeong ),( Heishichiro Takahashi ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.7
The matrix part of aged STS304 has been irradiated up to 5.4 dpa at 673 K using 1,250 keV highvoltage electron-microscopy (HVEM) connected with an ion accelerator, to study the effect of He pre-injection on microstructural evolution. Two types of irradiation modes were used in this study. The first mode used single electron-beam irradiation and the second mode used electron-beam irradiation after He pre-injection. Thin-disc samples were prepared from the matrix part of STS304 aged at 673 K for 1,000 h. Irradiationinduced- segregation analyses were carried out by an energy-dispersive X-ray analyzer (EDX) in a 200 keV field- emission transmission electron microscopy (FE-TEM) with a beam diameter of about 0.5 nm. The mean size of voids increased considerably and their distribution was bi-modal, when the electron-beam was used after He-injection. Void-number density, sink strength and swelling percentage of samples subjected to electron-beam irradiation after He-injection were larger than those subjected to single electron-beam irradiation. Compared to single electron-beam irradiation, the amount of grain boundary segregation was suppressed for electron-beam irradiation after He-injection. †(Received October 29, 2013)
배동수 ( Dong-su Bae ),이진경 ( Jin-kyung Lee ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.5
In this study, in the selection of materials for the elements of a small plant, those with high resistance to corrosion are selected and the material properties of coatings for corrosion prevention are evaluated. In addition, corrosion characteristics and material analysis were performed on the welded part, and the hardness characteristics of the welded part, heat-affected part, and the base metal were evaluated. In the case of the post-weld-heat-treated(PWHT) specimen, the corrosion resistance of STS 316 was lower than that of the specimen without the PWHT due to the formation of intergranular carbide. As a result of evaluating the distribution of the hardness of the weld before and after the PWHT, the hardness of the specimen after the PWHT increased by about 20 Hv. As a result of the corrosion test on the welded specimen, the weight loss tended to increase as the time increased. In the case of the PWHT specimen, the corrosion resistance tended to be significantly lower than that of the specimen without PWHT due to the formation of intergranular carbide.
STS/Al/Cu 클래드재의 파괴거동 및 기계적 물성에 미치는 인장시험 온도의 영향
배동현 ( Dong Hyun Bae ),최영준 ( Young Jun Choi ),정원섭 ( Won Sub Chung ),배동수 ( Dong Su Bae ),조영래 ( Young Rae Cho ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.12
In order to meet increasingly complex and rigorous technical specifications, extensive effort has been devoted to fabricate clad materials with multi-layered metal plates. In this study, novel stainless steel/aluminum/copper (STS/Al/Cu) three-ply clad materials were fabricated by a hot rolling process for cookware applications. The effect of the testing temperature on the mechanical properties of the clad materials and on each component metal was investigated during the tensile tests. The interface properties of the clad materials were also examined by optical microscopy (OM) and an electron probe micro-analyzer (EPMA). The best mechanical and interfacial properties for a warm working process were found in a sample annealed at a temperature of 300℃. For the sample annealed at 400℃, the results of the tensile test indicated that interface delamination occurred only in the region of the Al/Cu interfaces. This was due to the formation of the thick and brittle intermetallic compound of Al2Cu in the Al/Cu interface. In contrast, no interface delamination was observed in the STS/Al interface, most likely due to its strong bond strength.
Ti/Al/STS 클래드재의 접합특성에 미치는 예비 열처리의 영향
배동현 ( Dong Hyun Bae ),정수정 ( Su Jung Jung ),조영래 ( Young Rae Cho ),정원섭 ( Won Sup Jung ),정호신 ( Ho Shin Jung ),강창룡 ( Chang Yong Kang ),배동수 ( Dong Su Bae ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.9
Titanium/aluminum/stainless steel(Ti/Al/STS) clad materials have received much attention due to their high specific strength and corrosion-resisting properties. However, it is difficult to fabricate these materials, because titanium oxide is easily formed on the titanium surface during heat treatment. The aim of the present study is to derive optimized cladding conditions and thereupon obtain the stable quality of Ti/Al/STS clad materials. Ti sheets were prepared with and without pre-heat treatment and Ti/Al/STS clad materials were then fabricated by cold rolling and a post-heat treatment process. Microstructure of the Ti/ Al and STS/Al interfaces was observed using a Scanning Electron Microscope(SEM) and an Energy Dispersed X-ray Analyser(EDX) in order to investigate the effects of Ti pre-heat treatment on the bond properties of Ti/ Al/STS clad materials. Diffusion bonding was observed at both the Ti/Al and STS/Al interfaces. The bonding force of the clad material with non-heat treated Ti was higher than that with pre-heat treated Ti before the cladding process. The bonding force decreased rapidly beyond 400℃, because the formed Ti oxide inhibited the joining process between Ti and Al. Bonding forces of STS/Al were lower than those of Ti/Al, because brittle Fe3Al, Al3Fe intermetallic compounds were formed at the interface of STS/Al during the cladding process. In addition, delamination of the clad material with pre-heat treated Ti was observed at the Ti/Al interface after a cupping test.
C/SiC 복합재의 기계적 특성에 미치는 초기 기공의 영향
손동영(Son Dong-Young),배동현(Bae Dong-Hyun),손용규(Son Young-Gyu),배동수(Bae Dong-Su) 동의대학교 정보통신연구소 2004 정보통신연구지 Vol.5 No.-
Four kinds of raw C/C composites with a density between 1.2S-1.66g/cm² were used in order to investigate the effect of the initial porosity of C/C composites on mechanical properties of liquid silicon infiltrated C/SiC composites. The microstructure observation, image analysis and flexural strength test of the composites were performed. The density and microstructural changes with the variation of the initial porosity was discussed in the terms of the infiltration behavior of liquid silicon.