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Fe-32 % Ni 합금에서 마르텐사이트의 재결정 거동
손인진,최종술 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.4
Recrystallization behavior of martensite of Fe-32%Ni alloy has been studied with hardness measurement method. Hardness vs. temperature curves at all deformation degrees consist of two steps: first step is due to reverse transformations from martensite to austenite, and second step recrystallizations of reversed austenites. Recrystallization of martensite necessarily occurs after reverse transformation from martensite to austenite, and the recrystallization temperature is decreased with increasing deformation degree. Activation energy for recrystallization is also decreased with increasing deformation degree. From the discussion of the activation energy, it is suggested that the recrystallization is controlled by nucleation process. Reverse transformation temperature (As) becomes higher as the deformation degree is increased.
Fe-27%Ni-0.27%C 합금의 마르텐사이크 변태온도와 형태에 관한 연구
손인진,김환철,김학신 ( In Jin Shon,Hwan Cheol Kim,Hak Shin Kim ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.3
This work was carried out in order to investigate the effect of grain size on martensitic transformation temperature and morphology of Fe-27%Ni-0.27%C alloy. The martensitic transformation temperature was raised with increasing the austenitizing temperature within the range from 750℃ to 1200℃, owing to the grain growth, vacancy concentration. It was observed that the larger was the austenite grain, the higher was the martensitic transformation temperature. The influence of the austenite grain size was similar to that of the austenitizing temperature. The morphology of martensite in Fe-27%Ni-0.27%C alloy changed from lath to lenticular with the variation of grain size. From the above results, it was concluded that the martensitic transformation temperature and morphology was mainly dependent upon the austenite grain size.
손인진,김학신 ( I . J . Shon,H . S . Kim ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.2
The effects of heating rate on the combustion temperature, the ignition temperature, the microstrurcture and the shape memory ability of products formed by combustion were investigated. The ignition temperature decreased with increasing heating rate. Combustion temperature and ΔT(difference temperature between the ignition temperature and the combustion temperature) increased with increasing heating rate. The grain size of the product increased with increasing heating rate. Combustion synthesis did not completely occur below the heating rate of 10℃/min. NiTi intermetallic compound was completely formed at the heating rate of 600℃/min and the product by combustion method had a good shape memory effect.
Fe-Ni합금의 마르텐사이트 변태온도 (Ms)와 역변태온도 (As)에 미치는 역성가공의 영향
손인진,남기석 한국열처리공학회 1990 熱處理工學會誌 Vol.3 No.4
This research has been performed in order to investigate the effect of prior deformation on the Ms temperature and reversed As of Fe-Ni alloy. The Ms temperature rose with increment of strain to 30% but lowered over 50%. It can be analysed that martensitic transformation was promoted by partial dislocation in low strain, but suppressed by dislocation cell structures in high strain. The As temperature was substantially increased with higher deformation to 20% but slowly above 50%. It may be caused that as the transition bands formed by deformation constrained shear strain, therefore austenitic transformation was hindered.
손인진,곽승미 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.6
ZrO2 powders were high-energy ball milled for various durations and consolidated using the high-frequency induction heated sintering (HFIHS). The effect of milling on the sintering behavior and crystallite size ZrO2 powders were evaluated. A nanostructured dense ZrO2 compact with a relative density of up to 96% was readily obtained within 1 min. The ball milling effectively refined the crystallite structure of ZrO2 powders and facilitated the subsequent consolidation. The sinter-onset temperature was reduced appreciably by the prior milling for 10 hrs. Accordingly, the relative density of ZrO2 compact increased as the milling time increases. The microhardness and fracture toughness of sintered ZrO2 increased as the density increases.
Fe-32% Ni 합금에서 처녀오스테나이트와 역변태 오스테나이트의 재결정온도
손인진,최종술 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.7
Recrystallization temperatures of original austenite and reversed austenite have been investigated in Fe-32%Ni alloy. The former was formed by diffusional transformation, and the latter by diffusionless transformation, At the same levels of deformation degree, the recrystallization temperatures were higher in the original austenite than in the reversed austenite. At the same levels of hardness, however, the recrystallization temperatures were higher in the reversed austenite than those in the original austenite. This is because the cells are smaller and the walls of the cells are thicker in the original austenite than in the reversed austenite, in addition to the difference in vacancy concentration between them, at the same levees of Hardness.
손인진,도정만,윤진국,두송이 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.1
Nanopowders of Al2O3, TiO2 and MgO were fabricated by high energy ball milling. The simutaneous synthesis and sintering of nanostuctured MgAl2O4-Mg3Al4Ti3O25 composite was investigated by the pulsed current activated sintering process. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition of grain growth. A highly dense nanostructured MgAl2O4-Mg3Al4Ti3O25 composite was produced with the simultaneous application of 80 MPa pressure and a pulsed current of 2000A within one minute. The grain sizes and mechanical properties of MgAl2O4- Mg3Al4Ti3O25 composite sintered at 1150℃ were investigated.
Properties and Rapid Sintering of a Nanostructured Tetragonal Zirconia Composites
손인진,윤진국,홍경태 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.5
4YSZ is generally used as oxygen sensors, fuel cells, thermal barrier and hip and knee joint replacements as a resultof these excellent properties with its high biocompatibility, low density, good resistance against corrosion, highionic conductivity, hard phase and melting point. However, 4YTZ with coarse grain has low resistance to wear andabrasion because of low hardness and low fracture toughness at room temperature. The fracture toughness andhardness of a 4YTZ can be improved by forming nanostructured composites and addition of a second hard phase. In this study, nanostuctured 4YTZ-graphene composites with nearly full density were achieved using high-frequencyinduction heated sintering for one min at a pressure of 80 MPa. The rapid consolidation and addition of graphene to4YTZ retained the nano-scale structure of the ceramic by inhibiting grain growth. The grain size of 4YTZ wasreduced remarkably by the addition of graphene and the addition of graphene to 4YTZ greatly improved the fracturetoughness without decrease of hardness.
손인진 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.9
Tungsten carbides are primarily used as cutting tools and abrasive materials in the form of composites with a binder metal,such as Co or Ni. However, these binder phases have low corrosion resistance compared to the carbide phase and the high costof Ni or Co. Therefore, the drawbacks of the WC-Ni and WC-Co cermets have generated interest in recent years foralternative binder phases. In this study, TiAl3 was used as a novel binder and consolidated by the high-frequency inductionheated sintering (HFIHS) method. The advantage of this process is not only rapid densification to near theoretical density butalso the prohibition of grain growth in nano-structured materials. Highly dense WC-TiAl3 with a relative density of up to98% was obtained within one min by HFIHS under a pressure of 80 MPa. The microstructure and the mechanical properties(hardness and fracture toughness) of the sintered WC and WC-TiAl3 were investigated.
손인진,권한중,Hyun-Su Oh 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
Commercial AlN powders were high-energy ball milled for various durations, and consolidated without a binder, using the high-frequency induction heated sintering method (HFIHS). The effect of milling on the sintering behavior, crystallite size and mechanical properties of AlN compacts were evaluated. A dense AlN compact with a relative density of up to 96% could be readily obtained within 1 min. The ball milling effectively refined the crystallite structure of AlN powders, and facilitated the subsequent densification. The sinter-onset temperature was reduced appreciably, by the prior milling for 10 h from 750°C to 600°C. Accordingly, the relative density of AlN compact increased, as the milling time increased. It is clearly demonstrated that a quick densification of AlN bulk materials to near the theoretical density could be obtained by the combination of HFIHS and the preparatory high-energy ball milling process.