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탄소강/Cr-주철 Bimetal 접합부의 강도에 관한 연구
천병선,이철로,임승택 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.6
A carbon steel/Cr-cast iron bimetal produced by an alloy cored wire welding method showed a zigzag type fracture in the interface in tension tests. Results obtained from the interface were; σ_(UTS) = 29.75 (㎏/㎟) σ_(ys) =20.08 (㎏/㎟) E = 8.5 × 10^7(psi). The evaluated value of J_(IC) was 0.7 ㎏.f/㎜. Brittle fracture were observed only in the cant structure. Wear resistance of hardfaced metal was superior to that of base metal. The wear mechanism was mostly abrasive wear. but oxidation wear and adhesive wear were also activated partly.
千炳善 충남대학교 공업기술개발연구소 1976 工業技術開發硏究所論文集 Vol.3 No.1
High Manganese steel with Mn, Cr, Co and Ti were studied mainly by micorography on the isothermal carbide precipitation after solution treatment. High Manganese austenite stainless steel has been developed for the high temperature application especially in boiler tubes. It was found that the hardness of the steels increased with increasing of the Titanium content and the solution temperatures. This hardness is due to dispersion hardening caused by undissolved Titanium-carbide particles. The major hardening phase was TiC and M_23C_6.
Al-Li-Cu-Zr 합금의 기계적 성질에 미치는 저온 시효 열처리의 영향
천병선,김종희,이용연 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.2
The effects of low temperature aging on the impact toughness and mechanical properties of Al-1.9%Li-3.0%Cu-0.15%Zr alloy have been investigated. It shows that the impact absorption energy and elongation are increased in the order of over-aged, peak-aged and under-aged specimen at the various aging temperature, and these values in the specimen peak-aged at lower aging temperature are increased. In the specimens aged at 120℃ and 140℃, dimples are observed in the matrix and around the grain boundary. Intergranular fracture has been observed noticeably in the 160℃ peak aged specimen. These results are attributed to the microstructural changes by the low temperature aging treatment that forms more dense and homogeneous distribution of T₁ phases on the dislocations within the matrix and more narrow precipitate free zone in the grain boundary at 120℃ and 140℃ than at 160℃.
Ti-Ni-X (X = Cu, Al) 형상기억합금의 의탄성 및 내식성에 관한 연구
천병선,한철호,이형란,홍석균 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.6
Pseudoelasticity behaviour and passivetion treatment on the shape memory alloys are known to have a great deal of influence on the stability of transformation temperature, shape recovery and improvement of corrosion resistance characteristics in their practical applications. The present work was aimed to examine the pseudoelasticity characteristics by tensile test, and corrosion resistance characteristics by corrosion test in Ti-Ni-X(X-Al, Cu) alloys with/ without passivation treatment. The results of this study are as follows, 1. The results of tensile test for Ti-Ni-X(X-Al, Cu) alloys show that the shape recovery is nearly perfect in martensite state and critical stress for slip is increased with increasing strain. Also, the pseudoelasticity behaviour appears in Ti_(50.0)Ni_(40.0)Cu_(10.0) alloy by unloading at temperature above Af and Ti_(50.0)Ni_(49.0)Al_(10.0) alloy by cold working over 25%. 2. The results of the anodic polarization corrosion test show that the corrosion resistance characteristics of Ti-Ni based alloys can be increased by application of passivation treatment and Ti-Ni-X(X=Al, Cu) alloys has better corrosion resistance characteristics than Ti-Ni equiatomic composition alloy.
고분해능 전자현미경에 의한 SiAiON-SiC 복합재료의 미세구조와 파괴 특성
천병선,최경식,이병택,평가찬이 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.12
Microstructure and fracture behavior of pressurelessly-sintered SiAlON-SiC composite containing different SiC contents was investigated using high-resolution electron microscopy(HREM) and micro-indentation fracture(MIF) technique. The SiAlON-6%SiC composite showed the highest Vickers hardness and fracture toughness. The composite contained nanometer-size SiC particles dispersed homogeneously both in SiAlON grains and at grain boundaries. The grain boundary were formed with a 1-2㎚ thick amorphous layer regardness of the SiC content. The interface between SiAlON and SiC embedded in the grain, however, were formed without any amorphous layer. The typical fracture mode of the monolithic SiAlON was intergranular. That is, cracks propagate along The SiAlON grain boundaries with amorphous layers. In SiAlON-6wt%SiC, mixed mode of intergranular and transgranular fracture was observed, which seems to be caused by the nanometer-size SiC distributed in the SiAlON grains. In SiAlON-12wt%SiC, cracks propagated more straight through the SiAlON grains with submicron-size SiC particles, and the typical fracture mode was transgranular.
정응력하에서 Ti50NI35Pd15 형상기억합금의 변형거동에 관한 연구
천병선,이갑호,오현숙,홍석균 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.9
The B₂⇔ B_(19) transformation behaviours in a ternary Ti_(50)Ni_(35)Pd_(15)(at.%) alloy were investigated by means of electrical resistivity measurements, differential scanning calorimetry and constant load thermal cycling tests and they were compared with the B₂⇔ R and B₂⇔ B_(19) transformations in a thermo-mechanically treated binary Ti-50.2Ni alloy. The transformation start temperature of B₂→ B_(19) transformation and transformation finish temperature of B_(19) → B₂ transformation increased lineary with increasing applied stress. The stress dependence of the transformation start temperature, transformation elongation and hysteresis of the B₂⇔ B_(19) tranformations in the ternary alloy were 10.0MPa/K in the reciprocal form(dσ/dT) where σ in the critical stress for inducing the transformation, 2.1% and 25K, respectively. The B₂→ B_(19) transformation in the ternary Ti-Ni-Pd alloy lies between the B₂→ R and B₂B_(19)' transformation in the binary Ti-Ni alloy. And the transformation elongation associated with the B₂⇔ B_(19) transformation increased rapidly for stresses less than 80MPa and slowly above 80MPa with increasing applied stress.
Al/Graphite 합금 복합재료의 마모특성에 미치는 흑연의 영향
천병선,홍순직,김홍물 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.7
In the present investigation, P/M method and extrusion process have been used to manufacture Al6061/graphite composite materials. The graphite particles were distributed uniformly within the Al6061 alloy matrix. The results showed that tensile properties and hardness of the composites reduced with increasing graphite volume and a comparison of experimental and calculated results was compatible to the tensile strength behavior. The wear behaviour of the 6061/graphite composites was also studied as a function of speed and distance with reference to different values of the matrix hardness. The obtained wear data were interpreted on the basis of the analysis of the surface and subsurface damage to the composites. As the hardness of the materials increased, their specific wear rate also decrease.
千炳善 충남대학교 공업기술개발연구소 1975 工業技術開發硏究所論文集 Vol.2 No.2
One of the most serious problems in heat resistant alloy steel would be the control of accelerated corrosion caused by using it at high temperature. In this paper were studied chromium diffusion coating (chromizing) by powder method for austenitic heat resistant alloy used for boiler or gas turbine. When Nickel free austenitic heat resistant steel containing cobalt 2% was chromized by a mixture of chromium powder, alumina-powder and ammonium chloride. The thickness of the layer was limited to a small value mainly because of low diffusion constant of chromium in this alloy. The maximum depth of the layer on alloy steel obtained by powder method was 50 microns and surface chromium concentration was 69 wt. % and Activation energy at 1,200℃ was 37.4 Kcal/mole.