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Fe-Pb-Cu 계 소결재의 기계적 성질에 미치는 Sn 의 영향
임태홍,나형용,이흥열 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.12
The original and most widely used P/M self-lubricating bearing material is bronze but iron-based bearings have the merits that they have the higher strength and cheaper than copper-based bearings so that its use has risen recently. So in this study, microstructure and mechanical properties of the Fe-Pb-Cu and Fe-Pb-Cu-Sn bearings sintered at 840∼960℃ and driving performance test of bearings after sizing sintered bearings are investigated. In case of Sn addition with 0.5∼2wt% to Fe-8Pb-2Cu, pore distribution was uniform and Pb segregation was reduced. And the coefficient of friction and temperature-rise were small. Pb is distributed uniformly at interparticle and grain boundarys because the wettability of Pb increased and Sn in iron increased diffusion rate during sintering.
P 첨가 냉간압연 고강도강의 성형성 및 집합조직에 미치는 열간압연 코일링 온도의 영향
한봉희,임태홍,박영구 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.8
Cold-rolled sheet steel for automobiles requires high strength and good drawability, for that purpose P-bearing low carbon, low maganese Al-killed steel is investigated. For various coiling temperatures on hot rolling stage, the effects of coiling temperatures on textures and deer-drawability of P-bearning steel were investigated by 1) pole intensity analysis 2) Transmission Electron Microscopy 3) plastic strain ratio determination from tensile test. No apparent changes in textures of hot-rolled sheet and cold-rolled sheet were detected within the range of coiling temperatures examined. The optimum coiling temperature for good recrystalization texture, high average strain ratio (R) and low planar anisotropy (ΔR) after recrystallization annealing was 600℃. However, differences in their characteristics were very slight except the specimen of coiling temperature 700℃ However, since the maximum tensile strength of the specimen was obtained when coiled at 600℃, optimum coiling temperature which could provide good deep-drawability while sustaining high strength might be concluded to be around 600℃ in this steel.
기계적합금화시 질소 및 아르곤 분위기에 따른 Fe-Zr 계 합금분말의 상변화와 자기특성
김원태,임태홍,나형용,이성의 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.3
The effect of surrounding atmosphere on phase changes during mechanical alloying of Fe-Zr was studied by X-ray diffractometry, transmission electron microscopy and magnetometry. Atmosphere during mechanical alloying was controlled by using either nitrogen or argon gas. Mechanically alloyed Fe-Zr powders showed a mixture of amorphous phase and α-Fe phase. Amorphization during mechanical alloying in nitrogen atmosphere was retarded compared with mechanical alloying in argon atmosphere. Fraction of α-Fe phase was higher in the alloy powders processed in nitrogen atmosphere than in alloy powders in Ar. The retardation of amorphization during mechanical alloying in nitrogen may be attributed to hardening of Fe phase by the increase of N solubility, which results in difficulty of plastic deformation of Fe phase. Variation of magnetization with processing time agrees well with the structural change with processing time. With increasing processing time, magnetization of Fe-Zr alloys processed in argon decreased rapidly due to the formation of amorphous phase, reached a steady values. Variation of magnetization of Fe-Zr powders processed in nitrogen atmosphere was not significant due to the retarded amorphization. Alloy powders processed in nitrogen atmosphere showed higher magnetization than the powders in Ar atmosphere.