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응융염 침적법에 의한 VC Coating 금형강의 인성에 관한 연구
이병권,남태운 ( B . K . Lee,T . W . Nam ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.2
Bending fracture strength test and impact strength test were made for VC coated die steels treated by immersing in molten borax bath and for hardened steels which were quenched and tempered, in order to clarify the effect of VC coating at 1000℃. The material used in this investigation was representative cold and hot work die steels STD11, STD61. The results obtained are as follows. 1) The bending fracture strength of VC coated die steel(STD11, STD61) was lessened with increasing the thickness of the VC coated layer. 2) With increasing the immersing time (imcreasing the thickness of the VC coated layer) the maximum hardness was obtained at 480 minutes holding, after that holding time hardness was decreased. 3) The impact strength of the VC coated die steel was not decreased. In the casse of STD11, it was higher than that of the quenched condition especially at low tempering temperature, and vice versa at high tempering temperature. However in the case of STD61 shows the result to the contrary.
용융염 침적법에 의한 VC coating 금형강의 굽힘 피로강도에 관한 연구
이병권,남태운 ( B . K . Lee,T . W . Nam ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.3
Bending fatigue strength tests were made for VC coated die steels which were coated by immersing in a molten borax bath and for hardened die steels which were quenched and tempered, in order to clarify the effect of VC coating at 1000℃ and 1025℃. The material used in this investigation was a representative cold and hot die steels STD11, STD61. The results obtained are as follows. 1) The endurance limit of VC coated die steels was a little lower than that of hardened die steels. It is considered to be mainly due to the decrease of hardness in the substrates. Accordingly, the endurance limit recovered almost to the level of hardened die steels by an additional diffusion treatment. 2) The initiation point of fatigue fracture of VC coated die steels in reversed bening was on the substrate just under the VC layer. Hence, the endurance limit is corrected to the hardness of this part. 3) But, there is a considerable scatter in this relationship and the endurance limit of VC coated die steels was a titi,le lower than that of hardened die steels with equal hardness. These results suggest that the fatigue strength of VC coated die steels is determined not only by the hardness but also by other factors. For example, the residual stress in the substrate just under VC coating layer is one of the factors besides hardness which is mainly related to the retained austenite(γ_R)
김창년,박영무,이병권,안병성,Kim, C.N.,Park, Y.M.,Lee, B.K.,An, B.S. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.4
Vapor-liquid equilibrium apparatus is designed and set up. The vapor-liquid equilibrium data of the binary system HFC32/134a are measured in the range between 258.15 and 283.15K at compositions of 0.2, 0.4, 0.6 and 0.8 mole fraction of HFC32. Twenty-two equilibrium data are obtained. Based upon the present data, the binary interaction parameter for Carnahan-Starling-De Santis equation of state is calculated. Temperature range of data is extended to 313.04K using the data in the open literatures. Interaction parameters are determined at nine isotherms.
이효수,남태운,이병권 ( H . S . Lee,T . W . Nam,B . K . Lee ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.2
It has been investigated that the ion nitriding effects of a STD61 steel in various time conditions of 3 to 9 hours, and the microstructure of compound and diffusion layers of the ion nitrided specimen for 6 hours and subsequently reheated for 1 hour at various temperatures of 400∼800℃. As the nitriding time increased, the thickness of compound and diffusion layers was increased, but the hardness of surface was not considerably increased (Max Hv=1045 at 9hrs). Some of the nitrogen was denitrided out of the surfac and diffused into the core, and also the oxides (Fe₃O₄, Fe₂O₃) were formed on the surface of the specimen during repeating. The compound layer was partially decomposed at about 600℃ but the diffusion layer was increased up to 800℃. With increasing repeated temperture, the hardness of the surface was decreased, whereas the hardness depth of diffusion layer (0.25㎜) was increased up to 600℃ more than that of ion nitrided (0.18㎜). The blend-heat treated STD61 steel by ion nitriding is therefore expected to hold on the characteristics of ion nitriding up to 600℃.
AISI E 52100 강의 기계적 성질에 미치는 탄화물 크기의 영향
최기윤,김봉완,남태운,이병권 ( K . R . Cho,B . W . Kim,T . W . Nam,B . K . Lee ) 한국열처리공학회 1990 熱處理工學會誌 Vol.3 No.4
A study has been investigated on the effect of mechanical properties (tension strength, rotary bending fatigue strength, wear resistance, hardness) according to the carbide particle size variation by the treatment of 1) quenching tempering, and 2) quenching, subzero treatement and tempering. The material used in this investigation was a typical bearing steel, high C high Cr, AISI E 52100. The result obtained in this study were as follows : (1) Finer the carbide particle size increasing the hardness and retained austenite in same quenching condition. (2) Finer the carbide particle size reduced the tension and rotary bending fatigue which were resulted from austenite grain growth and carbide precipitation on grain boundry that induced by carbide refine heat treatment. (3) Finer the carbide particel size increasing the wear resistance which were resulted by uniform distribution of carbide and increased hardness induced by microstructural uniform hardenability of matrix. (4) When the carbide particles were refinded, subzero treatment is effective only wear resistance and hardness.