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Fe-C-Cr-Mo-V계 공구강의 미세조직과 건식 긁힘 마멸 거동 (마모재 : Al₂O₃)
백응률,최상호 영남대학교 재료기술연구소 2000 재료기술연구 Vol.1 No.1
High carbon- high chromium tool steels display a number of advantages in abr asive wear applications. They contain moderat e amounts of chromium that produces massive chromium- rich carbides in an austenitic matrix of sufficient hardenability to be transformed to martensit e with relatively simple heat treatment . In this study the role of vanadium- rich carbides with high hardness as well as chromium- rich carbides in improving abrasive wear resistance was investigat ed using a series of Fe- C- Cr -Mo- V system alloys with varying carbide volume fr action. The abr asive wear resistance of the alloys against Al₂O₃ harder than chromium- rich carbides but softer than vanadium- rich carbides was measured with a dry abrasive rubber wheel abr asion test. The abr asive wear resist ance was affected by a volume fraction and variety of carbide because of a differance of hardness between carbide and abrasive. As a result, The specimen with the most volume fraction of vanadium- rich carbide harder than Al2O3 had the mot excellent abrasive wear resistance.
M_(7)C₃형 크롬탄화물의 경도에 미치는 고용원소(V, Mo, Mn)의 영향
백응률,유국종,정재영,안상호 영남대학교 재료기술연구소 2000 재료기술연구 Vol.1 No.1
This study makes an investigation into the effect of dissolved alloy element (V,Mo,Mn) on hardness of the M_(7)C₃ type chromium carbide. Dis solved alloy element (V,Mo,Mn) content in M_(7)C₃ type chromium carbide was analyzed by EDS and micro- hardness of the M_(7)C₃ type chromium carbide was measured by micro- Vicker s hardness tester . Increasing to V, Mo content in specimen, result to increasing dissolved V, Mo content in M_(7)C₃ type chromium carbide. Also hardnes s of M_(7)C₃ type chromium carbide was increased. At this point , V added specimen was superior to Mo added specimen. According as Mn content in specimen increases , Mn cont ent in M_(7)C₃ type chromium carbide some increased but hardness in M_(7)C₃ type chromium carbide some decreased.
백응률,심종필,김판권 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1
The aim of the investigation was to study the effect of hot working on the tensile properties of the Stellite 6 alloy, normally used in the form of castings. To determine most suitable hot working temperature, firstly specimens were preheated so as to obtain maximum deformation without cracking, upsetting tests were preformed at temperatures ranging from 1150 to 1300℃ at intervals of 50℃. As the result, the deformation of 35% without cracking is possible at 1250℃. Both cast and hot worked specimens were investigated microstructure, composition of carbides, constituting phase and hardness of specimens by using SEM and tensile test was carried out in order to know tensile properties of specimens. As the result of observing Microstructure, hot workings breakdowns eutectic carbide network in the Stellite 6 alloy, and eutectic carbides are aligned in rolling direction. The result of the tensile test, hot worked specimen is much higher than the casting specimen in the tensile properties.
Fe-C-Cr-Mo-V합금의 건식 긁힘 마멸 거동(마모재 : SiO₂)
백응률,최상호 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1
High carbon-high chromium tool steels display a number of advantages in abrasive wear applications. They contain moderate amounts of chromium that produces massive chromium-rich carbides in an austenitic matrix of sufficient hardenability to be transformed to martensite with relatively simple heat treatment. In this study the role of vanadium-rich carbides with high hardness as well as chromium-rich carbides in improving abrasive wear resistance was investigated using a series of Fe-C-Cr-Mo-V system alloys with varying carbide volume fraction. The abrasive wear resistance of the alloys against SiO2 softer than vanadium-rich carbide and chromium-rich carbide was measured with a dry abrasive rubber wheel abrasion test. The abrasive wear resistance was affected by a volume fraction and variety of carbide because of a differance of hardness between carbide and abrasive. As a result, The specimen with the most volume fraction of the total of carbide volume fraction had the most excellent abrasive wear resistance.
Effect of Particle Size in Feedstock Properties in Micro Powder Injection Molding
Baek Eung-Ryul,Supriadi Sugeng,Choi Chul-Jin,Lee Byong-Taek,Lee Jae-Wook 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Small powder size is very useful in achieving detailed structures. STS 316 nanopowders with an average diameter of 100 nm and were utilized to produce feedstock. The mixing behavior of the feedstock indicated that the nanoparticle feedstock produced the highest mixing torque at various powder loading compared to the micropowder feedstock. The nanoparticles feedstocks showed that elastic properties are dominant in flow behavior and high viscosity. Conversely the micropowders feedstocks, viscous properties are dominant in flow behavior and less viscosity, nanopowders feedstock perform lower flow activation energy than feedstock with bigger particles.
백응률,심종필,이재근 嶺南大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.30 No.1
A common problem in Metal Injection Molding (MIM)is that the final component dimensions do not comply with those specified for the component. therfore, several factors influence the tolerance capabilities of the MIM process, including, metal powder characterization, feedstock constituents, feedstock mixing, mold design, injection molding, debinding and sintering. The purpose of this study is to investigate dimensional control of atypical and thin parts in MIM with those factors taken into account. An improved wax-based multi-component was developed for MIM of tungsten cemented carbide. A critical solid loading of 58vol% and ideal rheological properties were obtained by the feedstock based on the binder. the 2.5-dimensional PIM filling program(PIM/flow)was able to predict injection molding to produce injection molded atypical and thin parts. Injection molding parameters including mold parameters and injection parameters were optimized by analyzing injection defeats. Solvent debinding followed by subsequent thermal debinding could substantially increase the debinding rate. Finally, Good shape retention ane dimensional accuracy were able to controlled within 0.5%.
크롬탄화물형 크롬백철 오버레이 용착금속에서의 $(Cr,\;Fe)_7C_3$의 경도특성
백응률,Baek Eung-Ryul 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.2
The effect of chemical constituents of $(Cr,\;Fe)_7C_3$ carbide phase on its hardness in the chromium-carbide type Cr white iron hardfacing weld deposits has been investigated. In order to examine $(Cr,\;Fe)_7C_3$ carbide phase, a series of filler metals with varying chromium contents was used. The alloys were deposited once or twice on a mild steel plate using the self?shielding flux cored arc welding process. The hardness of $(Cr,\;Fe)_7C_3$ carbide phase was measured by the micro-Vickers hardness test. It was shown that hardness of $(Cr,\;Fe)_7C_3$ carbide phase increased with increasing Cr content in $(Cr,\;Fe)_7C_3$ carbide phase. This behavior of the hardness of $(Cr,\;Fe)_7C_3$ carbide phase was explained by the types of chemical bonds that hold atoms together in $(Cr,\;Fe)_7C_3$ carbide phase.
최상호,백응률 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.9
High chromium white cast irons are commonly used where abrasion resistance is needed. Several investigators have reported the low stress abrasion resistance of white cast irons containing a various amount of carbide using rubber wheel abrasion tester(RWAT) with SiO₂and Al₂O₃ abrasives. In this study the role of MC type carbides with high hardness as well as M_7C₃type carbides in improving abrasive wear resistance was investigated. The weight percent of V was fixed as 5wt.%. However, the volume fraction of MC type carbide was decreased with increasing the volume fraction of primary (Cr, Fe, V)_7C₃type carbides due to the increase of higher Cr and C alloying content in hyper high chromium white cast irons. As a result, the specimen with many primary M_7C₃ type carbides and the lowest volume fraction of MC type carbide had the best abrasion wear resistance against SiO₂abrasive, but it was not effective for abrasive wear resistance against Al₂O₃ abrasives.