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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%.
고크롬 철계 오버레이용접층의 긁힘마모거동에 미치는 기지상의 영향
백응률 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.1
The effect of matrix phase (austenite, pearlite, martensite) on the low stress abrasion resistance in the chromium-carbide-type high Cr white iorn hardfacing weld deposites has been investigated. In order to examine matrix phase, a series of alloys with different matrix phase by changing the ratio of Cr/C system by heat treatment were employed. The alloys were deposited twice on a mild steel plate using self-shielding flux cored arc welding process. The low stress abrasion resistance of the alloys against sands was measured by the Dry Sand/Rubber Wheel Abrasion Test(RWAT). Even though formation of pearlite phase in the matrix showed higher hardness than that of austenite, there was no observable difference in wear resistance between the pearlite and austenite phase for the same amount of chromium-carbide in the matrix. On the other hand, the formation of martensitic phase,, from heat treated austenitic alloys (high content of Cr), enhanced wear resistance due to its fine secondary precipitates.
고크롬 철계 오버레이용접층의 긁힘마모거동에 미치는 크롬탄화물 양의 영향
백응률 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.1
The effect of volume fraction of Cr carbide phase (Cr CVF) on the low stress abrasion resistance in the chromium-carbide-type high Cr white iron hardfacing weld deposits has been investigated. In order to examine Cr CVF, a series of alloys with varying Cr CVF by changing chromium and carbon contents and the ratio of Cr/C were employed. The alloys were deposited once or twice on a mild steel plate using the self-shielding flux cored arc welding process. The low stress abrasion resistance of the alloys against sands was measured by the Dry Sand/Rubber Wheel Abrasion Test (RWAT). It was shown that hardness and abrasion resistance increased with increasing Cr CVF within the whole test range (Cr CVF : 0.23-0.64). Both primary Cr carbide and eutectic Cr carbide were particularly effective in resisting wear due to their high hardness.
백응률,정재영,안상호 대한용접접합학회 1997 대한용접·접합학회지 Vol.15 No.5
본문에서는 국내의 오버레이 용접기술의 적용현황 및 대표적인 적용사례, 오버레이 용접기술 및 용접재료의 개발현황 등을 중심으로 살펴봄으로써 아직 국내에서는 널리 알려지지 않은 본 기술에 대한 이해를 넓히고자 했다.
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.