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고크롬 백주철재 소실모형 주조시 표면 결함 발생에 미치는 모형밀도 및 감압의 영향
이규희 ( Kue Hee Lee ),유국종 ( Kook Jong Yoo ),백응률 ( Eung Ryul Baek ),최현진 ( Hyun Jin Choi ),이경환 ( Kyung Whoan Lee ) 한국주조공학회 2002 한국주조공학회지 Vol.22 No.6
N/A The effect of mold density and evacuation on surface defect of high chromium cast iron upon EPC process was investigated. Under evacuation of 0.1~0.3 atm, surface defects were carbon defect, burn on and misrun. Carbon defect was augmented by increasing mold density from 0.011 g/㎤ to 0.03 g/㎤ under evacuation of 0.1~0.3 atm, but carbon defect was decreased by increasing evacuation from 0.1 to 0.3 atm. Burn-on wasn`t found under evacuation of 0.1 atm regardless of mold density, but burn-on was augmented by increasing evacuation from 0.2 to 0.3 atm and decreased by reducing mold density. Misrun was only found under 0.1 atm evacuation and 0.011 g/㎤ mold density.
윤양진,유국종,서국웅,정미라,강영택,이훈식,서국은 釜山大學校 附設 體育科學硏究所 1999 體育科學硏究所 論文集 Vol.15 No.-
The purpose of this paper is to select 7 male athletes and female athletes of high school, and to compare their active potential differences of upper arm muscles according to characteristic of a racket. the results obtained are as follows: 1. According to the accumulative distribution rate of racket material, graphite and wood material show better efficiency in case of brachio radialis muscle of male athletes, but the racket material shows no constant efficiency in brachii radialis muscle of female athletes. In case of flexor carpi radialis muscle, wood material provides better efficiency only for male athletes. In case of triceps brachii muscle, wood material gives better efficiency to males athletes and steel material gives better efficiency to females athletes. Especially in case of biceps brachii muscle, neither male nor female athletes are influenced by racket materials at impact. 2. In the muscle load rate according to racket material, wood has the highest muscle active potential and graphite has the lowest active potential. Therefore, graphite is thoght to be better in the efficiency of muscle load rate.
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.