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RISS 인기검색어
- 검색키워드
- 주제어 : Degree of undercooling (검색결과 2 건)
- 무료
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동적 페라이트 변태에 미치는 오스테나이트 과냉도의 영향
洪承讚,林成煥,李景鍾,李經燮 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.1
Hot compression test was performed to examine the effect of degree of undercooling on dynamic ferrite transformation behavior. Austenite undercooling was controlled by cooling rate from austenitization temperature to deformation temperature. The degree of undercooling was determined as ΔT (=Ae_3 - Ar_3). Ae_3 temperature was calculated by using Thermo-Calc and Ar_3 temperature was measured by dilatometry. The fine grained ferrite was formed during 70% deformation just above Ar_3 temperature. It was observed that the average ferrite grain size was 2 ㎛ regardless of temperature. At this temperature the flow stress was decreased by ferrite formation during deformation. The amount of ferrite transformed dynamically was increased as ΔT was increased. While, the ferrite grain size was mainly influenced by the amount of deformation. It was also confirmed that the critical strain of dynamic ferrite at high cooling rate to deformation temperature was shifted to lower strain compared to that at low cooling rate with the aid of increasing undercooling.
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증발온도 변화에 따른 냉동 사이클에 대한 비교 분석에 관한 연구
윤철순(Chul-soon Youn),이원휘(Won-hui Lee) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.3
Is made to lower the temperature of the evaporator from the loading condition as a matter of which is identical and when and the degree of superheat increases and the degree of undercooling decreases and is caused by with degree of undercooling according to temperature difference of the misfortune gas changes will be able to increase a degree of superheat and with the misfortune gas heat exchanger. The supercooling to moral decrement brings about a case to moral increase and decreases a refrigeration effect and the record coefficient decreases resultantly. Namely, when the degree of undercooling increases, is joined together with decrement of the flash gas and the case degree decreases and the refrigeration effect increases. The evaporator about under looking downward control operation at the time of compressive elegy remarkably increases under identical conditions and sub-zero 10 degree seed one time affects with strong point of most decrease and the record coefficient makes decrease.
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