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논문 : 기계가공 ; 극저탄소열연강판의 Edge Scab 표면결함 발생원인 규명
유재화 ( Jae Hwa Ryu ),윤보현 ( Bo Hyun Yoon ),천명식 ( Myung Sik Chun ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.6
The cause of the edge scab defects in the hot-rolled ultra-low carbon steels was investigated through the examination of the shape and microstructure of the bar corner, the measurement of temperature distribution over the bar width and the physical modelling of the deformation behaviour at the bar corner by using a plasticine. It was found that the edge scab was originated from the abnormal micro-bulging at the bar corner, where ferrite was formed due to the local temperature drop. The amount of the defective strips was considerably decreased by reducing the number of descaling and by increasing the reheating temperature.
논문 : 기계적 성질 ; 자동차 Diaphragm 스프링용 고강도강의 피로거동
신장철 ( Jang Chul Shin ),이성학 ( Sung Hak Lee ),유재화 ( Jae Hwa Ryu ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.6
This study aims at evaluating fatigue properties of two high strength steels, i.e., a V-and Cr containing alloy steel and a 0.84%C steel, used for automotive diaphragm spring. Fatigue properties were investigated on microstructure and strength under the fixed hardness condition. The fatigue limits of the two steels were same when tensile strengths were nearly same (over 1400 MPa), and that they were linearly decreased in the alloy steel austenitized and tempered at higher temperatuies. These results were then interpreted based on microstructural parameters such as prior austenite grain size, amount of carbides and twinnings, and martensite lath width. The alloy steel having the higher tensile strength and the smalles amount of carbides showed better fatigue properties than the 0,84%C steel. Thus, the fatigue properties of the spring steels can be pre-estimated by tensile strength instead of hardness since tensile strength correlated well with the fatigue limit.