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유선준,Pleschiutschnigg, F P,Gammal, T El 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.11
Among the processes of thin slab casting, cast-rolling technique has been developed, which permits the reduction of slab thickness during solidification. To simulate this process, a water-cooled mold with a inclined side-wall is designed. This side-wall can be made vertical by means of a hydraulic press during solidification. This procedure makes it possible to bring the effect of cast-pressing to cast slab during solidification. With cast-pressing, the center crack and macrosegregation due to bulging are eliminated at half-height of cast slab. Cast-pressing leads to a considerable area of equiaxed structure in the top half of the cast slab. The ferrite grain size, after γ→α phase transformation, is reduced by cast-pressing. However, after hot rolling with two passes, the effect of cast-pressing on the tensile properties and ferrite grain size does not exist any more, probably because of longer soaking time and recrystallization during hot rolling.
박물 스래브 주조시 주편두께가 조직 및 기계적 성질에 미치는 영향
유선준,Pleschiutschnigg, F P,Gammal, T El 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.5
With a specially designed water-cooled mold, casting thickness could be varied between 40 and 80㎜. With the decrease of casting thickness the secondary dendrite arm spacing was reduced and the ferrite grain size, after γ->α phase transformation, was reduced. In addition, the casting thickness has no influence on mechanical properties and ferrite grain size after hot rolling with the different total reduction in the range of 0.7∼1.4 in the process of roughing mill. So it is possible, in contrast to conventional casting and rolling, the strand thickness could be reduced during the casting stage instead of hot rolling process without the inferiority in mechanical properties.
유선준,박기철 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.3
For the production of severely cold-headed ware, such as a phillips screw, the material requires good cold headability, In this paper the optimum austenite grain size range for good cold headability of stable austenitec stainless steel is discussed. After simulating the cold heading process of phillips screw with the aid of ABAQUS 5.2, the effect of austenite grain size on cold headability is investigated by compression test with drop-weight-tear tester. This result has a good agreement with that of tensile test. The optimm austenite grain size for cold heading is considered to be form 45㎛ tp 60㎛ because of the formation of deformation twins and the prevention of orange peel effect at the surface.