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남궁 정(J. Namkung),김용찬(Y. C. Kim),이동희(D. H. Lee),오상훈(S. H. Oho),김남수(N. S. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
The cleanness of a large steel ingot is an important factor in affect to the physical properties and quality grade of the worked products. The nonmetallic inclusions, oxide particles and retained hydrogen in solidified ingots are the main cause of decreasing the degree of cleanness of cast product. The retained contents of inclusions and hydrogen are varied in locations of the cast part, shapes and casting process conditions. In this study, a large solid steel ingot and hollow one were casted and analyzed for the degree of cleanness, oxygen and hydrogen content distribution in the cross sectioned each ingot. The hydrogen content is higher in the center region than in the side part of the ingot, but the content of oxide inclusion, oxygen content was reveres one. Also, the solid ingot was show the high content distribution with hydrogen, but the hollow ingot was show the one with oxygen in the ingot.
남궁정(J. Namkung),김용찬(Y. C. Kim),김문철(M. C. Kim),윤중묵(J. M. Yoon),채영욱(Y. W. Chae),이동희(D. H. Lee),오상훈(S. H. Oho),김남수(N. S. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Cast defect in large steel ingots are estimated in quality and compared each other conditions on simulation results by now. The cast defects, micro-crack, shrinkage, pin hole which are predictable in simulation with a reasonable accuracy. In this study, 15 ton steel ingot casting was simulated for solidification model and cast defect prediction. And the real cast was carried out in a foundry for the compeer to the simulation results, the cast defect prediction. Also, the quantity of predicted defect was tried to measuring with the defect mach counting for the various simulated cast conditions. the defect quantity work was used to find the optimized cast condition in DOE(design of experiment) procedure.