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유가영(G Y. Yoo),강남현(N. H. Kang),정은정(J. E. Jung),홍재근(J. K. Hong),김정한(J. H. Kim),이종수,이진모(J. M. Lee),김남용(N. Y. Kim),염종택(J. T. Yeom) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
The ingot-breakdown process design of tower flange material (low-alloy steel) for offshore wind turbine was investigated with finite element (FE) simulation and experimental analysis. Based on the compression test results of the low-alloy steel, deformation processing map was generated using the superposition approach between the dynamic materials model (DMM) and Ziegler’s instability criteria. FE analysis was simulated to predict the deformed shape and the formation of forming defects during ingot breakdown process of tower flange. Finally, an optimum process design for producing a uniform low-alloy steel billet without forming defects was suggested.
100Kfg/㎟급 선조질강의 합금원소에 따른 유도가열효과에 관한 연구
박지태(J. T. Park),안순태(S. T. Ahn),권대호(D. H. Kwon),서주현(J. H. Seo),강남현(N. H. Kang),윤덕재(D. J. Yoon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
This study is for investigating the effect of induction heating with various alloy elements to manufacture the pre-heat treated steels of 100Kfg/㎟ for cold heading. For four kinds of steels, the condition of induction heating (especially, induction tempering) were observed, and their microstructure and tensile and compressive properties were investigated. The middle carbon steel and the low carbon Cr-Mo steel are needed the higher Grange-Baughman tempering parameter than that of the low carbon Cr steel to obtain 100Kfg/㎟ tensile strength. For accomplishing the pre-heat treated steel of 100Kfg/㎟ tensile strength having advanced cold heading, It is needed that the pre-heat treated steel is manufactured by induction quenching and tempering with the low carbon alloy steel to have the high ratio of ferrite and the fine globular cementite simultaneously.