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고강도 저변형경화 재료의 소성가공을 위한 Bauschinger 효과의 정량적 분석
안순태(S. T. Ahn),조재민(J. M. Jo),박지태(J. T. Park),윤덕재(D. J. Yoon),손요헌(Y. H. Son),전만수(M . S. Joun) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
In this paper, experimental study on Bauschinger effect of high strength and low strain-hardening materials is carried out. A pre-heat treated special steel ESW105 is employed for this study. For the sake of comparison, the Bauschinger effect of a special steel SCM435 having normal strain-hardening capability is also investigated. It has shown that the Bauschinger effect of ESW105 tends to decrease more or less the forming load in cylinder compression of the workpiece initially lengthened through drawing process with proper reduction of area and that it does not contribute to forming load reduction for SCM435 under the same situations.
엄재근(J. G. Eom),이추실(Q. S. Li),장성민(S. M. Jang),안순태(S. T. Ahn),손요헌(Y. H. Son),현성운(S. W. Hyun),김혁(H. Kim),윤덕재(D. J. Yoon),전만수(M. S. Joun) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In this paper, plastic deformation behaviors of ESW105 and SCM435 steels are revealed by simulations and experiments. ESW105 is the special pre-heat-treated steel characterized by high initial yield strength and negligible strain-hardening behavior. The flow stresses of the two steels for large stain are calculated from tensile tests. Axial and lateral compressions of cylindrical bars are tested and simulated and the deformed shapes are compared to characterize the plastic deformation behaviors of the two materials. A forward extrusion process of a cylindrical bar is also simulated to reveal the difference. It has been shown that there are pretty much difference in plastic flow between ESW105 and SCM435 which causes from the difference in strain-hardening capability, implying that the experience-oriented design rules for common commercial materials may lead to failure in process design when the new material of ESW105 is applied without consideration of its plastic deformation behavior.
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.