Abstract:In this paper, an experimental study of the Bauschinger effect is carried out in high-strength, low-strain-hardening materials. Pre-heat-treated ESW105 steel, which has a high initial yield stress with negligible strain-hardening capability, is employed in this study. For the sake of comparison, the Bauschinger effect is also investigated in SCM435 steel, which Quantitative study of the Bauschinger effect 21 has typical strain-hardening capability. The Bauschinger effect tends to decrease the forming load during cylinder compression of an ESW105 workpiece initially elongated via a drawing process with proper reduction of area, but does not contribute to forming load reduction in the case of SCM435, even under the same conditions, since it is surpassed by the strain-hardening capability of the material.Keywords: Bauschinger effect; drawn specimen; compression test; high strength; low strain-hardening.Reference to this paper should be made as follows: Joun, M., Ahn, S., Jin, H., Son, Y. and Yoon, D. (2017) 'Quantitative study of the Bauschinger effect in high-strength low-strain-hardening materials for metal forming applications', Int. J. Materials and Product Technology, Vol. 54, Nos. 1/2/3, pp.20-31.
Biographical notes:ManSoo Joun is a Professor of Gyeongsang National University (GNU) in South Korea. He is in charge of Technology Innovation Center (TIC) of GNU, which is the only TIC specialised at metal forming and powder forging in South Korea. He is interested in developing intelligent metal forming simulation technologies based on finite element method. He graduated from Seoul National University for his Bachelor degree, from KAIST for his Master degree, and from POSTECH for his PhD degree. His PhD thesis topic was the optimal die shape design in extrusion or drawing. After his PhD course, he has developed and commercialised a metal forming simulator called AFDEX, which is competitive in terms of solution accuracy and user-friendliness.Soontae Ahn is the CEO of Samhwa steel which is a global company producing wires and bars for springs and automotive parts. He is also in charge of the R&D centre of the company. He graduated from Busan National University for his Bachelor degree, from the same university for his Master and PhD degrees. He has developed high tensile spring wires such as energy saver wire (ESW) which has excellent characteristics of impact absorption as well as cold formability.Hotae Jin is a Master's student in Gyeongsang National University of South Korea. He is studying metal forming engineering and the related simulation technology. He is very interested in applying the simulation technology to special incremental metal forming processes including ring rolling process, Mannesmann roll piercing process, roll forging process, etc.Yoheon Son works as Vice President and Director of a research centre at the Youngsin Metal Industrial Company which is one of the leading fastener makers for the automobile, electronic and construction industries. He majored in mechanical engineering at Danko...
