Experimental and theoretical study on the hot forming limit of 22MnB5 steel

To reveal the effects of forming temperature and blank thickness on the formability of boron steel 22MnB5, which is represented by forming limit diagram, the hot forming limit experiments and B-pillar hot stamping simulations are conducted. Combined with air cooling test, the forming limit diagrams of boron steels with different blank thicknesses of 1.8, 1.6, and 1.4 mm and forming temperatures of 800, 700, and 600 °C are established. The relationships between the formability and the crystal structure of steel, the forming limit diagram, and the effect of blank thickness and forming temperature on the formability of boron steel are extensively investigated. A model for prediction of hot forming limit of 22MnB5 steel before the occurrence of phase transformation induced by cooling based on Oh's ductile fracture criterion and Logan–Hosford yield criterion is derived and verified by experiments. The research thus provides an in-depth understanding of the formability of 22MnB5 steel for its process determination and process parameter configuration in industries.

[1]  Fahrettin Ozturk,et al.  ANALYSIS OF FORMING LIMITS USING DUCTILE FRACTURE CRITERIA , 2004 .

[2]  Manfred Geiger,et al.  急冷可能な超高強度鋼22MnB5の流れ特性の特徴づけ | 文献情報 | J-GLOBAL 科学技術総合リンクセンター , 2006 .

[3]  R. H. Wagoner,et al.  Formability of stainless steel , 1998 .

[4]  William F. Hosford,et al.  Calculations of forming limit diagrams , 1990 .

[5]  Elisabeth Massoni,et al.  Formability investigations for the hot stamping process , 2006 .

[6]  Joël Wilsius,et al.  Status and Innovation Trends in Hot Stamping of USIBOR 1500 P , 2008 .

[7]  J. Min,et al.  Investigation on the Effects of Sheet Thickness and Deformation Temperature on the Forming Limits of Boron Steel 22MnB5 , 2011 .

[8]  R. Mahmudi,et al.  Calculation of forming limit diagrams using Hill's 1993 yield criterion , 2011 .

[9]  A. Akbarzadeh,et al.  Experimental and analytical studies on the prediction of forming limit diagrams , 2009 .

[10]  Frédéric Barlat,et al.  Plastic behavior and stretchability of sheet metals. Part I: A yield function for orthotropic sheets under plane stress conditions , 1989 .

[11]  Frédéric Barlat,et al.  A Yield Function for Orthotropic Sheets under Plane Stress Conditions , 1989 .

[12]  William F. Hosford,et al.  Upper-bound anisotropic yield locus calculations assuming 〈111〉-pencil glide , 1980 .

[13]  Manfred Geiger,et al.  Characterisation of the Flow Properties of the Quenchenable Ultra High Strength Steel 22MnB5 , 2006 .

[14]  C. C. Chen,et al.  Ductile Fracture in Axisymmetric Extrusion and Drawing—Part 2: Workability in Extrusion and Drawing , 1979 .

[15]  G. Cosovici,et al.  FLD theoretical model using a new anisotropic yield criterion , 2004 .

[16]  R. Hill.  Theoretical plasticity of textured aggregates , 1979, Mathematical Proceedings of the Cambridge Philosophical Society.

[17]  Jun Zhang,et al.  Optimization of contact forces in tailor-welded blanks forming process , 2007 .

[18]  K. Inal,et al.  Forming limit comparisons for FCC and BCC sheets , 2005 .

[19]  Chi Feng Lin,et al.  Plastic deformation and fracture behaviour of Ti–6Al–4V alloy loaded with high strain rate under various temperatures , 1998 .

[20]  Jianping Lin,et al.  Investigation on hot forming limits of high strength steel 22MnB5 , 2010 .

[21]  R. Hill,et al.  A user-friendly theory of orthotropic plasticity in sheet metals , 1993 .

[22]  Zhixiang Zhao,et al.  One-step FEM-based evaluation of weld line movement and development of blank in sheet metal stamping with tailor-welded blanks , 2007 .

[23]  A. Korhonen,et al.  Forming and fracture limits of austenitic stainless steel sheets , 2008 .

[24]  Stefania Bruschi,et al.  Mechanical Properties and Plastic Anisotropy of the Quenchenable High Strength Steel 22MnB5 at Elevated Temperatures , 2007 .

[25]  A. Barcellona,et al.  Effect of Plastic Hot Deformation on the Hardness and Continuous Cooling Transformations of 22MnB5 Microalloyed Boron Steel , 2009 .

[26]  Plastic Deformation Characteristics Of AZ31 Magnesium Alloy Sheets At Elevated Temperature , 2007 .

[27]  J. Signorelli,et al.  Study of limit strains for FCC and BCC sheet metal using polycrystal plasticity , 2011 .

[28]  Haydar Livatyali,et al.  Effects of sheet thickness and anisotropy on forming limit curves of AA2024-T4 , 2013 .

[29]  J. Min,et al.  Effect of necking types of sheet metal on the left-hand side of forming limit diagram , 2010 .

[30]  Evânio L. S. Vieira,et al.  Proposing a better forming limit diagram prediction: a comparative study , 2003 .