High-Strength Steel Hot Forming Mechanics Performance and Characteristic Experimental Study

Abstract:

In high-strength steel hot forming, under the heating and quenching interaction, the material is oxidized and de-carbonized in the surface layer, forming a gradual change microstructure composed of ferrite, ferrite and martensite mixture and full martensite layers from surface to interior. The experiment enunciation: Form the table to ferrite, ferrite and martensite hybrid organization, completely martensite gradual change microstructure,and make the strength and rigidity of material one by one in order lower from inside to surface, ductility one by one in order increment in 22MnB5 for hot forming;Changes depends on the hot forming process temperature and the control of reheating furnace gas content protection, when oxygen levels of 5% protective gas, can better prevent oxidation and decarburization;Boron segregation in the grain boundary, solid solution strengthening, is a major cause of strength increase in ;The gradual change microstructure in outer big elongation properties, make the structure of the peak force is relatively flat, to reduce the peak impact force of structure, keep the structure of high energy absorption capacity;With lower temperature, the material yield strength rise rapidly,when the temperature is 650 °C, the yield strength at 950 °C was more than 3 times as much.

• Periodical: Key Engineering Materials (Volume 693)
• Pages: 800-806
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.693.800
• Online since: May 2016
• Authors: You Dan Guo*
• Keywords: Characteristic, Gradual Change Microstructure, High-Strength Steel, Hot Forming, Mechanics Performance

References

[1] P. HU, N. MA. Development of hot forming technology for ultra-high strength steel and its mechanical problem. Advances in Mechanics. 41(2011)3310-3332.

[2] Y.D. GUO, C.D. WU, X.N. CHENG. The cooling process control based on phase changing process and springback during hot stamping forming. Journal of Plasticity Engineering. 18(2011)70-73.

[3] Y.D. GUO, C.D. WU, X.N. CHENG. Study on Hot Stamping Forming Technologies and Cooling Rate of 10CrNi3MoV Marine Steel, Ship Engineering. 33(2011)80-84.

[4] M. Eriksson, M. Oldenburg, Testing and evaluation of material data for analysis of forming and hardening of boron steel components, Modeling Simul. Mater. Sci. Eng, 10(2002)227-294.

DOI: 10.1088/0965-0393/10/3/303

[5] G. Bergman, M. Oldenburg, A finite element model for thermo mechanical analysis of sheet metal forming. Int. Journal for Numerical Methods in Engineering. 59(2004)1167- 1186.

DOI: 10.1002/nme.911

[6] M. Naderi, L. Durrenberger, A, Molinari. Constitutive relationships for 22MnB5 boron steel deformed isothermally at high temperatures, Mat. Sci. and Eng. A. 478(2008)130- 139.

DOI: 10.1016/j.msea.2007.05.094

[7] M. Merklein, J. Lechler, Determination of material and process characteristics for hot stamping processes of quench enable ultra high strength steels with respect to a FE-based process design. In: SAE World Congress: Innovations in Steel and Applications of Advanced High Strength Steels for Automotive Structures, Paper No. 2008-0853, (2008).

DOI: 10.4271/2008-01-0853

[8] N. MA, P, HU, K. K YAN, et al. Research on Boron Steel for Hot Forming and Its Application, Journal of Mechanical Engineering. 46(2010)69-72.

[9] Z.W. XING, J. BAO, Y.Y. YANG, et al. Hot stamping processing experiments of quenchable boron steel, Materials Science and Technology. 16(2008)172-175.

DOI: 10.4028/www.scientific.net/msf.575-578.299

[10] C. JIANG, Z.D. SHAN, B.L. ZHUANG, et al. Effect of initial deformation temperature on mechanical properties of ultra-high strength steel hot stamping parts, Heat Treatment of Metals. 36(2011)66-69.

[11] N. MA, Z.H. ZHANG, P. HU, et al. Microstructure and Mechanical Behavior of New Type Multi-layer Metallic Composite Material in Hot Forming, Journal of Materials Engineering. 5(2011)88-92.

[12] C. JIANG, Z.D. SHAN, B.L. ZHUANG, et al. Microstructure and properties of hot stamping 22MnB5 steel, Transactions of Materials and Heat Treatment. 33(2012)78-81.

[13] M.Z. XI, S.Y. GAO. Heat-Treated Microstructures and Mechanical Properties of TA15 Titanium Alloy Fabricated by Laser Rapid Forming, Chinese Journal of Lasers. 39(2012)30-35.

DOI: 10.3788/cjl201239.0103007

[14] Y.T. CHENG, C.M. CHENG. Scaling approach to conical indentation in elastic plastic solids with work hardening, J Appl Phys. 84(1998)1284-1289.

DOI: 10.1063/1.368196

[15] M. DAO, CHOLLACOOPN, VANVLIETKJ, Computational modeling of the forward and reverse1 problems in instrumented sharp indentation, Acta Mater. 49(2001)3899-3918.

DOI: 10.1016/s1359-6454(01)00295-6

[16] J. Adameczky W. ozgowicz, R. Wusatowski, E. Kalinowska-Ozgowiez and R. Grzyb, Boron-treated micro alloyed quenched and tempered plates, their structure and properties, Journal of Materials Processing Technology, 1997 , 64.

DOI: 10.1016/s0924-0136(96)02548-4

[17] Y.X. ZHAO, X.P. BI, X.X. LIU, et al. Research on Computer Simulation for Heat Transfer in Vehicle Engine Using Lumped Parameter Method, Transactions of Csice. 21(2003)239-243.