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논문 상세정보

Abstract

For the purpose of improving crashworthiness qualities and maximizing weight saving efficiency, TWB's(tailor welded blanks) of quench-hardenable boron steel sheet formed by hot stamping processes has been used for automotive BIW (body in white) applications. In this work, the flow behaviors of TWB of quench-hardenable boron steel sheet were investigated in uniaxial tension tests at elevated temperature. TWB's having a uniform thickness of 1.4mm were fabricated by laser welding. Specimens with two weld line directions were used to test the mechanical property and reliability of the weld zone. After heating at $950^{\circ}C$ for 5min, the specimens were subjected to tension test at 650, 700 and $800^{\circ}C$ with a strain rate of 0.01 /s and at $700^{\circ}C$ with strain rates of 0.01, 0.1 and 1/s. The ultimate strength of the weld zones was higher than that of the base materials at 650 and $700^{\circ}C$, but was similar to the base metal at $800^{\circ}C$. Fracture occurred at the base material at 650 and $700^{\circ}C$, but at the weld zone at $800^{\circ}C$.

참고문헌 (10)

  1. H. Karbasian, A. E. Tekkaya, 2010, A Review on Hot Stamping, J. Mater. Process. Technol., Vol. 210, pp. 2103-2118. 
  2. H. Choi, K. Nam, W. Lim, D. C. Ko, B. M. Kim, 2010, The Optimizaton of Hot Press Bending for Imporving Dimensional Accuracy and Mechanical Strength of Bent Product, Met. Mater. Int., Vol. 16, No. 6, pp. 1001-1007. 
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  4. Information on http://www.automotive -circle.com. 
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  8. H. H. Bok, M. G. Lee, H. D. Kim, M. B. Moon, 2010, Thermo-Mechanical Finite Element Analysis Incorporation the Temperature Dependent Stress-Strain Response of Low Alloy Steel for Practical Application to the Hot Stamped Part, Met. Mater. Int. Vol. 16, No. 2, pp. 185-195. 
  9. D. Kim, W. Lee, J. Kim, C. Kim, K, Chung, 2009, Experimental Formability Investigation for FSW Sheets with Respect to Base Material's Directional Combination, Trans. Mater. Process., Vol. 18, No. 1, pp. 73-79. 
  10. W. Lee, K. H. Chung, D. Kim, C. Kim, K. Okamoto, R. H. Wagoner, K. Chung, 2009, Experimental and Numerical Study on Formability of Friction Stir Welded TWB Sheets Based on Hemispherical Dome Stretch Tests, Int. J. Plasticity, Vol. 25, No. 9, pp. 1626-1654. 

이 논문을 인용한 문헌 (2)

  1. Kim, Y.I. ; Kim, J.H. ; Kim, Y. ; Lee, M.Y. ; Moon, Y.H. ; Kim, D. 2011. "Formability Evaluation of Tailor Welded Blanks of Boron Steel Sheets by Erichsen Cupping Test at Elevated Temperature" 소성가공 = Transactions of materials processing : Journal of the Korean society for technology of plastics, 20(8): 568~574 
  2. Sim, Kijoong ; Cho, Wonyoung ; Kim, Youngkwan ; Choi, Kyujae 2014. "Laser Welding Properties of the S45C using Automobile Brake Parts" 한국자동차공학회논문집 = Transactions of the Korean Society of Automotive Engineers, 22(1): 103~109 

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