DOI QR코드

DOI QR Code

Development of a Cast Tool Steel with Excellent Performance for Application to Cold-Work Press Dies

냉간프레스금형용 고성능 주강 개발

  • 강전연 (한국기계연구원 부설 재료연구소) ;
  • ;
  • 김병환 (한국기계연구원 부설 재료연구소) ;
  • 김호영 (주식회사 센트랄, 재료연구팀)
  • Received : 2018.09.28
  • Accepted : 2018.10.15
  • Published : 2018.11.30

Abstract

The microstructure of a newly developed alloy tool steel (KV1) for casting cold-work press dies was analyzed using advanced scanning electron microscopy. Its mechanical properties and durability in use as piercing inserts were tested. It contained a continuous network structure which originated from the micro-segregation during solidification and was composed of retained austenite and primary carbides. However, after quenching and tempering, its continuity was destroyed due to the decomposition of austenite. The discontinuous spatial distribution and the smaller amount of primary carbide in the network presented KV1 enhanced ductility compared to the common alloy (HK700). The reduced C and Cr, the addition of V resulted in a small amount of primary carbides which primarily consisted of MC, as well as fine and uniform dispersion of precipitates. Owing to these features, KV1 exhibited delayed initiation of chipping when used for piercing inserts.

Keywords

References

  1. KS D 3753 : Korean Agency for Technology and Standards (2008).
  2. A. Johansson : Uddeholm Cast Tool Steels, http://extra.ivf.se/verktyg/download/Cast%20Tool%20Steels%20Uddeholm.pdf
  3. J.-Y. Kang, J.-Y. Park, H. Kim, B. Kim : J. of the Korean Society for Heat Treatment, 30 (2017) 197-206.
  4. ASTM A 597 : ASTM International (2014).
  5. Daido steel : patent JP 1996-137419.
  6. Daido steel : patent US 09/048301.
  7. Daido steel : patent JP 1998-260784.
  8. Hyundai motors-K. P. C. : patent KR 2001-0029963.
  9. Hyundai motors-K. P. C. : patent KR 2001-0029962.
  10. ASTM E 18 : ASTM International (2015).
  11. ASTM C1161 : ASTM International (2013).
  12. KS L 1591 : Korean Agency for Technology and Standards (2013).
  13. J.-Y. Kang, H.-Y. Ha, M.-H. Jang, J. Moon, D.-W. Suh, T.-H. Lee: Scr. Mater., 102 (2015) 63-66. https://doi.org/10.1016/j.scriptamat.2015.02.014
  14. H. Kim, J.-Y. Kang, D. Son, T.-H. Lee, K.-M. Cho : Mater. Charact., 107 (2015) 376-385. https://doi.org/10.1016/j.matchar.2015.08.001
  15. H. Brandis, E. Haberling, H. H. Weigard : Processing and Properties of High Speed Tool Steels, M. G. H. Wells, L. W. Lherbier, eds., TMS-AIME (1980), pp. 1-18.
  16. G. Roberts, G. Krauss and R. Kennedy : Tool Steels, 5th ed, ASM International, Materials Park, OH (1998) p. 59.
  17. J. O. Anderson, T. Helander, L. Hoglund, P. F. Shi, B. Sundman: Calphad, 26 (2002) 273-312. https://doi.org/10.1016/S0364-5916(02)00037-8
  18. Thermo-Calc Software TCFE7 Steels/Fe-alloys database version 7 (2012).
  19. G. H. Gulliver : J. Inst. Met., 9 (1913) 120-157.
  20. E. Scheil : Z. Metallkd., 34 (1942) 70-72.
  21. A. Jansson, B. Sundman : Ph.D. thesis, KTH, Stockholm (1997).
  22. K. Fukaura, Y. Yokoyama, D. Yokoi, N. Tsujii, K. Ono: Metall. Mater. Trans. A, 35A (2004) 1289-1300.
  23. H. Kim, J.-Y. Kang, D. Son, D. S. Lee, T.-H. Lee, W. C. Jeong, K.-M. Cho : J. of the Korean Society for Heat Treatment, 27 (2014) 242-252. https://doi.org/10.12656/jksht.2014.27.5.242
  24. J.-Y. Kang, H. Kim, D. Son, J.-J. Lee, H. Y. Yun, T.-H. Lee, S. K. Park: J. of the Korean Society for Heat Treatment 28 (2015) 181-189. https://doi.org/10.12656/jksht.2015.28.4.181
  25. J.-Y. Kang, H. Kim, D. Son, J.-J. Lee, H. Y. Yun, T.-H. Lee, S.-J. Park, S. K. Park : J. of the Korean Society for Heat Treatment 28 (2015) 239-249. https://doi.org/10.12656/jksht.2015.28.5.239