Metals and Materials International

, Volume 19, Issue 4, pp 629–635 | Cite as

Effect of Zr addition on phase transformation and precipitation in B-added hot stamping steel

  • Moon-Jo Kim
  • Hoon-Hwe Cho
  • Sung-Hwan Kim
  • Seung Man Nam
  • Seung-Ha Lee
  • Man-been Moon
  • Heung Nam HanEmail author


The effect of Zr addition on phase transformation and precipitation in B-added hot stamping steels was investigated. First, a thermodynamic calculation was conducted to compare the thermodynamic stability of nitride precipitates for various nitride-forming elements. The equilibrium temperatures for phase transformation and nitride precipitation in B-added hot stamping steels containing Zr were also calculated. The phase transformation kinetics of B-added hot stamping steels with various Zr contents were evaluated by both dilatometry and metallography. It was verified that Zr addition can provide protection of the B-hardenability effect, which produce a fully martensitic microstructure after hot stamping. To confirm the existence of Zr precipitation in the hot stamping steels, transmission electron microscopy and energy dispersive spectroscopy were used. A large number of precipitates were observed in the form of (Ti, Zr)N. The effect of Zr addition in B-added hot stamping steel to provide effective B-protection resulting in an increase of hardenability was identified and discussed.

Key words

alloys phase transformation precipitation dilatometry transmission electron microscopy 


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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Moon-Jo Kim
    • 1
  • Hoon-Hwe Cho
    • 1
  • Sung-Hwan Kim
    • 1
  • Seung Man Nam
    • 2
  • Seung-Ha Lee
    • 3
  • Man-been Moon
    • 2
  • Heung Nam Han
    • 1
    Email author
  1. 1.Department of Materials Science & Engineering and Center for Iron & Steel ResearchSeoul National University, RIAMSeoulKorea
  2. 2.Technical R&D CenterHyundai HYSCOChungcheongnam-doKorea
  3. 3.Technical R&D CenterHyundai SteelChungcheongnam-doKorea

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