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Metallurgical and Materials Transactions A

, Volume 43, Issue 13, pp 5122–5127 | Cite as

Liquid-Metal-Induced Embrittlement of Zn-Coated Hot Stamping Steel

  • Chang Wook Lee
  • Dong Wei Fan
  • Il Ryoung Sohn
  • Seok-Jae Lee
  • Bruno C. De Cooman
Article

Abstract

Liquid-metal-induced embrittlement (LMIE) of galvanized hot stamping steel occurs due to the simultaneous application of stress and the presence of a liquid Zn surface layer during the hot stamping process. The mechanism specific to the liquid metal induced embrittlement occurring during hot stamping was investigated in detail. It was found that when a tensile stress was applied, liquid Zn could penetrate along grain boundaries in the steel matrix at temperatures above the Liquid + α-Fe (Zn) → Γ1 peritectic transformation temperature of 1055 K (782 °C). The results show that an increase of the annealing time prior to hot stamping is an effective way to prevent LMIE by the elimination of the liquid phase.

Keywords

Austenite Cathodic Protection Galvanize Steel Steel Matrix 22MnB5 Steel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors gratefully acknowledge the support of POSCO. The suggestions of Dr. Nai-Yong Tang, Teck Metals, with regard to interpretation of the results reported in the manuscript are greatly appreciated.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2012

Authors and Affiliations

  • Chang Wook Lee
    • 1
  • Dong Wei Fan
    • 1
    • 2
  • Il Ryoung Sohn
    • 3
  • Seok-Jae Lee
    • 1
  • Bruno C. De Cooman
    • 1
  1. 1.Graduate Institute of Ferrous Technology (GIFT)POSTECHPohangKorea
  2. 2.ArcelorMittal Global R&DEast Chicago USA
  3. 3.Technical Research LaboratoriesPOSCOGwangyangKorea

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