Zn coating behavior during hot stamping process
- Zn coating behavior during hot stamping process
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- The two main difficulties associated with the use of hot-dip galvanized steel for hot stamping are Zn evaporation and liquid metal induced embrittlement (LMIE). The Zn evaporation is a consequence of the low melting temperature and high partial pressure of Zn. LMIE occurs during plastic deformation at high temperature due to liquid Zn and the applied stress. In this contribution, the coating evolution of hot-dip galvanized hot stamping steel was studied in detail. The suppression of the Zn evaporation by a surface oxide layer was investigated by simulating the hot stamping process in two different gas atmospheres, air and Ar. The mechanism of LMIE of hot-dip galvanized hot stamped steel was clarified. An increase of the annealing time prior to stamping was shown to be an effective way to prevent of LMIE by eliminating the liquid Zn phase.
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