Zn Coating Behavior during Hot Stamping
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 grain boundary penetration in the presence of tensile stresses.In this contribution,the evolution of the coating microstructure on hot-dip galvanized steel during the hot stamping process 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 LMIE by eliminating the liquid Zn phase prior to stamping.
Hot stamping Galvanized steel Liquid metal induced embrittlement
LEE Chang Wook FAN Dong Wei LEE Seok-Jae SOHN Il Ryoung DE COOMAN Bruno C
Graduate Institute of Ferrous Technology,Pohang University of Science and Technology,Pohang 790-784, POSCO Technical Research Laboratories 545-090,Gwangyang,Korea
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-5
2012-09-23(万方平台首次上网日期,不代表论文的发表时间)