Transactions of Materials and Heat Treatment

Title：Process research on improving hot stamping steel ductility

Authors： WANG Cun-yu SHI Jie HUI Wei-jun CHEN Ying ZHANG Ying-jian DONG Han

Unit： Central Iron & Steel Research Institute

KeyWords： hot stamping martensite ductility

ClassificationCode：TG306

year,vol(issue):pagenumber：2011,36(2):128-130

Abstract：

Lower ductility is a disadvantage of traditional hot stamping steels. Water cooled punch and elevated temperature die (200 ℃) were employed to hot stamping, the temperature evolution during hot stamping was measured, the microstructure and mechanical properties were characterized. The results show that the cooling rate of blank decreases with the increasing of die temperature. The application of elevated temperature die could meet the requirement of quenching and fully martensite microstructuris obtained. The ability of self temper and the yield strength are improved. At the same time, the internal stress is reduced and the ductility and the product of tensile strength are improved clearly.

Funds：

国家863资助项目（2009AA033401）、（2009AA03Z519）

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