Hot Stamping of Two Different High Strength Steel with Tailored Properties

Abstract

With the increasingly widespread application of high-strength steel (HSS), tailored properties, namely different mechanical properties required in different regions of the same part, have been proposed, in order to achieve the matching between mechanical properties and safety performance of motor vehicle parts. In this paper, the influence of air gap on the final hardness and strength distribution is discussed in terms of two different HSS, namely LG1500HS and WHT1500HF. As for steel LG1500HS, regardless of the location of samples in the formed part, the final fracture area is in the vicinity of the air gap center, proving the lowest hardness and strength in transition zones. Compared to steel LG1500HS, steel WHT1500HF exhibits gradient hardness distribution from the cooling zone to the heating zone, with no minimal value discovered in transition zones.

Valuation Method for Effects of Hot Stamping Parameters on Tailored Properties

“…The paper is aimed to evaluate the effects of hot stamping parameters including die temperature and holding pressure on tailored properties. This paper extends and consolidates the work described in Wang [5] and Xu [6]. Orthogonal experiment method was used and the results were discussed.…”

Application of Magnetic Barkhausen Noise Test System in Hot Stamping

“…The HSS strip with tailored properties was prepared by a flat die [10].The dimension of the strip is 120 mm × 20 mm × 1.8 mm. The die consists of low and high temperature dies.…”

Research and Progress of Hot Stamping in China

“…Partial hardening of part was also conducted by controlling different heating temperature at different field in the furnace proposed by [21]. This technology requires a study of phase transformation kinetics, transformation plasticity, The microstructure evolution of transition zone, heat transfer performance of heating, control method of temperature, cooling path, and thermal coupling simulation，reference [22] has attempted to do some related research works and obtained a certain effect. The change of strength in transition zone was more flexibility than that of TWB technology.…”