Abstract
<p class="1Body">Two different concepts of electrically assisted (EA) rapid heating of Al–Si coated hot-stamping steels are compared. In “along the surface” EA heating (or simply EA surface heating), the electric current is simply applied to a specimen by clamping the each end of the specimen length with a set of flat rectangular electrodes. In “through the thickness” EA heating (or simply EA thickness heating), the electric current is applied to a specimen by attaching a set of electrodes with multiple contact points on upper and lower surfaces of the specimen. While the EA surface heating generally requires a shorter heating time due to a higher electrical resistance in the length direction, the EA thickness heating also may provide a technical advantage that the heating area can be more easily configured in a case of partial austenization.</p>
Highlights
Due to the demand for weight reduction of vehicle, improved safety and crashworthiness qualities, increasing hot stamping parts are used for automobile structural components from ultra-high strength steel (Chao, Yisheng, XiaoWei, Bin, & Jian, 2012)
In “along the surface” electrically assisted (EA) heating, the electric current is applied to a specimen by clamping the each end of the specimen length with a set of flat rectangular electrodes
In “through the thickness” EA heating, the electric current is applied to a specimen by attaching a set of electrodes with multiple contact points on upper and lower surfaces of the specimen
Summary
Due to the demand for weight reduction of vehicle, improved safety and crashworthiness qualities, increasing hot stamping parts are used for automobile structural components from ultra-high strength steel (Chao, Yisheng, XiaoWei, Bin, & Jian, 2012). It has been reported that the full martensitic parts are in nature of high strength (1000 – 1500 MPa) and poor ductility generally less than 5% (Zhu, Zhang, Li, Wang, & Ye, 2011). Such types of high strength steel but low ductile parts are not suitable especially for energy absorbing parts of automotive vehicles (Wang, & Liu, 2014). The safety improvement of vehicles and the compatibility of mechanical properties have been reported that various mechanical properties are needed in different regions or joints of the same parts Such properties are similar as tailored properties (Liang, Wang, & Liu, 2014). The automotive part as A-pillar and B-pillar which can be formed by such tempering and meet the crashworthiness requirement of roof and side
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