In today's automotive industry, the goal to lower CO2 emissions is the driving force in material development in a wide range of applications. This ecological stimulus is also influencing the body-in-white design where full exploitation of light weight potential becomes increasingly important. When using high strength steel (HSS), a reduction in thickness leads to a weight reduction of the overall car body frame while maintaining the crash-worthiness of the construction. However, steels having a tensile strength greater than 1000 Mpa (145,000 psi) may fail due to hydrogen embrittlement (HE) under certain circumstances (hydrogen content vs. stresses vs. microstructure). This still hinders the use of the highest strength steels in the body in white. These steels include dual phase (DP), complex phase (CP), martensitic phase, and TRIP (transformation induced plasticity) steels. This article describes a methodology to rank the different steels regarding their susceptibility to hydrogen embrittlement with respect to their microstructure and respective strength level. Several approaches, such as static and quasistatic tensile testing, under various atmospheres and hydrogen loading conditions are illustrated. The investigations yield a better understanding of microstructural influence on the failure mode due to hydrogen embrittlement in general, and will help in designing guidelines for the use and selection of high strength steels in body in white development and manufacture processes.
Hydrogen embrittlement in HSSs limits use in lightweight bod
Wasserstoffversprödung in HSS begrenzt die Anwendung in Leicht-Karosserien
Advanced Materials & Processes ; 169 , 3 ; 22-25
2011
4 Seiten, 6 Bilder, 2 Tabellen, 2 Quellen
Aufsatz (Zeitschrift)
Englisch
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