Mechanical properties and fracture behavior of high-strength steels |
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Authors: | R Mu?álek P Hau?ild J Siegl J Bensch J Sláma |
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Affiliation: | (1) Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Czech Technical University, Prague, Czech Republic;(2) TKZ, ŠKODA AUTO a.s., Mladá Boleslav, Czech Republic |
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Abstract: | Typical thicknesses of high-strength steels (HSS) sheets used in the car industry are inapplicable for standardized testing
procedures. The aim of this study is to propose an appropriate methodology for testing and comparing of thin HSS sheets. Microstructures
were observed by means of light and scanning electron microscopy. The modified Charpy impact tests and fracture toughness
tests were used in order to compare the fracture properties of three different HSS sheets (Docol 1200 M, Multiphase 1200 and
BTR 165). Ductile-to-brittle transition curves and tearing resistance (J − Δa) curves were measured. From the fracture toughness
linked to the specimen thicknesses the value of fracture toughness KIc was estimated. Fractographic analysis of broken specimens has revealed that due to the fine microstructure of mixed ferrite-martensite
fracture mechanism remains ductile even at low temperatures (down to −100°C).
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Translated from Problemy Prochnosti, No. 1, pp. 155–158, January–February, 2008. |
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Keywords: | fracture toughness Charpy impact energy fractography high-strength steel |
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