Akademik Veri Yönetim Sistemi
COST Action CA21121 MecaNano General Meeting 2023, Madrid, İspanya, 26 - 27 Nisan 2023, ss.1
Advanced high strength steels (AHSS) offer various
benefits for automotive applications including lightweighthing through use of
thinner sheet blanks without compromising strength, and safety. Among di_erent
AHSS grades, dual-phase steels offer improved strength and ductility thanking
to their ferrite matrix (provides ductility) and martensite (provides
strength). This study aimed to reveal the effect of deformation on the mechanical
properties of two DP steel grades, namely DP 1000, and DP 1200 by employing
maximum load-controlled indentation with a Berkovich type of indenter. The
maximum indentation loading of 6 mN was employed and 400 indentations (20x20)
were performed in matrix form and with 10 µm spacing. The loading scheme was
loading for 5 s, holding it for 2 s, and then unloading at 5 s. To reveal the
effect of deformation, the DP 1000 and DP 1200 materials in plate form were
subjected to 3-point bending test that surpassed the yield point of the
material. Then, two samples were extracted from the most deformed, and
undeformed (or significantly less deformed) zones. The nanoindentation was
applied both to deformed and undeformed sections of the investigated dual-phase
steels. Hardness and modulus of elasticity values obtained are mapped for the
investigated area. In addition, EBSD measurements were performed to establish
microstructure-property relation. It was revealed that the Hardness values were
relatively in a narrow range denoting the overall response of the
microstructure rather than the ones for individual phases. In addition, the
effect of deformation is more pronounced for DP 1000.