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Research of the dual phase steel DP450 properties from the forming aspects DOI:10.15199/24.2019.1.3

  Introduction. Automotive industry has significant sha􀀐 re on worldwide industrial production. Significantly con􀀐 tributes to research and development of new materials, development of new production methods and production operations. One of steel types developed and used especial􀀐 ly in automotive industry are dual phase steels. Because of this the paper studies plasticity and formability DP 450 dual phase steel with focus on processing by drawing. This steel is used for example for pillar lining and front fender pro􀀐 duction for C3 Picasso car [1, 2]. Studied material. The material DP 450 is dual phase steel, galvanized and cold rolled with thickness s = 1.17 mm. Chemical composition of the steel and required me􀀐 chanical properties are in tables 1 and 2. Microstructure analysis and microhardness measurement of studied material. Optical microscopy was used for basic microstructure analysis of metallographically pre􀀐 pared cross cuts of samples from experimental material. NEOPHOT 30 optical microscope was used for analysis. Metallographic preparation of samples consisted from: - sample extraction - from test sheets samples with length of approximately 15 mm were cut from various lo􀀐 cations, - mechanical grinding - by set of metallographic Table 1. Chemical composition of the DP 450 steel, mass % Tablica 1. Skład chemiczny stali DP 450, % mas. C Mn Si P S 0.05 to 0.10 0.05 to 1.60 < 0.40 < 0.04 < 0.015 Al Nb Ti V Cr 0.02 to 0.08 < 0.01 < 0.01 < 0.01 < 0.80 Table 2. Required mechanical properties of the DP 450 steel Tablica 2. Wymagane własności mechaniczne stali DP 450 Yield strength Rp0,2 [MPa] Tensile strength Rm [MP[...]

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