Effect of V Content on Microstructure and Properties of Automotive Collision Materials
In this paper,by means of optical microscope,scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and electronic universal testing machine,the effects of V content on the structure,mechanics,bending and intergranular corrosion of automobile anti-collision beam profiles are studied.The experimental results show that as the V content increases,the grain size first decreases and then increases,with a minimum at 0.15%V.Mechanical performance tests show that the yield strength and work hardening index n values increase most significantly at 0.15%V.After natural aging,0.15%V alloy has the best stability;After artificial aging,its strength increases the most,and it has good formability and aging strengthening properties.The bending angle increases with the increase of V content,with the maximum value at 0.15%V and the minimum difference between TD and RD angles.All four alloys exhibit intergranular corrosion,and changes in V content have little effect on corrosion resistance.But when the V content reaches 0.20%,the bending angle decreases,attributed to the formation of Al11 V phase.
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