Universidad Rey Juan Carlos
Multimaterials have been fabricated by alternating layers of 316L ss and a mixture of 90 % of 316L ss with 10 % of Ti6Al4V. The effect of the atmosphere (argon and nitrogen) and of the thickness of each material type has been determined. Austenitic grains and FeTi were formed in all the materials. Fe2Ti appeared when the composition of mixed powder was increased. These intermetallic layers had a ferromagnetic behavior with the ability of orientating magnets in the layer direction. Hardness of the samples increased up to 450 HV0.1, which is significantly higher than the hardness of the 316L ss. The zones with intermetallic precipitates are more noble than the stainless steel only ones, but they had higher corrosion current density due to the presence of the galvanic couples between materials. Pitting attack was favored in the interface between the 316L ss and the intermetallics. In general, thinner bands of mixed powder and the use of nitrogen atmosphere improve the corrosion behavior of the multimaterals.
Abstract
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