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Transformation Induced Plasticity "TRIP" Steel
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=== Improving the galvanized surface finish of TRIP steels === Hot-dip galvanizing{{W|Hot-dip galvanizing}} is a widely used surface treatment for steels. During the process, molten zinc bonds with the iron to form a layer which protects against corrosion. Original TRIP steels only contained silicon as the alloying element used to suppress the formation of the cementite phase. The content of silicon in these alloys was approximately 1.5 % by weight. This relatively high silicon content formed silicon oxide at the surface of the steel prior to the galvanizing process.<ref name="[10]">Wolfgang Bleck, "Using the TRIP effect β the dawn of a promising group of cold formable steels", International Conference on TRIP-Aided High Strength Ferrous Alloys</ref> This oxide severely degraded the properties of the galvanized surface coating.<ref name="[4]">S. Chatterjee & Al., "Delta TRIP steel", Materials Science and Technology, Vol 23 No 7,819-827, 2007.</ref> Newer TRIP steels have partially or completely replaced silicon with aluminium as an alloying component. The aluminium plays the same role as the silicon, but does not have negative effects on the surface finish during galvanizing. Therefore, the silicon content can be reduced while maintaining the TRIP properties of the steel.
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