Structural Characterization Of Iron Aluminide Coatings On Aisi 4140 Steel By Trd

Structural Characterization Of Iron Aluminide Coatings On Aisi 4140 Steel By Trd

Ugur , Sen

In the present study, structural characterization of iron aluminide coated AISI 4140 steel by thermo-reactive deposition technique (TRD) in the powder mixture consisting of pure aluminum, ammonium chloride and alumina at the temperatures of 700°C, 800°C and 900ºC for 1-5 h were investigated. The coated samples were characterized by X-ray diffraction, scanning electron microscope and micro-hardness tests. Iron aluminide layer formed on the AISI 4140 steel was smooth, compact and homogeneous. The phases formed in the coating layer deposited on the surface of the steel substrates are Fe2Al5, FeAl2, AlN and Al2O3. The depth of the iron aluminide layer ranged from 37.56±3.46 μm to 280.38±21.58 μm, depending on treatment temperature and time. The higher the treatment temperature and time the thicker the coating layer observed. The hardness of the iron aluminide layer was ranged from 952.4 to 1003.2 HV0.005. Keywords: Coating, aluminizing, iron aluminide, thermo reactive deposition

Conference or Workshop Item
PeerReviewed

2012-05-31

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