Structural Characterization of Boro-Titanized AISI 1040 Steel

O. Kona, S. Pazarlıoğlub, M. Durmazc, U. Senc, S. Senc aSakarya University, Technical Education Faculty, Metal Education Department, 54187, Serdivan Sakarya, Turkey bMarmara University, Technical Education Faculty, Metal Education Department, 34722, Istanbul Turkey cSakarya University, Engineering Faculty, Department of Metallurgy and Materials Engineering, 54187, Sakarya, Turkey

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In this study, boro-titanizing treatment was applied to AISI 1040 steel. In the coating treatment, steel samples were pre-boronized in a slurry salt bath consisting of borax, boric acid and ferro-silicon at 900°C for 2 h, then titanized by thermo-reactive deposition technique (TRD) in a powder mixture consisting of ferro-titanium, ammonium chloride, alumina and naphthalene at 1000°C for 1-4 h. The coated samples were characterized by X-ray diffraction analysis (XRD), scanning electron microscope (SEM), glow discharge optical emission spectroscopy (GDOES) and micro-hardness tests. Coated layer formed on the pre-boronized AISI 1040 steel was compact and homogeneous. X-ray studies showed that the phases formed on the steel surfaces are TiB2, TiC, TiN and Fe2B. The depth of the coating layer ranged from 3.41± 0.47 μm to 6.59± 0.51 μm, depending on treatment time. A higher treatment time resulted in a thicker boro-titanized layer. The average hardness of the coating layer was 4527± 284 HV0.005.

DOI: 10.12693/APhysPolA.127.1211 PACS numbers: 81.65.Lp, 62.20.Qp