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The Structural Properties of Fe-Ti-B Based Alloys Produced by Mechanical Alloying

100%

Kon O., Sen U.

Acta Physica Polonica A

2015

vol. 127

issue 4

1214-1217

In the present study, the production of Fe-Ti-B based alloys was realized and their structure and properties were investigated. Mechanical alloying proceeds by the continual cold welding and fracturing of the constituent mixture of Ti+4B+5Fe powder when subjected to the large compressive forces of a high speed mill. The powder charge together with 7 mm diameter steel balls were loaded into a tool steel grinding container at approximately 350 RPM for 20 h. The samples were shaped as cylinder of Ø15×8 mm dimensions by uniaxial pressing at 450 MPa. Then, the green body materials were produced by sintering at 1100°C for 1-4 h in argon atmosphere. The morphology of composite materials was investigated by optical microscopy and scanning electron microscopy and phase analysis was realized by x-ray diffraction analysis. The bulk densities of the materials were measured using by Archimedes method. Also, the micro-hardness of the samples was measured by Vickers indentation technique. As a result, Fe, iron boride (FeB, Fe₂B) and titanium boride (TiB₂) phases were detected in the phase analysis of the Fe-Ti-B based materials. The hardness of the materials was measured between 1107 HV_{0.05} and 1551 HV_{0.05}, depending on sintering time. The densities of the samples were determined between 4.205 g/cm³ and 4.219 g/cm³.

Structural Characterization of Boro-Titanized AISI 1040 Steel

71%

Kon O., Pazarlıoğlu S., Durmaz M., Sen U., Sen S.

Acta Physica Polonica A

2015

vol. 127

issue 4

1211-1213

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 HV_{0.005}.

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2 Acta Physica Polonica A

2 2015

2 Kon O.

2 Sen U.

1 Durmaz M.

1 Pazarlıoğlu S.

1 Sen S.

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The Structural Properties of Fe-Ti-B Based Alloys Produced by Mechanical Alloying

Structural Characterization of Boro-Titanized AISI 1040 Steel