Effects of alloying elements on the growth of iron boride coatings

Evaluation of the tool life and fracture toughness of cutting tools boronized by the paste boriding process

“…Considering the boron carbide paste thickness used in the process and the temperature range 1173 K T 1273 K, the average values of the boride layer thicknesses (considering FeB + Fe 2 B) were 18 AE 1.5 at the temperature of 1173 K and 40 AE 4 mm for the temperature of 1273 K. The EDS analysis (see Fig. 7(c)) establishes that the alloying elements, such as Cr, Ni, Mo, Vand W, are dissolved in the borided layers, however, these alloying elements inhibit the growth of the layers because, by a substitutional procedure, they are concentrated at the tips of the boride columns decreasing, in this way, active boron flux on these zones and therefore, reducing the columnar shape of the growth in comparison with low alloying borided steels [18,21].…”

Corrosion behavior of boride layers evaluated by the EIS technique

“…The control of boron paste thicknesses in this process (in the range of 3-5 mm) can generate layers thicknesses from 30 to 200 mm (taking into account the influence of time and temperature), particularly in ARMCO iron and medium and low carbon steels [5][6][7]. The corrosion resistance of boride-coated steels greatly depended on the amount of porosity and microcracking in the coating.…”

Effect of Fe 2 B orientation on erosion–corrosion behavior of Fe–3.5 wt.% B steel in flowing zinc

“…Moreover, the Fe 2 B phase has an orthorhombic structure [29,30], whose longitudinal axis is favorable for the nucleation of the Fe 2 B grains. As in previous studies [31][32][33], these grains grow preferentially along the [0 0 2], which is opposite to the heating squeezed direction.…”