...M. Keddam; M. Kulka In this work, two mathematical approaches were used in order to determine the values of activation energies in the iron monoboride (FeB) and diiron boride (Fe 2 B) layers on AISI M2 steel. The required experimental data about the boriding kinetics of AISI M2 steel were taken...

...O. Azouani; M. Keddam; O. Allaoui; A. Sehisseh In the present work, the EN-GJL-250 gray cast iron was pack-borided in a powder mixture consisting of 5 % B 4 C, 5 % NaBF 4 , and 90 % SiC. The boriding treatment was carried out in the temperature range 900°C–1000°C during 2, 4, and 6 h...

... such as boriding can further extend its range of use. In this work, gray cast iron samples with the composition 3.6 % C - 2.1 % Si - 0.43 % Mn - 0.26 % Cr - bal Fe were subjected to austempering treatment using austenitizing at 900°C, with subsequent cooling using austempering salt baths at temperatures of 240°C...

... situations. However, because they cannot harden by heat treatment, they exhibit low wear resistance. Suitable coatings can increase their wear resistance and expand their usability range. Boride coatings, with their high hardness and wear resistance are a good candidate for this purpose. In this work...

...T. L. Christiansen; F. Bottoli; K. V. Dahl; N. B. Gammeltoft-Hansen; M. B. Laursen; M. A. J. Somers Thermo-reactive deposition and diffusion (TRD) and boriding are thermochemical processes that result in very high surface hardness by conversion of the surface into carbides/nitrides and borides...

...F. E. Mariani; G. S. Takeya; L. C. Casteletti; A. N. Lombardi; G. E. Totten In this study, the growth kinetics of NbB 2 (niobium boride) layers on pure niobium by boriding was described. The boronizing process was performed in a salt bath composed of borax (sodium borate) and aluminum (10 wt...

... of 2300 HV, composed of niobium carbide but with limited thickness. Boriding also produces very hard coatings, on order of 2000 HV, but with a much thicker layer than attainable by the niobizing treatment. If both were applied to the same material they could potentially complement each other by forming...

...S. C. Heck; A. L. Neto; C. A. Picon; G. E. Totten; L. C. Casteletti This work investigates the effect of pack boriding time and temperature on the wear and corrosion resistance of AISI H13 tool steel. Steel samples were pack borided at 900 and 1000°C for periods of 2 and 4 h; followed by non...

... of the base material. However, in some applications, the wear resistance may not be sufficient. To further improve the wear resistance of these coatings, a thermochemical boriding treatment can be subsequently applied to produce a duplex coating. In this work, an SAE 1020 steel was used as the substrate...

...R. G. Pereira; F. E. Mariani; A. L. Neto; G. E. Totten; L. C. Casteletti Boride layers with high hardness and wear resistance were produced on AISI D2 tool steel by thermo-reactive treatment using borax with the addition of 10 wt. % aluminum. Subsequently, PVD treatments were performed...

..., sometimes an even greater wear resistance is required for optimal results. In such cases, a secondary treatment may be performed to produce a duplex coating. The objective of this work is to evaluate the wear resistance of a borided flame-sprayed duplex coating using an AISI 410 martensitic stainless steel...