Mechanical properties of FeB and Fe2B layers estimated by Berkovich nanoindentation on tool borided steel

Rodríguez-Castro, G.A.; Campos-Silva, I.; Chávez‐Gutiérrez, Edwin; Martínez-Trinidad, J.; Hernández-Sánchez, Enrique; Torres-Hernández, A.

doi:10.1016/j.surfcoat.2012.05.145

Cited by 78 publications

(22 citation statements)

References 26 publications

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“…Within these treatments, boriding is a surface modification, whereby boron is diffused into, and combines with, the substrate material resulting in the formation of iron borides. Depending on the temperature and time of the process, the chemical composition of the material and boron potential of the surrounding medium can form a single phase Fe 2 B or double phase (FeB / Fe 2 B) with defined composition [2][3][4][5] . Boriding can be attained by different mediums as solid, liquid and gaseous.…”

Section: Introductionmentioning

confidence: 99%

Damage Mechanisms in AISI 304 Borided Steel: Scratch and Daimler-Benz Adhesion Tests

et al. 2015

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In this study, damage mechanisms in the FeB/Fe 2 B coatings formed on the surface of AISI 304 steel are determined by adhesion tests. First, the boriding of the AISI 304 steel was carried out through the powder-pack method at 1223 K in the range from 2-10 h of exposure time. After treatment, Berkovich depth-sensing indentation test were conducted; the result showed tensil and compressive residual stresses in the FeB and Fe 2 B, respectively. The adhesion of borided steels was evaluated by the Daimler-Benz Rockwell-C and scratch test. Based on the scratch tracks, the chipping was the predominant mechanism at 2 and 6 h, with critical loads of 35 and 43 N, respectively; while spalliation was determined at 27 N for 10 h. Also, hertzian and tensil cracks, buckling and compressive delamination were determined in the AISI 304 borided steel by scanning electron microscope.

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Section: Introductionmentioning

confidence: 99%

Damage Mechanisms in AISI 304 Borided Steel: Scratch and Daimler-Benz Adhesion Tests

et al. 2015

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“…1) because the required time for this process depends mainly on the temperature, 6) which is relatively low (850°C) in this stage. In addition, in previous work 25) we reported that Fe 2 B phase is more elastic than FeB, so an Fe 2 B single-phase layer is expected to be more resistant to abrasive wear, as can be seen in Fig. 5(a).…”

Section: Wear Testsmentioning

confidence: 71%

Tribological Behavior of Borided AISI 316L Steel with Reduced Friction Coefficient and Enhanced Wear Resistance

et al. 2019

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This study evaluates the tribological behavior of borided AISI 316L steel. The treatment time was set to 2, 4, and 6 h at temperatures of 850, 900, and 950°C for each time duration. The morphology and microstructure of the boride layers were analyzed by scanning electron microscopy (SEM) and X ray diffraction (XRD), respectively. The mechanical properties were evaluated by an instrumented nanoindentation test. The tribological behaviors of the layers were evaluated using a sand/rubber apparatus following the ASTM G-65 standard. The friction coefficient of the boride layers was estimated by means of the tribological pin-on-disk test. The results show that the experimental parameters had a clear influence on the thickness of the boride layers and on their mechanical properties. The volume loss was established in the range of 0.0741 « 0.011 µg to 1.6148 « 0.150 µg. Wear mechanisms such as adhesion and micro-fatigue were mainly observed in the samples exposed for 6 h at 950°C. Finally, the friction coefficient was reduced from 0.7 for the as-received material down to 0.29 for the borided samples. The wear mechanisms were discussed as a function of the scanning electron microscopy observations. It is possible to conclude that single-phase layers of Fe 2 B are more apt to face wear than the FeB/Fe 2 B biphasic layers.

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“…The highest hardness of the boride layers was directly related with the highest boron content into the layer, 20) so that, it is valid to assume that the boride layer can provide enough boron for the formation of a homogenous H 3 BO 3 film (see Fig. 3(b)).…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Development of Ultra-Low Friction Coefficient Films and Their Effect on the Biocompatibility of Biomedical Steel

et al. 2019

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This study evaluates the effect of a self-lubricant film with ultra-low friction coefficient on the biocompatibility of the AISI 316L. The samples were thermochemically treated to generate a hard surface layer of iron borides followed by a secondary process. The purpose of the secondary process was to generate a self-lubricant film of boric acid. The ultra-low friction coefficient of boric acid films was estimated in 0.02 compared to 0.2 and 0.8 for borided and as-received AISI 316L steel respectively. The effect of the boric acid films on the steel's biocompatibility was evaluated by the culture of Madin-Darby canine kidney II (MDCK II) cells with exposure times of 0, 4, 8, 12, 24, 48 and 72 h. The In vitro tests revealed the absence of cytotoxic effect by the direct exposure of the cells to the samples. Additionally, the presence of signs early apoptosis by the determination of the expression of the cysteinyl proteases termed caspase-3 and-9 was determined. Their presence was assessed by indirect immunofluorescence in cells in direct contact with the samples. No significant expression of the proteolytic enzymes was detected. All these results suggest that the surface film of boric acid does not induce any cytotoxic effect and does not inhibit the cell-cell adhesion.

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Mechanical properties of FeB and Fe2B layers estimated by Berkovich nanoindentation on tool borided steel

Cited by 78 publications

References 26 publications

Damage Mechanisms in AISI 304 Borided Steel: Scratch and Daimler-Benz Adhesion Tests

Damage Mechanisms in AISI 304 Borided Steel: Scratch and Daimler-Benz Adhesion Tests

Tribological Behavior of Borided AISI 316L Steel with Reduced Friction Coefficient and Enhanced Wear Resistance

Development of Ultra-Low Friction Coefficient Films and Their Effect on the Biocompatibility of Biomedical Steel

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