Distribution of carbon below the boride coating on carbon steels

Lyakhovich, L. S.; Kosachevskii, L. N.; Khusid, Boris; Turov, Yu. V.

doi:10.1007/bf00680416

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Journal Of Adhesion Science and Technology 20691

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“…Carbon in the steels is not soluble in the boride layer and generally accumulates between steel and boride layer saw-teeth structure. [21] However, Cr is incorporated into the boride layers forming either (FeCr)B or (FeCr) 2 B, and it promotes FeB layer formation. [22][23][24] The thickness and superficial microhardness (beneath 10 μm from the surface) of boride layers on the borided AISI 52100, 5140, 440C, 420 and 304 steels at 850 and 950°C for holding time of 4 h are given in Table 2.…”

Section: Journal Of Adhesion Science and Technology 2069mentioning

confidence: 99%

Characterization and Rockwell-C adhesion properties of chromium-based borided steels

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2015

Journal of Adhesion Science and Technology

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In this study, adhesion properties of boride layers formed on the surface of AISI 52100, AISI 5140, AISI 440C, AISI 420 and AISI 304 steels were investigated. Boronizing treatment was carried out in Ekabor-II powders at the temperatures of 850 and 950°C for 4 h. The properties of boride layers were evaluated by optical microscopy, SEM, X-ray diffraction and micro-Vickers hardness tester. The Daimler-Benz Rockwell-C adhesion test was used to assess the adhesion of boride layers. Test result showed that adhesion of boride layers depended on the dual-phase structure. The stresses at the FeB/Fe 2 B interphase caused delamination failure and poor interphase adhesion with increase in the depth of hard and brittle FeB-based layer.

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