THE STRUCTURE AND PROPERTIES OF IRON ALLOYS WITH VARIOUS CHEMICAL COMPOSITIONS AFTER DIFFUSIONAL BORONIZING

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THE STRUCTURE AND PROPERTIES OF IRON ALLOYS WITH VARIOUS CHEMICAL COMPOSITIONS AFTER DIFFUSIONAL BORONIZING

Journal Title: Tribologia - Year 2017, Vol 275, Issue 5

Abstract

The purpose of the paper was to test how the content of carbon and alloying elements in steels influence the structure and properties of boronized layers. The following grades of steels were used during the tests: C45, C99U, 41Cr4, 42CrMo4, 45SG, 50HS, 60G, and 102Cr6. In the process of boronizing, the two-phase layer of borides of FeB and Fe2B were obtained on the tested steels with a hardness from 1900 HV0.1 for boride FeB to 1600 HV0.1 for Fe2B, irrespective of the chemical composition of the core/substrate. As the kontent of carbon and alloying elements in steels increase, the structure of borides becomes more compact, and the needles are thicker. The richer in alloying elements the core and the more carbon in steel, the thinner is the boride layer. After boronizing, the layer of FeB and Fe2B with a thickness of approx. 110 μm for C45 steel to approx. 90 μm for 102Cr6 steel was obtained. The test results indicate that the brittleness of borides increases in steels with the addition of Cr, and it decreases in steels containing Si and Mn. The highest wear resistance was obtained in steel 102Cr6.

Authors and Affiliations

Aleksandra PERTEK-OWSIANNA

Keywords

boronizing microstructure hardness fracture brittleness frictional wear resistance

EP ID EP236696
DOI 10.5604/01.3001.0010.5905
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