Phase-structure formation and features of the behavior of iron–high-carbon ferrochrome–nickel boride powder materials under abrasive wear conditions
https://doi.org/10.17073/1997-308X-2020-55-64
Abstract
The study covers the effect of nickel boride (Ni3B) additives on phase-structure formation, physical and mechanical properties and resistance of iron – high-carbon ferrochrome powder (35 wt.%) to abrasive wear. It was found that Ni3B additives provide the formation of a multiphase, microheterogeneous structure of a matrix-filled material consisting of chromium steel and solid inclusions of complex chromium-iron carbides such as Ме3С, Me7C3 and Me23C6 and borides FeB, Fe2B that significantly increase the microhardness of solid phases from 8.34 to 11.65 GPa. It was also revealed that the increase in the content of a doping additive from 3.5 to 8.7 wt.% increases base material resistance to abrasion wear from 6.9 to 12.2 km/mm and decreases hardness from 75 to 68 HRA and bending strength from 1560 to 844 MPa. The method of optical profilometry was used to study the topographical features of worn surface morphology to estimate the depth and local development of wear on sample surfaces with standardized roughness parameters calculated based on 2D or 3D profiles. Average roughness parameters for each composition were found to be Ra = 0.44÷0.6, Rz = 0.49÷1.2 μm, and Rp = 0.26÷0.56 μm for materials doped with Ni3B, and Ra = 1.860 μm, Rz = 0.813 μm, Rp = 3.356 μm for the base material. It was shown that the promising compositions that combine acceptable physical and mechanical properties and improved abrasive wear resistance are materials based on the Fe–35%FeН800 system containing 5.2–6.9 wt.% of Ni3B.
About the Authors
E. S. Karaimchuk
Frantsevich Institute for Problems in Materials Science, NASU
Ukraine
Ukraine
junior researcher of Department № 36
03680, Kyiv, Krzhizhanovsky str., 3
V. A. Maslyuk
Frantsevich Institute for Problems in Materials Science, NASU
Ukraine
Ukraine
Dr. Sci. (Tech.), prof., leading officer of Department № 36
03680, Kyiv, Krzhizhanovsky str., 3
A. A. Mamonova
Frantsevich Institute for Problems in Materials Science, NASU
Ukraine
Ukraine
Cand. Sci. (Tech.), senior researcher of Department № 36
03680, Kyiv, Krzhizhanovsky str., 3
S. A. Umerova
Frantsevich Institute for Problems in Materials Science, NASU
Ukraine
Ukraine
Cand. Sci. (Tech.), researcher of Department № 48
03680, Kyiv, Krzhizhanovsky str., 3
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Review
For citations:
Karaimchuk E.S., Maslyuk V.A., Mamonova A.A., Umerova S.A. Phase-structure formation and features of the behavior of iron–high-carbon ferrochrome–nickel boride powder materials under abrasive wear conditions. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2020;(1):55-64. (In Russ.) https://doi.org/10.17073/1997-308X-2020-55-64
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