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Content available Deformation-activated martensitic transformation in coatings obtained by hypersonic metallisation of high-chromium steel
Belotserkovsky Marat, Grigorchik Aleksandr, Kukareko Vladimir
Scientific Journal of Gdynia Maritime University
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2021
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nr 117
20--26
EN
he structural-phase state and wear resistance of coatings from high-chromium AISI 420 and A756 steels obtained by hypersonic metallisation (HM) were studied. It has been shown that coatings from martensitic steels after deposition contain an increased amount of metastable austenitic phase. In particular, 15 vol.% γ-faze is registered in a AISI 420 steel coating, and 70 vol.% γ-faze in a A756 steel coating. It has been established that during friction of hypersonic metallisation coatings of high-chromium steels, deformation-activated γ→α transformation in their surface layers leads to a significant increase in microhardness and the wear resistance of coatings.
2
Content available Heat treatment of hypersonic metallisation coatings from false alloys on the basis of alloy Ni80Cr20
Astrashab Evgenij, Grigorchik Aleksandr, Belotserkovsky Marat, Kukareko Vladimir
Scientific Journal of Gdynia Maritime University
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2020
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nr 116
7--14
EN
The structural-phase state and tribomechanical characteristics of hypersonic metallisation (HM) coatings from false alloys ‘Ni80Cr20 + Al99,3’ and ‘Ni80Cr20 + 08Mn2Si’ in the initial state and after annealing at 550° С and 650°С were investigated. It is shown that annealing of the coating from the false alloy ‘Ni80Cr20 + Al99,3’ leads to a significant increase in its microhardness and wear resistance. In particular, the microhardness of the coating increases ≈ 2 times, and the wear resistance ≈ 19 times in comparison with the initial state. Annealing of the coating from ‘Ni80Cr20 + 08Mn2Si’ leads to a decrease in its microhardness by 1.4 times, and wear resistance decreases by 3.0 times compared with the initial state.
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