Abstract
Plasma treatment, owing to high concentrated rapid heating, ensures microstructure dispersion and creates the possibility of the formation of meta-stable phase-structural austenite modifications in carbonized surface layers of metal parts. The objective of the work is to investigate opportunities for strengthening and improving wear resistance of structural carbonized steel by modifying the amount and meta-stability of austenite, by means of plasma treatment.
Metallographic and X-ray research was used, as well as measurements of hardness and micro-hardness toughness. Wear resistance was tested at dry friction of metal sliding against metal.
Following plasma treatment with micro-fusion (Т≈1500°С), there happens to be an increase in wear resistance of 18ХГТ steel, when fine-crystalline martensite dispersed with carbonized particles is observed at a small amount of residual austenite (20-25%).
An effect of self-strengthening at the process of testing was reached due to the realization of Deformation Induced Martensity γret.→α' Transformation at wear (DIMTW).
Keywords
Carbonization, plasma, micro-fusion, treatment, residual austenite, meta-stability, transformation, martensite, wear resistance.
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