The inclusions size in context fatigue properties of plasma nitriding steel was studied. The size of inclusion, such as geometry and location, has remarkable influence to fatigue properties of steel 41CrAlMo7-10. The samples were shaped by turning operations and subsequently grinded to prescribe values of a standard test bars. Next technological operation was heat-treatment, such as normalizing, quenching and tempering. Plasma nitriding technology as a diffusion technology used to formation of nitrided layers on surface of heat-treated steel. Plasma nitriding technology is effective method usage in practise especially due to increasing of surface hardness, corrosion resistance and fatigue strength. The samples were subjected to the fatigue bending rotation tests.Keywords: Plasma nitriding technology, fatigue test, inclusions
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