engleski

Determination of mechanical properties of niobium micro-Alloyed steel using instrumented indentation test

Niobium Nb micro-alloyed steels belong to a group of structural steels. They are alloyed with a small content of Nb (0.02-0.1 wt.%) which has a significant influence on many properties. Nb exhibits a strong affinity for nitrogen N and carbon C and causes the formation of niobium carbide NbC, niobium nitride NbN and niobium carbonitride Nb(C, N) in a structure which prevents grain growth and slows the recrystallization process and thus contributes to precipitation hardening. The mechanical properties of Nb micro-alloyed steel with Nb content of 0.035 wt.% were researched using instrumented indentation test. The indentation was carried out using different loads to determine the effect of the applied load on the measured properties and to research the applicability of the method for this group of materials. Based on the slope of the force-penetration depth curve during the loading and unloading, the Martens hardness, indentation hardness, indentation modulus, Vickers hardness, elastic/plastic work and creep characteristic were determined.

Nb micro-alloyed steel, instrumented indentation test, mechanical properties

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