Thermal stability of nanostructured iron powder as a function of amount and nature of reinforcement (Nb or NbC)
DOI:
https://doi.org/10.3989/revmetalm.1055Keywords:
Niobium, Mechanical alloying, Microalloyed sintered steels, Thermal stability, Nanostructured powder, Ferritic grain growthAbstract
In structural steels, an effective strategy to succeed in increasing both strength and toughness is the grain refining, like in microalloyed steels. To delay or even inhibit the grain growth there are two basic mechanisms: particle pinning and solute drag. The effect of the presence of small particles of NbC to inhibit the austenitic grain growth is well known. However, it is not so clear which mechanism will be more effective to delay ferritic grain growth. In order to confirm it, nanostructured iron powders reinforced with Nb and NbC have been prepared by mechanical alloying. The main objective of this work is, therefore, to study the thermal stability of the nanostructured powder as a function of the reinforce type (elemental Nb or NbC) and its content.
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