NFPによるTi-6Al-4V合金のα粒微細化技術

概要

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Daido Steel has performed fine grain control technology on the primary α of Ti-6Al-4V alloy, using GFM forging machine (NFP). As for the effect of microstructure on the mechanical properties of Ti-6Al-4V alloy, fatigue strength has been effected not only by the primary α grain size but also by the α volume fraction. As for the relation between fatigue limit ratio (fatigue limit/tensile strength) and α volume fraction, as the α volume fraction decreased, fatigue limit ratio improved. However, the α volume fraction was astringent when it became approximately 35%. As for the effect of α grain size on the fatigue limit, we recognized that the fatigue limit and 1/√d (d=α grain size) are linear. When the α grain size became finer that 10μm with approximately 35% α volume fraction, the fatigue limit was more than 45kgf/mm2.
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