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Article: Effect of Yttrium on the Fatigue Behavior of Investment-Cast and Wrought Ti-6Al-4V
- Article from:
- Metallurgical and Materials Transactions
- Article date:
- November 1, 2009
- Author:
CopyrightCopyright Minerals, Metals & Materials Society Nov 2009. Provided by ProQuest LLC. (Hide copyright information)
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The effect of yttrium (Y)-containing particles on the microstructure and fatigue behavior of investment-cast and hot isostatically pressed (HIP) Ti-6Al-4V has been investigated. Elemental Y was added to the Ti-6Al-4V melt to obtain a concentration of 200 ppm Y. which is 4 times the amount allowed by current industrial specifications. The observed particles were between 100 nm and I µm in diameter, were widely dispersed, and did not agglomerate. High-cycle fatigue tests were conducted and an extensive fractography study revealed that the effect of the particles was negligible compared to the large colony size, and therefore slip length, in the cast material. The fatigue lives were ...