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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 6/2011

01.06.2011

The Effect of Friction Stir Processing on the Mechanical Properties of Investment Cast and Hot Isostatically Pressed Ti-6Al-4V

verfasst von: A. L. Pilchak, J. C. Williams

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 6/2011

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Abstract

Friction-stir (FS) processing was used to modify the coarse, fully lamellar microstructure of investment cast and hot isostatically pressed (HIP’ed) Ti-6Al-4V. The effect of FS processing on mechanical properties was investigated using microtensile and four-point bend fatigue testing. The tensile results showed a typical microstructure dependence where yield strength and ultimate tensile strength both increased with decreasing slip length. Depending on the processing parameters, fatigue strength at 107 cycles was increased by 20 pct or 60 pct over that of the investment cast and HIP’ed base material. These improvements have been verified with a statistically significant number of tests. The results have been discussed in terms of the resistance of each microstructure fatigue crack initiation and small crack propagation. For comparison, a limited number of fatigue tests was performed on α + β forged Ti-6Al-4V with varying primary α volume fraction and also on investment cast material heat treated to produce a bi-lamellar condition.
Vorheriger Artikel Effect of Hydrogen on Tensile Properties of Ultrafine-Grained Type 310S Austenitic Stainless Steel Processed by High-Pressure Torsion
Nächster Artikel Wear Behavior and Mechanism of a Cr-Mo-V Cast Hot-Working Die Steel

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Metadaten
Titel
The Effect of Friction Stir Processing on the Mechanical Properties of Investment Cast and Hot Isostatically Pressed Ti-6Al-4V
verfasst von
A. L. Pilchak
J. C. Williams
Publikationsdatum
01.06.2011
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 6/2011
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-010-0547-1

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