Difference of Microstructure and Fatigue Properties between Forged and Rolled Ti-6Al-4V

Yoon Seok Lee; Mitsuo Niinomi; Masaaki Nakai; Junko Hieda; Takashi Maeda; Yoshihisa Shirai; Ikuhiro Inagaki

doi:10.4028/www.scientific.net/KEM.508.161

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 508Difference of Microstructure and Fatigue...

Difference of Microstructure and Fatigue Properties between Forged and Rolled Ti-6Al-4V

Abstract:

In the Present Study, the Effects of the Microstructural Morphologies of a Ti-6Al-4V (Ti-64) Alloy on its Fatigue Behavior Were Investigated. Ti-64 Bars Were Subjected to Two Different Thermo-Mechanical Processing Methods. The First Sample, Referred to as Material-A, Had a Forged Microstructure with the Average Primary α Volume Fraction of 44%. The Second One, Referred to as Material-B, Had a Hot-Rolled Microstructure with the Average Primary α Volume Fraction of 43%. Fatigue Tests Were Performed on each Sample to Obtain S-N Curves. The Microstructure of each Sample Was Observed Using an Optical Microscopy in Order to Measure the Grain Sizes of the Primary α and Secondary α Phases. The Results of the Fatigue Tests Indicated that Material-B Demonstrates Better Fatigue Strength than Material-A. The Microstructure of the Longitudinal Section of each Material Was Also Observed to Analyze the Results of the Fatigue Tests. The Measured Diameters and Volume Fractions of the Primary α Phases of the Two Types of Materials Are Similar. On the other Hand, the Secondary α Width of each Material Is Different. It Is Found that Fatigue Strength Is Related to the Width of the Secondary α Phase.

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Periodical:

Key Engineering Materials (Volume 508)

Pages:

161-165

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.508.161

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Online since:

March 2012

Authors:

Yoon Seok Lee, Mitsuo Niinomi, Masaaki Nakai, Junko Hieda, Takashi Maeda, Yoshihisa Shirai, Ikuhiro Inagaki

Keywords:

Rolling , Fatigue, Forging, Primary α, Secondary α, Ti6Al4V, Titanium Alloy

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