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

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

Materials Development Division

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

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.

Original language	English
Title of host publication	Materials Integration
Publisher	Trans Tech Publications Ltd
Pages	161-165
Number of pages	5
ISBN (Print)	9783037853764
DOIs	https://doi.org/10.4028/www.scientific.net/KEM.508.161
Publication status	Published - 2012
Event	Int. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011 - Sendai, Japan Duration: 2011 Dec 1 → 2011 Dec 2

Publication series

Name	Key Engineering Materials
Volume	508
ISSN (Print)	1013-9826
ISSN (Electronic)	1662-9795

Other

Other	Int. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011
Country/Territory	Japan
City	Sendai
Period	11/12/1 → 11/12/2

Keywords

Fatigue
Forging
Primary α
Rolling
Secondary α
Ti-6Al-4V
Titanium alloy

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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10.4028/www.scientific.net/KEM.508.161

Cite this

Lee, YS, Niinomi, M, Nakai, M, Hieda, J, Maeda, T, Shirai, Y & Inagaki, I 2012, Difference of microstructure and fatigue properties between forged and rolled Ti-6Al-4V. in Materials Integration. Key Engineering Materials, vol. 508, Trans Tech Publications Ltd, pp. 161-165, Int. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011, Sendai, Japan, 11/12/1. https://doi.org/10.4028/www.scientific.net/KEM.508.161

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title = "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.",

keywords = "Fatigue, Forging, Primary α, Rolling, Secondary α, Ti-6Al-4V, Titanium alloy",

author = "Lee, {Yoon Seok} and Mitsuo Niinomi and Masaaki Nakai and Junko Hieda and Takashi Maeda and Yoshihisa Shirai and Ikuhiro Inagaki",

note = "Copyright: Copyright 2020 Elsevier B.V., All rights reserved.; Int. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011 ; Conference date: 01-12-2011 Through 02-12-2011",

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doi = "10.4028/www.scientific.net/KEM.508.161",

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AU - Lee, Yoon Seok

AU - Niinomi, Mitsuo

AU - Nakai, Masaaki

AU - Hieda, Junko

AU - Maeda, Takashi

AU - Shirai, Yoshihisa

AU - Inagaki, Ikuhiro

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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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KW - Primary α

KW - Rolling

KW - Secondary α

KW - Ti-6Al-4V

KW - Titanium alloy

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ER -

Difference of microstructure and fatigue properties between forged and rolled Ti-6Al-4V

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