NDLI: Effect of superplastic forming exposure on fatigue crack propagation behavior of Ti-6Al-4V alloy

Content Provider	Springer Nature Link
Author	Jeong, Daeho Kwon, Yongnam Goto, Masahiro Kim, Sangshik
Copyright Year	2016
Abstract	The effect of superplastic forming (SPF) exposure on the ε (strain)-N (number of cycles to failure) fatigue and fatigue crack propagation (FCP) behaviors of Ti-6Al-4V (Ti64) alloy was examined at 298 and 473 K. To simulate the thermal exposure during superplastic forming process, the mill-annealed Ti64 alloy sheet was heated in the vacuum chamber with the pre-determined temperature profile. Notable microstructural change during the SPF exposure included the shape of transformed β phase from fine and round particles in the as-received specimen to coarse angular particles in the as-exposed specimen. The effective grain size tended to increase with the exposure, enhancing the slip reversibility and the resistance to FCP. However, the crack hindering effect by fine, particle-like β phase became weak with the exposure, offseting the beneficial effect associated with the increment of effective grain size. The effect of SPF exposure on ε-N fatigue and FCP behavior of mill-annealed Ti64 alloy was therefore marginal, excluding the effect of α-case (the oxygen-enriched phase) on the surface.
Starting Page	747
Ending Page	754
Page Count	8
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	22
Issue Number	5
e-ISSN	20054149
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2016-08-19
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	fatigue crack propagation metal mechanical properties Ti-6Al-4V microstructure Metallic Materials Operating Procedures, Materials Treatment Magnetism, Magnetic Materials Engineering Thermodynamics, Heat and Mass Transfer Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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