EFFECT OF FINE PARTICLE PEENING USING HYDROXYAPATITE SHOT PARTICLES AND PLASMA SPRAYED HYDROXYAPATITE COATING ON FATIGUE PROPERTIES OF BETA TITANIUM ALLOY

Fine particle peening (FPP) and plasma spraying using hydroxyapatite particles were applied to a beta titanium alloy, Ti-22V-4Al, to form the hydroxyapatite (HAp) layer on the surface. As a result, HAp layer was formed on the specimen surface by the both treatments. The thicknesses were 5 µm and 100...

Full description

Saved in:
Bibliographic Details
Published inWIT Transactions on Engineering Sciences Vol. 116; p. 205
Main Authors Nakamura, Yuki, AOKI, TAPPEI, Shimizu, Toshihiro, Kikuchi, Shoichi, Nambu, Koichiro, Akahori, Toshikazu
Format Journal Article
LanguageEnglish
Published Southampton W I T Press 2017
Subjects
Bending fatigue
Beta rays
Biocompatibility
Blasting
Compressive properties
Crack initiation
Diamond pyramid hardness
Fatigue strength
Fatigue tests
Fracture mechanics
Fracture surfaces
Hydroxyapatite
Peening
Plasma
Plasma spraying
Protective coatings
Residual stress
Roll bending
Substrates
Surgical implants
Titanium alloys
Titanium base alloys
Online AccessGet full text

Cover

More Information
Summary:Fine particle peening (FPP) and plasma spraying using hydroxyapatite particles were applied to a beta titanium alloy, Ti-22V-4Al, to form the hydroxyapatite (HAp) layer on the surface. As a result, HAp layer was formed on the specimen surface by the both treatments. The thicknesses were 5 µm and 100 µm, respectively for FPP treated and plasma sprayed specimens. In the FPP treated specimen, Vickers hardness was increased by FPP compared with that of the untreated specimens, resulting in work-hardening. Rotary bending fatigue tests were carried out on both treated and untreated specimens. The FPP treated specimens exhibited higher fatigue strength than the untreated specimens. It is due to the increase in hardness and compressive residual stress by FPP. On the other hand, significant deteriorations of the fatigue strength for the plasma sprayed specimen was observed in comparison with the result for the untreated specimen. As a result of fracture surface observation in plasma sprayed specimen, the defect formed by blasting before the plasma spraying at interface between substrate and HAp layer was observed at crack initiation site. Thus, the defect plays a role as the crack starter in the case of plasma sprayed specimen.
Bibliography:SourceType-Other Sources-1
ObjectType-Article-1
content type line 63
ObjectType-Feature-2
ISSN:1746-4471
1743-3533
DOI:10.2495/MC170211