Effect of swaging on Young׳s modulus of ß Ti-33.6Nb-4Sn alloy.
J Mech Behav Biomed Mater
; 32: 310-320, 2014 Apr.
Article
em En
| MEDLINE
| ID: mdl-24378733
ABSTRACT
The effect of swaging on the Young's modulus of ß Ti-33.6Nb-4Sn rods was investigated by X-ray diffraction, thermography, microstructural observations, deformation simulator analysis and cyclic tensile deformation. Stress-induced αâ³ martensite was stabilized by swaging, dependent on the diameter reduction rate during swaging. Thermography and deformation simulator analysis revealed that swaged rods were adiabatically heated, and consequently, stress-induced αâ³ underwent reverse transformation. Young's modulus, which was measured by the slope of the initial portion of the stress-strain curve, decreased from 56GPa in the hot-forged/quenched rod to 44GPa in the rapidly swaged rod with a high reduction rate and to 45GPa in the gradually swaged rod with a low reduction rate. The tangent modulus, which was measured by the slope of the tangent to any point on the stress-strain curve, decreased with strain even in the linear range of the stress-strain curve of the hot-forged/quenched rod and the rapidly swaged rod, while the tangent modulus remained unchanged for the gradually swaged rod. It was found that Young's moduli in swaged ß Ti-33.6Nb-4Sn rods were affected by stabilized αâ³ martensite. Low Young's modulus of 45GPa and high strength over 800MPa were obtained when the reverse transformation by adiabatic heating was suppressed and the stress-induced αâ³ was sufficiently stabilized by gradual swaging to a 75% reduction in cross section area.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Estresse Mecânico
/
Teste de Materiais
/
Ligas
/
Módulo de Elasticidade
/
Temperatura Alta
Idioma:
En
Revista:
J Mech Behav Biomed Mater
Assunto da revista:
ENGENHARIA BIOMEDICA
Ano de publicação:
2014
Tipo de documento:
Article