Effects of boron, carbon, and silicon additions on microstructure and properties of a Ti-15Mobased beta titanium alloy

Citation
Lh. Chen et al., Effects of boron, carbon, and silicon additions on microstructure and properties of a Ti-15Mobased beta titanium alloy, MATER SCI T, 17(5), 2001, pp. 573-580
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
MATERIALS SCIENCE AND TECHNOLOGY
ISSN journal
0267-0836 → ACNP
Volume
17
Issue
5
Year of publication
2001
Pages
573 - 580
Database
ISI
SICI code
0267-0836(200105)17:5<573:EOBCAS>2.0.ZU;2-E
Abstract
Additions of boron, carbon, and silicon have been made to a series of Ti-15 Mo based beta titanium alloys prepared by plasma are melting and subjected to various processing and characterisation techniques. The purpose of these additions was to investigate their grain refining effect in the as cast, a s forged, and heat treated states. The boron and carbon additions promoted dendritic solidification. Boride and carbide particles were present in the interdendritic regions. However, a fully equiaxed fine grained structure co uld not be obtained even at the highest levels of addition (1.0 wt-%), Thes e additions resulted in substantial microstructural refinement after forgin g and the particles stimulated the nucleation of recrystallised grains. Sig nificant retardation of grain growth was observed after solution treatment and attributed to the Zener pinning effects of the boride and carbide parti cles. Despite the microstructural refinement, the ductility of the alloys c ontaining boron and carbon was severely impaired. (C) 2001 IoM Communicatio ns Ltd.