Tensile and fracture behavior of boron and carbon modified Ti-15-3 alloys in aged conditions

This work illustrates the effect of boron and carbon addition on the mechanical behavior of a beta Ti alloy, Ti–15V–3Cr–3Al–3Sn (Ti-15-3), in differently aged conditions. The alloys were prepared by consumable vacuum arc melting followed by forging and hot rolling. These were subsequently solution t...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2016-02, Vol.656, p.223-233
Main Authors: Sarkar, R., Ghosal, P., Nandy, T.K., Ray, K.K.
Format: Article
Language:English
Subjects:
Alloys
Beta Ti alloy
Boride
Carbide
Carbon
Correlation
Fracture
Fracture mechanics
Fracture toughness
Mechanical properties
Microstructure
Tensile
Titanium base alloys
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This work illustrates the effect of boron and carbon addition on the mechanical behavior of a beta Ti alloy, Ti–15V–3Cr–3Al–3Sn (Ti-15-3), in differently aged conditions. The alloys were prepared by consumable vacuum arc melting followed by forging and hot rolling. These were subsequently solution treated and aged at different temperatures above 500°C for 8h. Standard tensile and plane strain fracture toughness tests were carried out to understand the mechanical behavior of the alloys and its correlation with the microstructural features characterized by scanning and transmission electron microscopy. Both the boron- and the carbon-containing alloys exhibit improved strength with comparable elongation to failure values as compared to the base Ti-15-3 alloy. The presence of TiB and TiC precipitates in a matrix of fine α with β results in lower fracture toughness (KIC) in the boron- and carbon-containing alloys as compared to the base alloy. However, at higher aging temperatures KIC improves due to more tortuous crack path because of the presence of coarse α-phase. An empirical relationship has been proposed correlating KIC with the volume fraction, size and interspacing of α in these alloys.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2016.01.038