Metastable beta (β) titanium alloy welds typically exhibit low strength and hardness due to their coarse fusion zone (FZ) microstructure. Efforts to improve the mechanical properties of these alloys have been confined to the use of various heat treatment processes as the means to promote α precipitation in the β matrix. The present study employs a novel method of using boron-added commercial pure-Ti fillers in gas tungsten arc welding (GTAW) of the Ti-15V-3Cr-3Sn-3Al metastable β titanium alloy. Microstructural analysis of boron-added welds showed refined prior-β grains and equiaxed dendritic grains with nonlinear grain boundaries. The formation of TiB and consequent microstructural modification of the FZ in the welds prepared using 0.5 wt% boron-added CP-Ti filler contribute to the improvement in the mechanical properties. © 2018

Janaki Ram G D

Department of Metallurgical and Materials Engineering

Aluminum alloys

boron

Chromium alloys

Fillers

Gas metal arc welding

Gas welding

Grain boundaries

Grain refinement

Grain size and shape

Mechanical properties

microstructure

Precipitation (chemical)

Tin alloys

Titanium alloys

Welding

Welds

DENDRITIC GRAINS

Gas tungsten arc welding

HEAT TREATMENT PROCESS

METASTABLE BETA-TITANIUM ALLOYS

Microstructural analysis

MICROSTRUCTURAL MODIFICATION

TI-15-3

TI-15V-3CR-3SN-3AL

Phosphorus compounds

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Journal of Alloys and Compounds

Environmentally induced degradation is a serious issue governing the use of titanium alloy fasteners for marine applications. The workhorse alloy Ti6Al4V which has been the most used titanium alloy till date as fastener material has its limitations and search has been on for improved titanium-based materials. This paper deals with researches aimed at evaluating the metastable beta titanium alloy Ti15V3Cr3Al3Sn (Ti15-3) in solution annealed condition as a fastener material for medium strength applications. A variety of tests was carried out to rate the resistance of the alloy in this condition to seawater environments slow strain rate testing (SSRT), crevice corrosion testing, potentiodynamic polarization studies, and immersion testing. Limited SSRT was also done on Ti6Al4V for the sake of comparison. Analysis of test results shows that solution annealed Ti15-3 offers itself as a good candidate material for medium strength fastener applications in marine environments. © 2018

Degradation behavior of metastable β Ti-15-3 alloy for fastener applications

Strength and ductility of fusion zone of metastable β titanium alloy welds can be improved by choosing suitable fillers. This paper reports the effects of using CP-Ti filler on the microstructural and mechanical properties of Ti-15-3 weldments. Full penetration autogenous and CP-Ti filler welds were produced by pulsed gas tungsten arc welding. X-ray diffraction analysis revealed small amounts of α-Ti phase in the diffraction pattern obtained for welds prepared using CP-Ti filler. Transmission electron microscopy analysis showed presence of grain boundary and intragranular α in the fusion zone of the welds prepared using CP-Ti filler. The welds prepared with CP-Ti filler showed higher hardness, higher UTS and lower % strain compared to autogenous welds. © 2017, The Indian Institute of Metals - IIM.

Transactions of the Indian Institute of Metals

Microstructure and Mechanical Properties of Ti-15-3 Alloy Gas Tungsten Arc Welds Prepared Using CP-Titanium Filler

Microstructure and mechanical properties of gas-tungsten-arc (GTA)-welded Ti-15V-3Cr-3Sn- 3Al alloy in direct current electrode negative mode are characterized. The thermal profile was measured during welding with continuous current (CC) and pulsed current (PC) at different frequencies. A single-step postweld aging of the welded samples at subtransus temperature was attempted to study precipitation of alpha phase. Two different morphologies of alpha phase are observed along with a partitioning of alloying elements into the two phases. Processing conditions for higher strength are identified and correlated with the thermal profile. Microstructure changes due to postweld heat treatment were characterized. © The Minerals, Metals &amp; Materials Society and ASM International 2009.

Fulltext

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Microstructure and mechanical properties of gas-tungsten-arc-welded Ti-15-3 beta titanium alloy

Terotechnology

Evolution of Microstructure in the Heat Affected Zone of S960MC GMAW Weld

Materials Science and Engineering: A

Effects of trace TiB and TiC on microstructure and tensile properties of β titanium alloy

Acta Materialia

Perspectives on Titanium Science and Technology

Grain refinement of Ti-15V-3Cr-3Sn-3Al metastable β titanium alloy welds using boron-modified fillers

Journal	Data powered by TypesetJournal of Alloys and Compounds
Publisher	Data powered by TypesetElsevier Ltd
ISSN	09258388
Open Access	No