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

Nageswara Rao M

Department of Manufacturing Engineering

School of Mechanical Engineering

Vellore Campus

Tiyyagura H.R

Kumari S

Mohan M.K

Pant B

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Journal of Alloys and Compounds

The microstructure and mechanical behavior of beta titanium alloy Ti-15V-3Cr-3Al-3Sn (Ti15-3) under unidirectional and high cycle fatigue (HCF) loading conditions were studied after single aging (SA) and duplex aging (DA). After SA, well-developed grain boundary α and micro precipitate free zones (micro PFZs) were present in the microstructure. Whereas after DA, grain boundary α was poorly developed and micro PFZs were absent. DA resulted in smaller size, higher density and volume fraction of alpha particles. DA led to higher work hardening rate, better strength-ductility combination and higher HCF life. Improved mechanical behavior after DA is explained based on microstructural observations. © 2014 Elsevier Ltd. All rights reserved.

International Journal of Fatigue

Effect of duplex aging on microstructure and mechanical behavior of beta titanium alloy Ti–15V–3Cr–3Al–3Sn under unidirectional and cyclic loading conditions

This paper presents the age hardening behavior of metastable beta titanium alloy Ti-15 V-3Cr-3Al-3Sn subjected to various single and duplex aging treatments. Single aging was carried out in the range 200-550 °C for times up to 150 h (h). For duplex aging first step was performed in two different ways: (i) 250 °C for 24 h (ii) 300 °C for 10 h; second step was carried in the range 350-500 °C, for times up to 150 h. The decomposition of alpha (α) phase during aging was monitored by hardness measurements, tensile testing, different microscopic techniques and X-ray diffraction. Duplex aging treatments resulted in higher hardness and strength compared to single aging. There was a good balance of tensile strength and ductility after two duplex aging treatments 300 °C/10 h + 500 °C/10 h and 250 °C/24 h + 500 °C/8 h. Precipitate free zones (PFZs) were observed when aged at ≤450 °C in the microstructure; aging at ≥500 °C gave freedom from such zones. Duplex aging resulted in a finer size and higher density of α precipitates compared to single aging. Duplex aging 250 °C/24 h + 500 °C/8 h led to a four to five fold improvement in high cycle fatigue (HCF) life compared to single aging at 500 °C/10 h. The observed improvement in HCF life could thus be related to smaller size and larger density of α precipitates resulting from duplex aging. Optical microscopy and X-ray diffraction studies clearly revealed that preaging for 10 h at 300 °C accelerated the α-phase precipitation reaction during aging. © 2014 Elsevier B.V. All rights reserved.

Studies on single and duplex aging of metastable beta titanium alloy Ti–15V–3Cr–3Al–3Sn

Materials & Design

ANN prediction of corrosion behaviour of uncoated and biopolymers coated cp-Titanium substrates

Microstructure and high temperature oxidation behavior of Ti-Al-Nb-Si coatings on Ti-6Al-4V alloy

Journal of Manufacturing Processes

Evolution of metallurgical properties of Ti-6Al-4V alloy fabricated in different energy densities in the Selective Laser Melting technique

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

Journal	Data powered by TypesetJournal of Alloys and Compounds
Publisher	Data powered by TypesetElsevier BV
ISSN	0925-8388
Open Access	0