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Balasubramanian T.S.,Combat Vehicle Research and Development Establishment CVRDE | Balasubramanian V.,Annamalai University | Muthu Manickam M.A.,Combat Vehicle Research and Development Establishment CVRDE
Materials and Design | Year: 2011

The present investigation is aimed to evaluate fatigue crack growth parameters of gas tungsten arc, electron beam and laser beam welded Ti-6Al-4V titanium alloy for assessing the remaining service lives of existing structure by fracture mechanics approach. Center cracked tensile specimens were tested using a 100. kN servo hydraulic controlled fatigue testing machine under constant amplitude uniaxial tensile load. Crack growth curves were plotted and crack growth parameters (exponent and intercept) were evaluated. Fatigue crack growth behavior of welds was correlated with mechanical properties and microstructural characteristics of welds. Of the three joints, the joint fabricated by laser beam welding exhibited higher fatigue crack growth resistance due to the presence of fine lamellar microstructure in the weld metal. © 2011 Elsevier Ltd. Source


Balasubramanian T.S.,Combat Vehicle Research and Development Establishment CVRDE | Balasubramanian V.,Annamalai University | Muthumanikkam M.A.,Combat Vehicle Research and Development Establishment CVRDE
World Academy of Science, Engineering and Technology | Year: 2011

This paper reports the fatigue crack growth behaviour of gas tungsten arc, electron beam and laser beam welded Ti-6Al-4V titanium alloy. Centre cracked tensile specimens were prepared to evaluate the fatigue crack growth behaviour. A 100kN servo hydraulic controlled fatigue testing machine was used under constant amplitude uniaxial tensile load (stress ratio of 0.1 and frequency of 10 Hz). Crack growth curves were plotted and crack growth parameters (exponent and intercept) were evaluated. Critical and threshold stress intensity factor ranges were also evaluated. Fatigue crack growth behaviour of welds was correlated with mechanical properties and microstructural characteristics of welds. Of the three joints, the joint fabricated by laser beam welding exhibited higher fatigue crack growth resistance due to the presence of fine lamellar microstructure in the weld metal. Source


Balasubramanian T.S.,Combat Vehicle Research and Development Establishment CVRDE | Balasubramanian V.,Annamalai University | Muthumanikkam M.A.,Combat Vehicle Research and Development Establishment CVRDE
Journal of Materials Engineering and Performance | Year: 2011

Titanium alloys have been successfully applied for aerospace, ship, and chemical industries because they possess many good characteristics such as high strength to weight ratio, superior corrosion resistance, and excellent high temperature resistance. Though these alloys show reasonable weldability characteristics, the joint properties are greatly influenced by the welding processes. The evaluation and prediction of fatigue life are very important for the welded joints to avoid catastrophic failure particularly in titanium alloys. This article compares the fatigue performance of Ti-6Al-4V alloy fabricated by gas tungsten arc welding, laser beam welding, and electron beam welding processes. The resultant fatigue properties of the welded joints are correlated with the tensile properties and microstructural characteristics. Of the three processes considered the joint welded by laser beam welding exhibits higher fatigue limit when compared with the other two processes due to the presence of fine lamellar microstructure in the weld metal region. © 2011 ASM International. Source


Balasubramanian T.S.,Combat Vehicle Research and Development Establishment CVRDE | Balakrishnan M.,Annamalai University | Balasubramanian V.,Annamalai University | Muthu Manickam M.A.,Combat Vehicle Research and Development Establishment CVRDE
Science and Technology of Welding and Joining | Year: 2011

Although Ti-6Al-4V alloys show reasonable weldability characteristics, the joint properties are greatly influenced by the welding processes. Microstructures and tensile and impact properties of welded Ti-6Al-4V alloy were evaluated for high vacuum electron beam welding, CO2 laser beam welding and gas tungsten arc welding. The resultant tensile and impact properties of the welded joints are correlated with the weld metal microstructure and hardness. The results indicate that the electron beam welding is more suitable for Ti-6Al-4V sheet welding and the welding seam without defects can be obtained. The full penetration butt welds are obtained by gas tungsten arc welding process, but they have many drawbacks such as wide weld seam, big deformation and coarse grains. Laser beam welding has many advantages such as the narrowest weld seam, the least deformation and the finest grains, but it should be studied again for the reasons of unstable welding technologies and strict condition, © 2011 Institute of Materials, Minerals and Mining. Source


Balasubramanian T.S.,Combat Vehicle Research and Development Establishment CVRDE | Balasubramanian V.,Center for Materials Joining and Research | Muthumanikkam M.A.,Combat Vehicle Research and Development Establishment CVRDE
World Academy of Science, Engineering and Technology | Year: 2011

This paper reports the fatigue crack growth behaviour of gas tungsten arc, electron beam and laser beam welded Ti-6Al-4V titanium alloy. Centre cracked tensile specimens were prepared to evaluate the fatigue crack growth behaviour. A 100kN servo hydraulic controlled fatigue testing machine was used under constant amplitude uniaxial tensile load (stress ratio of 0.1 and frequency of 10 Hz). Crack growth curves were plotted and crack growth parameters (exponent and intercept) were evaluated. Critical and threshold stress intensity factor ranges were also evaluated. Fatigue crack growth behaviour of welds was correlated with mechanical properties and microstructural characteristics of welds. Of the three joints, the joint fabricated by laser beam welding exhibited higher fatigue crack growth resistance due to the presence of fine lamellar microstructure in the weld metal. Source

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