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S. Krishnamohan ¹, S. Ramanathan ², S. Velmurugan ¹

Affiliations
1 Department of Mechanical Engineering, E.G.S Pillay Engineering College, Nagapattinam, Tamilnadu, 611 002, IN
2 Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, Tamilnadu, 608 002, IN

Abstract

Nanocomposites are composites that consist of nanosized particles embedded in some type of matrix are a group of promising new materials that will undoubtedly become infused with some of our modern technologies. Material property combinations and ranges have been, and are yet being, extended by the development of composite materials. Already Titanium is recognized for its strategic importance as a unique lightweight, high strength alloyed structurally efficient metal for critical, high-performance aircraft, such as jet engine and airframe components. Due to its high strength-to-weight ratio, Titanium is called as the "space age metal". Today, titanium alloys are common, readily available engineered metals that compete directly with stainless and Specialty steels, copper alloys, nickel based alloys and composites. In order to reduce residual stress developed during fabrication and to increase the strength a new composite material of Titanium (Ti-6Al-4V) Alloy with Nano SiC are needed. This composite also is an alpha beta alloy which is subjected to annealing and solution treatment to attain beta phase. This beta phase is maintained by quenching and subsequent aging to increase strength. Thermal cycling process was carried out for heat treated composite specimen. This paper reports on the investigation of tensile behaviour of different Heat treated and thermal cycled composite material of Titanium (Ti-6Al-4V) Alloy with Nano SiC and the micro structural changes. Also the tensile behaviour is compared with the ordinary Titanium Alloy.

Keywords

Stir Casting, Thermal Cycling, Heat Treatment, Solutionizing, Aging, Tensile Strength.

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S. Manikandan ¹, S. Ramanathan ², S. Krishnamohan ³, D. Vasudevan ¹

Affiliations
1 Department of Mechanical Engineering, Annamalai University, Annamalai Nagar-608002, Tamilnadu, IN
2 Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar-608002, Tamilnadu, IN
3 Department of Mechanical Engineering, E.G.S Pillay Engineering College, Nagapattinam-611002, Tamilnadu, IN

Abstract

Titanium is recognized for its strategic importance as a unique lightweight, high strength alloyed structurally efficient metal for critical, high-performance aircraft, such as jet engine and airframe components. Titanium is called as the "space age metal" and is recognized for its high strength-to-weight ratio. Today, titanium alloys are common, readily available engineered metals that compete directly with stainless and Specialty steels, copper alloys, nickel based alloys and composites. Titanium alloys are needed to be heat treated in order to reduce residual stress developed during fabrication and to increase the strength. Titanium (Ti-6Al-4V) alloy is an alpha beta alloy which is subjected to annealing and solution treatment to attain beta phase. This beta phase is maintained by quenching and subsequent aging to increase strength. Thermal cycling process was carried out for heat treated Ti-6Al-4V specimens. Forced air used for cooling. This paper reports on the investigation of tensile behaviour of different Heat treated and thermal cycled Titanium (Ti-6Al-4V) alloy and the micro structural changes.

Keywords

Thermal Cycling, Heat Treatment, Solutionizing, Aging, Tensile Strength.

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S. Krishnamohan ¹, J. Jeevamalar ¹

Affiliations
1 Department of Mechanical Engineering, E.G.S. Pillay Engineering College, Nagapattinam-611002, IN

Abstract

Friction stir welding (FSW) is a novel solid-state joining process that was invented in 1991, it can avoid many problems associated with fusion welding processes, thereby defect-free welds having excellent properties can be produced even in some materials with poor fusion weldability. The present investigation is aimed at to study the influence of FSW process parameters such rotational speed, welding speed and shoulder diameter on sensitization of AISI 409M grade ferritic stainless steel joint. FSW experiments were conducted based on three factors, three-level, and central composite small design. Specimens were extracted from each joint. Modified strauss test and double loop electrochemical potentiokinetic reactivation (DL-EPR) test using an electrolyte of 0.1M H2SO4, 0.4M Na2SO4 and 0.5 ppm KSCN with a PH value of 1.8 at room temperature and at a potential scan rate dE/dt of about 2.5 mV/s, was chosen to evaluate the sensitization of frictions stir welded ferritic stainless steel joints. Activation to reactivation current ratio (Ia/Ir) and corrosion rate were evaluated for each condition and empirical relationships were developed between the process parameters and corrosion rate. The effect of FSW process parameters on sensitization of friction stir welded AISI 409M ferritic stainless steel joints.

Keywords

Electro Potentiokinetic Reactivation, Friction Stir Welding, Sensitation, Surface Methodology.

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