Super 304HCu austenitic stainless steel containing 2.3–3 (wt.%) of Cu is mainly used in superheaters and reheaters tubing ultra super critical boilers which operates over 600 °C steam temperature. Tensile tests were carried out on 304HCu, using nominal strain rate 1 × 10−3 s−1, at room temperature, 550 °C, 650 °C. The tensile strength elongation found to decrease with increase test stress curves fitted Hollomon equation determine the hardening exponent value. Differential Crussard–Jaoul...

Friction stir welding (FSW) was employed to join 10 mm thick AA2024-T6 aluminium alloy plates overcome the fusion related problems such as grain coarsening in zone, heat affected zone (HAZ) softening, lower joint efficiency and premature failure. The center cracked test (CCT) specimens were used evaluate fatigue crack growth rate of welded joints. microstructural features characterized using optical microscopy (OM), scanning electron (SEM) transmission (TEM). fractured surfaces CCT analyzed...

Abstract The high-strength aluminum alloy is the potential candidate to replace conventional materials. It has excellent corrosion-resistant, recyclable machinability. joining of such a type using fusion welding very difficult. Solid-state welding, friction stir (FSW) been used. However, this process attained maximum joint 90% base material strength. drop remaining strength due formation temperate region in thermo-mechanically affected area. Most researchers have reported that failure...

Super 304H austenitic stainless steel with 3% of copper posses excellent creep strength and corrosion resistance, which is mainly used in heat exchanger tubing the boiler. Heat exchangers are nuclear power plants marine vehicles intended to operate chloride rich offshore environment. Chloride stress cracking most likely life limiting failure tubing. Welding may worsen susceptibility material. Stress parent metal gas tungsten arc (GTA) welded joints were studied by constant load tests 45%...

Abstract The demand for lightweight materials (aluminium and magnesium alloy) in structural applications is increasing due to strength ratio, corrosion resistance, formability, recyclability. Fusion welding of aluminium its alloy difficult the formation hot cracking, segregation, porosity, etc. Henceforth, fusion not an ideal process joining alloy. Steel rivets are being used join similar dissimilar alloys different joint configurations. Since use steel rivets, aircraft weight has increased...

Hot tensile test data of Gas Tungsten Arc Welded (GTAW) autogenous joints Super 304HCu tubes tested at their operating temperature are presented along with the microstructure weld joint. The GTAW exhibited lower strength than parent metal and failure occurred in region for all temperatures. Constant load Stress Corrosion Cracking (SCC) boiling MgCl2 environment different applied stress level presented. SCC curves obtained from were analyzed to derive parameters such as rate steady state...

Super 304H austenitic stainless steel tubes containing 2.3 to 3 (wt.%) of Cu are mainly used in superheaters and reheaters ultra super critical boilers due their excellent corrosion oxidation resistance. addition causes precipitation strengthening effect by fine Cu-rich precipitates which evolve during creep conditions results increased strength. The microstructural evolution steels welding significantly affects the material properties. In this work, solidification mode microstructure hot...

The present investigation aims at optimizing the biodiesel production of Grape seed bio-oil. Modelling proficiencies like Adaptive Neuro Fuzzy Interference System, Artificial Neural Network and Response Surface Methodology (RSM) approaches are used to assess optimal yield by considering input variable parameters molar ratio, reaction time catalyst concentration. Two-stage transesterification process is deployed using sodium hydroxide methanol. RSM predicted optimized grape was noticed as...

<div class="section abstract"><div class="htmlview paragraph">One of the most common materials in fabrication sectors, especially auto sector, is Aluminum alloy. Owing to its low strength weight ratio, it could be a good fit for number applications. The cold working procedure may strengthen 5XXX series alloy, which not heat treatable and also challenging fuse these alloys together using fusion welding processes. In Recent days, solid-state procedure, Friction Stir Welding (FSW)...

Renewable energy is a sure bet for needs in the future and algae biofuels instance can go long way to provide needed. In this work, process of obtaining bio-oil from Dunaliella salina, hypersaline, unicellular microalga, having greenish-orange colour, described. The microalgae were cultured f/2 nutrition medium supplemented with carbon dioxide vitamins trace metals. 650 mL obtained, where ultrasonic extraction frequencies 60 Hz was carried out on sample period 90 minutes isolate bio-oil....

The SUS 304HCu austenitic stainless steel is used in superheater / reheater of ultra super critical boilers for their high temperature oxidation and corrosion resistance. Cu addition to steels can have adverse effects on the mechanical properties during fusion welding as it form low eutectic phases that preferentially segregate grain boundaries embrittle alloy. Friction a solid state process where bonding takes place well below melting alloy, combined with autogenous nature this minimizes...

AISI 304HCu austenitic stainless steel containing 2.3 to 3 (% wt) of Cu is mainly used in superheaters and reheater ultra super critical (USC) boilers which operates over 600°C steam temperature. Austenitic steels welded by gas tungsten arc welding (GTAW) alters the phase composition, microstructure fusion zone welds may affect mechanical properties. In our previous investigation, it found that autogenous tubes resulted segregation alloying elements weld metal joints with inferior tensile...