Indira Gandhi Centre for Atomic Research (IGCAR) is one of India's premier nuclear research centres. It is the second largest establishment of the Department of Atomic Energy (DAE), next to Bhabha Atomic Research Centre (BARC), located at Kalpakkam, 80 km south of Chennai, India. It was established in 1971 as an exclusive centre dedicated to the pursuit of fast reactor science and technology, due to the vision of Dr. Vikram Sarabhai. Originally, it was called as Reactor Research Centre (RRC). It was renamed as Indira Gandhi Centre for Atomic Research (IGCAR) by the then Prime Minister of India, Rajiv Gandhi in December 1985. The centre is engaged in broad-based multidisciplinary programme of scientific research and advanced engineering directed towards the development of Fast Breeder Reactor technology, in India.
Single-step strain-annealing thermo-mechanical treatment (TMT) reliably produced grain-boundary-engineered (GBE) microstructures in 22-mm 316LN stainless steel. Cold-worked (5–20
Influence of test temperatures in the range 300-500 °C (including room temperature) on tensile properties and fracture toughness of SS 316 type austenitic stainless steel has been investigated. Decrease in yield strength, plateau in ultimate tensile strength and decrease in ductility was observed with test temperatures. Decrease in modulus of resilience and modulus of toughness was also observed. From true stress–true strain curves, strain hardening parameters and plastic strain energy density were determined. Plastic strain energy density was observed to follow trends similar to tensile properties. Fracture toughness ( J 1c ) and tearing resistance were determined from J –R cures. From J 1c , equivalent linear elastic fracture toughness ( K j1c ) values were determined. An attempt was made to predict linear elastic fracture toughness ( K 1c ) from tensile properties, based on a previously proposed methodology. Estimated K 1c are compared with experimentally determined fracture toughness ( K j1c ). Estimation of K 1c was also carried out for similar (SS 304 and SS 316) type of austenitic stainless steels and three other grades of steels. Based on estimated results, it is concluded that previous fracture toughness estimation scheme is applicable for austenitic stainless steels (SS 316 type and SS 304) and three other grades of steel.
We examine the structural, electrical, and electrochemical properties of Ag6Mo10-xWxO33 (0.0 <= x <= 1.0) mixed ionic-electronic conductors (MIEC), made through a straightforward solid-state method. Structural analysis shows a pure triclinic phase with decreasing lattice parameters as W increases up to x = 0.5. We observed improved silver ion conductivities 7.1 x 10-5 and 6.16 x 10-4 S cm- 1 for x = 0.25 and 0.5, respectively, with values much higher than those of undoped Ag6Mo10O33. Lower activation energies indicate easier ion movement in W-doped samples. Hebb-Wagner and AC impedance techniques confirm MIEC conduction. Electrochemical tests show that the x = 0.25 sample has the highest specific capacity (295 C g- 1). Charge storage mechanisms of the samples were elucidated with Dunn's analysis. An asymmetric supercapacitor (Ag6Mo9.75W0.25O33//AC) device performs excellently, delivering 168 C g- 1 at 5 mV s-1, with high energy density (49.67 Wh kg- 1) and 82.5% capacity retention after 10,000 cycles.
The thermo-physical properties of Fe1-xTix [x = 45, 50 & 55 at.% Ti] alloys were systematically investigated using X-ray diffraction (XRD), High-temperature X-ray diffraction (HTXRD), Differential Scanning Calorimetry (DSC), and Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS). Arc melting was used to synthesize the alloy samples. The homogeneity and composition of the homogenized alloy (1073 K/120 h) have been confirmed by SEM-EDS analysis. Rietveld refinement was used to determine the lattice parameters and relative phase fractions of the constituent phases. The average thermal expansion coefficients for the FeTi phase were found to be alpha ai = 1.109 x 10-5 K-1 (linear) and alpha v i = 3.324 x 10-5 K-1 (volumetric). The Cp of the singlephase FeTi intermetallic compound was measured employing heat flux DSC, utilizing conventional "three-step" procedures. Using an analytical framework based on the quasi-harmonic Debye-Gr & uuml;neisen model, a correlation between Cp and the enthalpy increment (HT - H298.15) was established across the temperature range 0-860 K. The model enables the deconvolution of the total heat capacity into vibrational, anharmonic, and electronic contributions, providing deeper insight into the thermal behavior of the FeTi intermetallic compound.
A 12-mm-thick AISI 316L(N) steel plate was welded using a hybrid technique that combines hot wire tungsten inert gas (HWTIG) and activated tungsten inert gas (A-TIG) processes. The microstructure and mechanical properties of the hybrid joint were systematically compared with those of multi-pass HWTIG and single-pass A-TIG welds. The hybrid weld metal contained 7
