A Review Study of Submerged Arc welding Fluxes

Vol. 2 No.1

Year: 2013
 

Issue: November-January

Title: A Review Study of Submerged Arc welding Fluxes

Author Name: Ajay Kumar, Hari Singh , Sachin Maheshwaric

Synopsis:

In this paper, the work done by previous investigators for the development of new agglomerated flux used during submerged arc welding process is reviewed, and the gaps are identified. The new fluxes are developed by using CaO, SiO2 and Al2O3 basic elements and with the minor addition of MnO, CaF2, NiO, MgO and Fe-Cr are chosen as variables. The effect of variable flux constituents on weld metal are analyzed in the light of mechanical properties, bead morphology, element transfer analysis and physical properties by using response surface methodology technique. The results indicate that the newly developed flux behavior is at par of commercial fluxes.

Study of structure-properties (corrosion &mechanical) of TRIP-assisted steels by nondestructive testing

Vol. 2 No.1

Year: 2013

Issue: November-January

Title: Study of structure-properties (corrosion &mechanical) of TRIP-assisted steels by nondestructive testing

Author Name: ANIMESH TALAPATRA, N.R.Bandhyopadhyay , Jayati Datta 

Synopsis: 

In the present study, two TRIP-assisted steels were designated as A (having no Cr and Cu content) and B (having higher Ni, Cr and Cu content) heat treated under different conditions, and the correlation between its heatreatment, microstructure and properties were investigated.  Micro structural examination was carried out by optical microscope and scanning electron microscope after electrolytic etching. Non-destructive electrochemical and ultrasonic testing on two TRIP-assisted steels was used to find out corrosion and mechanical properties of different alter microstructure phase’s steels. Furthermore, micro structural studies accompanied by the evaluation of mechanical properties revealed that steels having martensite phases with higher corrosive and hardness value were less sound velocity and also steel’s microstructure having finer grains that was more grain boundary was less corrosion resistance. Steel containing more Cu, Ni and Cr was less corrosive compared to other steels having same processing or microstructure.

Optimization of Tool Travel Path in A Multiple Holes Cutting Process By Genetic Algorithm

Vol. 2 No. 1

Year: 2013

Issue: November-January

Title: Optimization of Tool Travel Path in A Multiple Holes Cutting Process By Genetic Algorithm

Author Name: Neeraj Sharma, R D Gupta, Nirmal Kumar

Synopsis:

To economize cutting process used in component manufacturing number of procedures are used. Typical parameters which are optimized are feed rate, spindle speed, depth of cut, machining time etc. Almost no consideration is given to non-productive machining time, which is an important parameter on modern computer numerical control machine tools. Its importance is further augmented in the area of numerically controlled cutting where surface area to thickness ratio is high. The problem is formulated as a large scale traveling salesman problem (TSP). The stochastic search procedure genetic algorithm is used to solve these instances of TSP. This solution allows the optimization of non-productive movement thus reducing the cycle time and increasing the productivity of the process.

On the introduction of return mapping schemes in elasto-plastic finite element simulations for isotropic and kinematic hardening

Volume No. 2

Year: 2013

Issue: Nov-Jan

Title: On the introduction of return mapping schemes in elasto-plastic finite element simulations for isotropic and kinematic hardening

Author Name: Moosa Esmaeili, Andreas ?chsner

Synopsis:

 

Elasto-plastic constitutive equations are integrated in the framework of nonlinear finite element techniques based on so-called predictor corrector schemes. An Introduction of material nonlinearities (elasto-plastic behaviour) applied in the framework of finite element analysis. The restriction to the one-dimensional case facilities significantly the mathematical notation while the steps remain the same as in the general three dimensional cases. In addition, the entire solution procedure can be easily observed in the classical stress-strain diagram. The concept of the predictor corrector scheme is presented for the case of isotropic, kinematic and combined hardening. Numerical examples illustrate the influence of different boundary conditions for different hardening laws.

Development and Microstructural Characterisation of Inconel Cladding on Stainless Steel through Microwave Irradiation

Volume No. 2

Year: 2013

Issue: Nov-Jan

Title: Development and Microstructural Characterisation of Inconel Cladding on Stainless Steel through Microwave Irradiation

Author Name: Sunny Zafar, A.K.Sharma , Navneet Arora

Synopsis:

Processing of ceramics through microwave is well established route, but processing metallic materials through microwave has been a challenge. The present paper reports cladding of austenitic stainless steel with a Inconel 718 powder, developed through microwave hybrid heating route. The average thickness of clads was found to be nearly 1 mm. The microstructural study revealed excellent metallurgical bonding between clad and substrate. The clad layer is developed due to partial melting of outer layer of substrate and partial diffusion of powder particles into the substrate. The phases developed in clads were characterised using X-ray diffraction. Clads were further investigated using Field emission- Scanning Electron Microscope and Elemental Analysis. The clads developed were free from porosity and interfacial cracking.

Flow Simulation and Size Optimization of Centrifugal Impeller

Volume No. 2

Year: 2013

Issue: Nov-Jan

Title: Flow Simulation and Size Optimization of Centrifugal Impeller

Author Name: WESAM SALMAN, S Pavithran

Synopsis:

The important parameters affecting the impeller performance are the impeller diameter ratio, blade angles and number of blades. The current work describes the design and redesign (Size Optimization) of a 3D centrifugal impeller. Three impeller models with different shape numbers are considered. The initial design is carried out by using the design procedure and empirical equations.  The flow field is obtained by computational flow simulation. Specific work and shaft power are obtained from the simulation and are used to calculate the impeller design efficiency. Thereafter, for a given specific work and flow rate, the impeller size is decreased gradually. As a result, the impeller number of blades and outlet blade angle are recalculated in order to maintain the model design specific work. This is done as before using the standard design procedure. Then, the flow field is simulated to calculate the efficiency. The flow simulation outcomes validate the design and redesign procedure. Accordingly, the efficiency curve against impeller sizes is plotted to study the effect of changing the impeller diameter ratio on the efficiency. Further, the predicted specific work curves for original and optimized impeller are plotted and compared. Finally, for each model, the corresponding peak efficiency size is selected. As expected, the higher diameter ratios are obtained for lower shape numbers. The number of blades and the outlet blade angle increase with decrease in diameter ratio. The lowest diameter ratio is obtained under the conditions that the efficiency be more than 95% of the peak one and the number of blades be under 16.