In the present study, dissimilar friction welding between super alloy 718 and carbon steel friction welded to evaluate the formation of microstructure in the weld interface and in superalloy 718. The temperature during friction welding at weld interface was recorded to determine the temperature effect on the microstructural changes on alloy 718 side. The finite element modeling of weld interface temperature, deformation and stresses were evaluated and validated with the experimental results. The microstructural observation along with the weld interface and adjacent regions are studied. The effect of friction welding on superalloy weld interface and microstructural formation were investigated under electron backscattered diffraction analysis to evaluate the grain size measurements. The effect of thermomechanical action on the microstructure was evaluated by texture analysis.

Friction Welding

Texture (cosmology)

10.4028/www.scientific.net/msf.969.211

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Citations (23)

Effect of Graphite on Mechanical and Tribological Properties of Al6061/SiC Hybrid Composites

Annales de Chimie Science des Matériaux (2023)

Papabathina Mastan Rao Siva Sankara Babu Chinka P. Nageswara Rao M. Vijaya Sneha H. Dhoria

This study investigates the effects of incorporating graphite into a Al6061/SiC hybrid metal matrix composite on its mechanical and wear properties.The composites are fabricated using a stir casting technique, with SiC and Graphite particles added in different weight percentages ranging from 2-8%.Mechanical properties such as hardness, tensile strength, flexural strength, and compressive strength are evaluated.Results show that the composite with 6 wt.% of hybrid reinforcement exhibits significant improvement in hardness (30%), tensile strength (10.82%), compressive strength (68.14%), and flexural strength (85%) compared to pure Al6061 alloy.Furthermore, a wear test is performed using a pin-on-disc machine under dry conditions to assess the influence of parameters on the wear rate and coefficient of friction (COF).Tests are conducted at various loads (1-3 kgf), sliding speeds (150-450 rpm), and sliding distances (1000-2000 m).Among all reinforcements, the composite with 6% hybrid reinforcement exhibits the lowest wear rate and COF.Overall, this study provides valuable insights into the mechanical and wear properties of Al6061/SiC/graphite hybrid composites and highlights their potential for various industrial applications.These findings may pave the way for further research in the field of metal matrix composites and their applications.

10.18280/acsm.470301

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Citations (3)

Multi-Response Optimization of process Parameter in Vertical Milling Machine of EN 31 Using Taguchi Method

Journal of University of Shanghai for Science and Technology (2021)

S.Venkatesh Kumar P. Nageswara Rao

The purpose of this experimental research is to compare the effectiveness of using Taguchi approaches for multi-response optimization of process parameters in Vertical Milling Machine of EN 31 Material intending to minimize surface roughness and tool wear rate while maximizing material removal rate to improve the productivity of the process with coated carbide insert. Taguchi L9 and Annova have been applied for experimental design and analysis. This experiment shows that feed and depth of cut are factors that are important for tool wear, Depth of cut is a notable factor for Material Removal Rate and feed is the most notable factor for surface roughness. Spindle speed has little effect on tool wear rate, surface roughness, and material removal rate. Mathematical models for three response parameters i.e. tool wear rate, surface roughness, and material removal rate were obtained by regression analysis

Design of experiments

Orthogonal array

Process variable

10.51201/jusst/21/11890

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Citations (1)

Optimization of Vegetable Oil Properties in Machining Environment Through CFD

International Journal of Innovative Technology and Exploring Engineering (2019)

Suresh Babu Valeru P. Nageswara Rao K.N.S. Suman

Various vegetable oils were widely used as a lubricant in machining since 1990‘s. However during machining of various materials, various vegetable oils gave superior performance related to other oils which is due to their individual thermo physical properties. So that the prediction of influencing properties of various vegetable oils novel technique. Therefore in the present work turning of AISI 304 steel with carbide tool is taken as a case study for ascertaining the influence of vegetable oil properties in the machining environment. Among the fluid properties, properties such as viscosity, thermal conductivity, density and specific heat are taken for optimization. For optimization of fluid properties initially DOE Technique has been adopted, using which L16 orthogonal array has been formed for carrying out the simulations. CFD analysis with proper boundary conditions has been adopted for predictions the generated temperature at a constant distance from tool tip. From the obtained results, it is perceived that thermal conductivity is performed a major role to reducing of generated temperature within the tool followed by viscosity and specific heat whereas effect of density on generated temperature is found to be least significant. Therefore the present work highlights the combinations of DOE approach and CFD analysis in predicting the influence of vegetable oil properties and their values in the machining environment

Vegetable oil

Design of experiments

10.35940/ijitee.k1952.1081219

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Citations (5)