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Sree Sabari, S.
- Corrosion and Metallurgical Characteristics of AZ31B Magnesium Alloy Under NaCl Environment
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Authors
Affiliations
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
Source
Manufacturing Technology Today, Vol 15, No 11 (2016), Pagination: 9-28Abstract
An investigation was carried out to quantify and characterize the corrosion behaviour of AZ31B magnesium alloy. The specimens were underwent immersion, salt spray, pitting and galvanic corrosion tests in order to quantify and characterize the corrosion rates of the AZ31B specimens with the influence of different pH values, chloride ion concentration and the corrosion time. An attempt was also made to develop an empirical relationship to predict the corrosion rate of AZ31B magnesium alloy. Three factors, five level, central composite rotatable design matrix was used to minimize the number of experimental conditions. Response surface methodology was used to develop the relationship. The developed relationship can be effectively used to predict the corrosion rate of AZ31B magnesium alloy at 95% confidence level. The results show that the corrosion rate was higher in salt spray corrosion tests than the immersion, pitting and galvanic corrosion tests.Keywords
AZ31B Magnesium Alloy, Response Surface Methodology, Corrosion Rate.
References
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- Effect of Tool Pin Profiles on Joint Characteristics of Under Water Friction STIR Welded AA2519-T87 Aluminium Alloy
Abstract Views :141 |
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Authors
Affiliations
1 Dept of Manufacturing Engg, Annamalai University, Annamalai Nagar, Tamil Nadu, IN
2 Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, IN
1 Dept of Manufacturing Engg, Annamalai University, Annamalai Nagar, Tamil Nadu, IN
2 Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, IN
Source
Manufacturing Technology Today, Vol 14, No 11 (2015), Pagination: 21-28Abstract
AA2519-T87 is an age hardenable aluminium alloy used in the fabrication of light combat vehicles in the military application. Fusion welding of this aluminium alloy results in solidification related problems like porosity, hot cracking, etc. In order to overcome such problems, friction stir welding (FSW) process is used to join this material. The thermal cycle experienced by the thermo mechanical affected zone (TMAZ) and heat affected zone (HAZ) is causing grain coarsening and precipitates dissolution and resulting in poor joint properties. To get rid of this problem, under water friction stir welding (UWFSW) process can be adopted. However, the material flow during friction stirring will be entirely different in FSW and UWFSW. Hence an investigation is undertaken to study the effect of tool pin profiles on stir zone characteristics and the resultant tensile properties of the joints fabricated by UWFSW. Four different pin profiles, namely, straight cylindrical (STC), taper cylindrical (TAC), straight threaded cylindrical (STC), and taper threaded cylindrical (TTC) were used to fabricate the joints. From this investigation, it is found that the joint made by taper threaded pin profiled tool exhibited higher tensile properties and this may be attributed to the grain boundary strengthening and narrowing of lower hardness distribution region (LHDR).Keywords
Underwater Friction Stir Welding, Pin Profiles, Microstructure, Tensile Properties, Microhardness.- Simulation of Temperature and Residual Stress Field in Friction Stir Welded AISI 304 Stainless Steel Joints
Abstract Views :141 |
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Authors
Affiliations
1 Dept of Mech Engg., Sree Vidyanikethan Engineering College, Tirupati, AP, IN
2 Centre for Materials Joining Research (CEMAJOR), Dept of Manufacturing Engg., Annamalai University, Annamalai Nagar, TN, IN
1 Dept of Mech Engg., Sree Vidyanikethan Engineering College, Tirupati, AP, IN
2 Centre for Materials Joining Research (CEMAJOR), Dept of Manufacturing Engg., Annamalai University, Annamalai Nagar, TN, IN
Source
Manufacturing Technology Today, Vol 17, No 1 (2018), Pagination: 7-13Abstract
Three-dimensional nonlinear thermal and thermo-mechanical numerical simulations are conducted for the friction stir welding of AISI 304 stainless steel. The finite element analysis code SYSWELD was used to simulate the results using inverse approach. Defect free welds were made experimentally using a rotational speed, welding speed and shoulder diameter of 800 rpm, 90 mm/min and 20 mm respectively. Residual stress measurement was carried out with X-ray stress analyzer employing CrKα radiation. The transient temperature fields were obtained by finite element simulation and the residual stresses in the welded plate are calculated using a three-dimensional elastic–plastic thermo-mechanical simulation. The results of the simulation are in good agreement with that of experimental results.Keywords
Stainless Steel, Friction Stir Welding, Finite Element Analysis, Temperature Distribution, Residual Stress.- Application of Desirability Based Hybrid Anfis Model for Optimization of Electro Discharge Machining of Hastealloy C-276
Abstract Views :174 |
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Authors
Affiliations
1 Department of Mechanical Engineering, Sree Vidyanikethan Engineering College, Tirupati, Andhra Pradesh, IN
1 Department of Mechanical Engineering, Sree Vidyanikethan Engineering College, Tirupati, Andhra Pradesh, IN
Source
Manufacturing Technology Today, Vol 17, No 7 (2018), Pagination: 32-43Abstract
Hastealloy C-276 is a difficult to machine superalloy and comprehensively employed in various engineering fields such as nuclear applications, aerospace and gas turbines. Hastealloy C-276 having better strength and poor thermal conductivity makes them difficult to machine materials which results in reduced life of the cutting tool and poor machinability by conventional methods of material removal. Advanced metal removal methods have evolved to accomplish those kind of needs and appealed to be an opposite alternative approach to traditional machining. Electro Discharge Machining (EDM) is considered as one of the nontraditional metal removal process which is especially adopted for machining of hard to machine materials. In this present investigation Spark Erosion Machining has been employed for machining of Haste Alloy C-276 with copper electrode by using Taguchi’s experimental design approach. Applied current (A), pulse on time (TON) and pulse off time (TOFF) were considered as the input process variables and the performance of spark erosion machining has been assessed by considering the performance measures such as material removal rate, surface roughness, overcut, form and orientation tolerance errors. The significance of process variables were analyzed by Analysis of Variance (ANOVA). Multi objective optimization has been performed by desirability function analysis to obtain better machining performance. In addition DFA based Adaptive Neuro Fuzzy Inference System (ANFIS) have been evolved to optimize the desired performance characteristics.Keywords
EDM, Haste Alloy, Taguchi’s Design, Desirability Function Analysis, ANFIS.References
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- Experimental Investigations on Wire Edm of AI-SiC Composite Using Taguchi’s Approach
Abstract Views :210 |
PDF Views:2
Authors
Affiliations
1 Department of Mechanical Engineering, Sree Vidyanikethan Engineering College Autonomous), Tirupati, Andhra Pradesh, IN
1 Department of Mechanical Engineering, Sree Vidyanikethan Engineering College Autonomous), Tirupati, Andhra Pradesh, IN
Source
Manufacturing Technology Today, Vol 17, No 9 (2018), Pagination: 12-20Abstract
The machinability study on Wire Electro Discharge Machining (WEDM) of Al6061/20%SiC has been investigated in the present exploration. The objective of this present investigation is to determine the best possible process parameter to obtain better machining performance during wire EDM of Al6061 matrix reinforced with 20 wt. % SiC which is fabricated through the stir casting processes. The machining parameters such as pulse on time, pulse off time (delay time) and servo voltage are deemed as input process variables. Rate of material removal and roughness of the machined surface were considered as performance measures under this investigation. Taguchi’s design of experiment approach has been adopted for designing the experimental runs and L9 orthogonal array has been selected for conducting the experiments. Analysis of Variance (ANOVA) is adopted for ascertaining the significance of process parameters. Taguchi’s response analysis has been employed to determine the ascendancy of process parameters and the optimum process parameters were determined to obtain better machining performance.Keywords
Al-SiC Composites, WEDM, Taguchi’s Approach, Orthogonal Array, ANOVA, Optimization.References
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