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Austine D. D’Souza,Shrikantha S. Rao,Mervin A. Herbert 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.9
A vast majority of the research on friction stir welding(FSW) is mainly focused on welding of aluminium alloys. The researchstudies in this paper are based on one such alloy known as Al–Ce–Si–Mg aluminium alloy, of which, the microstructure andother mechanical properties of the friction stir welded joints are yet to be studied. The plates of Al–Ce–Si–Mg aluminiumalloy were friction stir welded using a non consumable, rotating tool with triangular profile pin and circular shoulder, withdifferent combinations of tool rotation speeds and weld speeds. The microstructure, hardness and mechanical properties ofthe weld were analyzed. The microstructure of the weld zones revealed that, the average grain size at the bottom of the NuggetZone (NZ) is 5 ± 0.12 μm and gradually increases to 15 ± 0.23 μm at the top of the NZ. In the TMAZ the grain size is20 ± 0.14 μm and is bigger compared to the NZ. In the HAZ, the grain size is around 37 ± 0.21 μm and is bigger than that inthe TMAZ. The maximum Vickers hardness value at the NZ center is 231.9 ± 2 Hv, and uniformly reduces to 100 ± 2.4 Hvin the TMAZ and 65 ± 1.3 Hv in the HAZ and then increases to 98 ± 1 Hv in the base material (BM). The maximum ultimatetensile strength (UTS) of FSW joint was found to be around 102.55 ± 3 MPa with elongation at fracture of 2.5%. The BMUTS was 154 ± 4.5 MPa. For a tool rotation speed of 800RPM and a weld speed of 20 mm/min a maximum joint efficiencyof 67%. was obtained. Hence these were chosen as the optimum process parameters to join the alloy Al–Ce–Si–Mg by FSW.
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P. G. Mukunda,Shailesh Rao A,Shrikantha S Rao 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.1
Although the manner in which the molten metal flows plays a major role in the formation of the uniform cylinder in centrifugal casting, not much information is available on this topic. The flow in the molten metal differs at various rotational speeds, which in turn affects the final casting. In this paper, the influence of the flow of molten metal of hyper eutectic Al-2Si alloys at various rotational speeds is discussed. At an optimum speed of 800 rpm, a uniform cylinder was formed. For the rotational speeds below and above these speeds, an irregular shaped casting was formed, which is mainly due to the influence of melt. Primary á-Al particles were formed in the tube periphery at low rotational speed, and their sizes and shapes were altered with changes in rotational speeds. The wear test for the inner surface of the casting showed better wear properties for the casting prepared at the optimum speed of rotation.
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Rashmi LMalghan,Karthik Rao M C,ArunKumar S,Shrikantha S Rao,Mervin A Herbert 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.5
The influence of cutting parameters on the responses in face milling has been examined. Spindle speed, feed rate and depth of cut have been considered as the influential factors. In accordance with the design of experiments (DOE) a series of experiments have been carried out. The paper exemplifies on the optimizing the process parameters in milling through the application of Response surface methodology (RSM), RSM-based Particle Swarm Optimization (PSO) technique and Desirability approach. These aforesaid techniques have been applied to experimentally establish data of AA6061 aluminium material to study the effect of process parameters on the responses such as cutting force, surface roughness and power consumption. By adopting the multiple regression techniques, the interaction between the process parameters are acquired. The optimal parameters have been found by adopting the multi-response optimization techniques, i.e. desirability approach and PSO. The performance capability of PSO and desirability approach is investigated and found that the values obtained from PSO are comparable with the values of desirability approach.
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