Enhanced process parameters using TOPSIS method during Wire electro discharge machining of TiNiCo shape memory alloy
- Soni, Hargovind, Narendranath, S., Ramesh, M.R., Mashinini, P.M.
- Authors: Soni, Hargovind , Narendranath, S. , Ramesh, M.R. , Mashinini, P.M.
- Date: 2020
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/411143 , uj:34538 , Citation: Soni, H. et al. 2020. Enhanced process parameters using TOPSIS method during Wire electro discharge machining of TiNiCo shape memory alloy.
- Description: Abstract: Shape memory alloys (SMAs) are most usable material in the field of biomedical, aerospace and robotics applications due to their unique class of properties. Super elasticity, shape memory effect and two phase transformation behaviour of these alloys make unique material. Machining of such kind of material is quite difficult through conventional machining process hence non-conventional machining of these materials is suitable. Ti50Ni40Co10 shape memory alloy was developed through Vacuum arc melting furnace for the present study. Wire electro discharge machining (A Non-conventional Machining) was used for machining of Ti50Ni40Co10 shape memory alloy. Moreover Topsis method implemented for the parametric optimization of wire electro discharge machining (WEDM). Pulse on time, Pulse off time, Servo voltage, wire speed and servo feed were considered as process parameters and productivity rate and surface quality (average roughness) were consider as output process parameters of WEDM. To see the effect of machining on the machined component EDX analysis has been carried out of optimal process parameters setting. 4.72 mm3 /min productivity rate and 1.26 µm average roughness was found at optimal combination of process parameters of WEDM. Moreover, during the EDX analysis Cu, Zn, O and C were noticed on the machined surface including the parent material.
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- Authors: Soni, Hargovind , Narendranath, S. , Ramesh, M.R. , Mashinini, P.M.
- Date: 2020
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/411143 , uj:34538 , Citation: Soni, H. et al. 2020. Enhanced process parameters using TOPSIS method during Wire electro discharge machining of TiNiCo shape memory alloy.
- Description: Abstract: Shape memory alloys (SMAs) are most usable material in the field of biomedical, aerospace and robotics applications due to their unique class of properties. Super elasticity, shape memory effect and two phase transformation behaviour of these alloys make unique material. Machining of such kind of material is quite difficult through conventional machining process hence non-conventional machining of these materials is suitable. Ti50Ni40Co10 shape memory alloy was developed through Vacuum arc melting furnace for the present study. Wire electro discharge machining (A Non-conventional Machining) was used for machining of Ti50Ni40Co10 shape memory alloy. Moreover Topsis method implemented for the parametric optimization of wire electro discharge machining (WEDM). Pulse on time, Pulse off time, Servo voltage, wire speed and servo feed were considered as process parameters and productivity rate and surface quality (average roughness) were consider as output process parameters of WEDM. To see the effect of machining on the machined component EDX analysis has been carried out of optimal process parameters setting. 4.72 mm3 /min productivity rate and 1.26 µm average roughness was found at optimal combination of process parameters of WEDM. Moreover, during the EDX analysis Cu, Zn, O and C were noticed on the machined surface including the parent material.
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Influence of laser power and traverse speed on weld characteristics of laser beam welded Ti-6Al-4V sheet
- Mashinini, P.M., Hattingh D.G.
- Authors: Mashinini, P.M. , Hattingh D.G.
- Date: 2018
- Subjects: Laser beam welding , Ti6Al4V , Traverse speed
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/273269 , uj:29109 , Citation: Mashinini, P.M. & Hattingh D.G. 2018. Influence of laser power and traverse speed on weld characteristics of laser beam welded Ti-6Al-4V sheet. Materials Research Proceedings 4 (2018) 59-64 doi: http://dx.doi.org/10.21741/9781945291678-9.
- Description: Abstract: In this paper laser beam welding was used for joining 3 mm Ti-6Al-4V alloy sheets in a full penetration butt-weld configuration. Laser beam power and traverse speed were the only parameters varied in an attempt to characterize the influence on weld integrity with specific reference to residual stress and microstructural modifications. The iXRD residual stress data showed a definite influence of traverse speed on residual stresses, with low traverse speeds resulting in an increased tensile residual stresses in the longitudinal direction of the weld whilst in the transverse direction residual stress revealed a more compressive stress state. The residual stress data for this experiment compared favourably with published residual stresses data done by synchrotron X-ray diffraction. Weld joint integrity was further analyzed by evaluating the microstructure transformation in the weld nugget. These results revealed a degree of grain growth and the presences of fine acicular b (needle-like a) in prior b grain boundaries with increased traverse speed. Grain growth was predominantly influenced by the cooling rate which is associated with traverse speed. Additionally, the a-phase and b-phase were characterized in the various weld zones by electron backscatter diffraction (EBSD).
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- Authors: Mashinini, P.M. , Hattingh D.G.
- Date: 2018
- Subjects: Laser beam welding , Ti6Al4V , Traverse speed
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/273269 , uj:29109 , Citation: Mashinini, P.M. & Hattingh D.G. 2018. Influence of laser power and traverse speed on weld characteristics of laser beam welded Ti-6Al-4V sheet. Materials Research Proceedings 4 (2018) 59-64 doi: http://dx.doi.org/10.21741/9781945291678-9.
- Description: Abstract: In this paper laser beam welding was used for joining 3 mm Ti-6Al-4V alloy sheets in a full penetration butt-weld configuration. Laser beam power and traverse speed were the only parameters varied in an attempt to characterize the influence on weld integrity with specific reference to residual stress and microstructural modifications. The iXRD residual stress data showed a definite influence of traverse speed on residual stresses, with low traverse speeds resulting in an increased tensile residual stresses in the longitudinal direction of the weld whilst in the transverse direction residual stress revealed a more compressive stress state. The residual stress data for this experiment compared favourably with published residual stresses data done by synchrotron X-ray diffraction. Weld joint integrity was further analyzed by evaluating the microstructure transformation in the weld nugget. These results revealed a degree of grain growth and the presences of fine acicular b (needle-like a) in prior b grain boundaries with increased traverse speed. Grain growth was predominantly influenced by the cooling rate which is associated with traverse speed. Additionally, the a-phase and b-phase were characterized in the various weld zones by electron backscatter diffraction (EBSD).
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Investigation on dry machining of stainless steel 316 using textured tungsten carbide tools
- Mashinini, P.M., Soni, Hargovind, Gupta, Kapil
- Authors: Mashinini, P.M. , Soni, Hargovind , Gupta, Kapil
- Date: 2020
- Subjects: Machinability , MRR , Stainless steel
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/411192 , uj:34544 , Citation: P M Mashinini et al 2020 Mater. Res. Express 7 016502 , DOI: https://doi.org/10.1088/2053-1591/ab5630
- Description: Abstract: In this research, austenitic stainless steel SS316 material has been machined using textured carbide cutting tools under dry conditions. Micro-textures were made on tool rake face using wire spark erosion machining technology. Effects of three important machining process parameters i.e. cutting speed, depth of cut and feed rate on machinability (MRR, average roughness, and tool wear) of SS316 have been investigated. Taguchi L27 orthogonal array based twenty seven experiments have been carried out by varying machining parameters at three levels. Feed rate has been identified as the most important parameter. Machining parameters have been optimized by grey entropy method to enhance the machinability. Optimal combination of machining parameters i.e. 170 m min−1 cutting speed, 0.5 mm/rev feed rate and 1.5 mm depth of cut produced the best machinability with 3.436 μm average roughness, 105187 mm3 min−1 . MRR, and tool wear 234.63 μm. Lastly, a tool wear and chip morphology study have been done where textured tools have been found outperformed plain (Non-textured) tools.
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- Authors: Mashinini, P.M. , Soni, Hargovind , Gupta, Kapil
- Date: 2020
- Subjects: Machinability , MRR , Stainless steel
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/411192 , uj:34544 , Citation: P M Mashinini et al 2020 Mater. Res. Express 7 016502 , DOI: https://doi.org/10.1088/2053-1591/ab5630
- Description: Abstract: In this research, austenitic stainless steel SS316 material has been machined using textured carbide cutting tools under dry conditions. Micro-textures were made on tool rake face using wire spark erosion machining technology. Effects of three important machining process parameters i.e. cutting speed, depth of cut and feed rate on machinability (MRR, average roughness, and tool wear) of SS316 have been investigated. Taguchi L27 orthogonal array based twenty seven experiments have been carried out by varying machining parameters at three levels. Feed rate has been identified as the most important parameter. Machining parameters have been optimized by grey entropy method to enhance the machinability. Optimal combination of machining parameters i.e. 170 m min−1 cutting speed, 0.5 mm/rev feed rate and 1.5 mm depth of cut produced the best machinability with 3.436 μm average roughness, 105187 mm3 min−1 . MRR, and tool wear 234.63 μm. Lastly, a tool wear and chip morphology study have been done where textured tools have been found outperformed plain (Non-textured) tools.
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Microstructure evolution and mechanical characterization of friction stir welded titanium alloy Ti–6Al–4V using lanthanated tungsten tool
- Mashinini, P.M., Dinaharan, I., Selvama, J. David Raja, Hattingh, D.G.
- Authors: Mashinini, P.M. , Dinaharan, I. , Selvama, J. David Raja , Hattingh, D.G.
- Date: 2018
- Subjects: Titanium alloy , Friction stir welding , Microstructure
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/273276 , uj:29110 , Citation: Mashinini, P.M. et al. 2018. Microstructure evolution and mechanical characterization of friction stir welded titanium alloy Ti–6Al–4V using lanthanated tungsten tool.
- Description: Abstract: Friction stir welding (FSW) exhibits significant advantages to join titanium and its alloys compared to other welding methods. FSW of 3 mm thick titanium alloy Ti–6Al–4V sheets was carried out using a lanthanated tungsten alloy tool. The traverse speed was varied from 40 mm/min to 200 mm/min in steps of 80 mm/min by keeping other parameters constant. The microstructure evolution was observed using conventional and advanced characterization techniques. The micrographs revealed a fully developed lamellar structure at 40 mm/min and a recrystallized structure in rest of the joints. An increase in β phase was observed at HAZ while TMAZ showed a distorted structure. The average grain size was observed to reduce with an increase in traverse speed. No tool wear debris was observed in the stir zone while a worm hole defect was noticed at 200 mm/min. Ti–6Al–4V hardened...
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- Authors: Mashinini, P.M. , Dinaharan, I. , Selvama, J. David Raja , Hattingh, D.G.
- Date: 2018
- Subjects: Titanium alloy , Friction stir welding , Microstructure
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/273276 , uj:29110 , Citation: Mashinini, P.M. et al. 2018. Microstructure evolution and mechanical characterization of friction stir welded titanium alloy Ti–6Al–4V using lanthanated tungsten tool.
- Description: Abstract: Friction stir welding (FSW) exhibits significant advantages to join titanium and its alloys compared to other welding methods. FSW of 3 mm thick titanium alloy Ti–6Al–4V sheets was carried out using a lanthanated tungsten alloy tool. The traverse speed was varied from 40 mm/min to 200 mm/min in steps of 80 mm/min by keeping other parameters constant. The microstructure evolution was observed using conventional and advanced characterization techniques. The micrographs revealed a fully developed lamellar structure at 40 mm/min and a recrystallized structure in rest of the joints. An increase in β phase was observed at HAZ while TMAZ showed a distorted structure. The average grain size was observed to reduce with an increase in traverse speed. No tool wear debris was observed in the stir zone while a worm hole defect was noticed at 200 mm/min. Ti–6Al–4V hardened...
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Optimization of the surface quality in illing achine using PVC composite plate
- Ahirwar, Yashwant, Soni, Hargovind, Mashinini, P.M.
- Authors: Ahirwar, Yashwant , Soni, Hargovind , Mashinini, P.M.
- Date: 2020
- Subjects: Milling machine , Poly vinyl chloride (PVC) plate , Composite materials
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/411216 , uj:34547 , Citation: Ahirwar, Y., Soni, H. & Mashinini, P.M. 2020. Optimization of the surface quality in illing achine using PVC composite plate.
- Description: Abstract: The objective of this work is to investigate the influence of machining parameters namely; feed, speed, depth of cut and number of plate on average roughness in milling machine using Poly vinyl chloride (PVC) composite plate. The four machining parameters are each set at three levels using response surface methodology (RSM) design. Unwanted vibrations & noise were eliminated in order to ensure higher accuracy and surface finish along with productivity. Experiment wise investigation of the PVC plates is fixed on to the slotted table below the workpiece specimen milling operation is carried out. The experiment was repeated for different sets of PVC plates, it was observed that the average roughness (Ra) decreases with increase in number of layers of sheets of composites plates.
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- Authors: Ahirwar, Yashwant , Soni, Hargovind , Mashinini, P.M.
- Date: 2020
- Subjects: Milling machine , Poly vinyl chloride (PVC) plate , Composite materials
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/411216 , uj:34547 , Citation: Ahirwar, Y., Soni, H. & Mashinini, P.M. 2020. Optimization of the surface quality in illing achine using PVC composite plate.
- Description: Abstract: The objective of this work is to investigate the influence of machining parameters namely; feed, speed, depth of cut and number of plate on average roughness in milling machine using Poly vinyl chloride (PVC) composite plate. The four machining parameters are each set at three levels using response surface methodology (RSM) design. Unwanted vibrations & noise were eliminated in order to ensure higher accuracy and surface finish along with productivity. Experiment wise investigation of the PVC plates is fixed on to the slotted table below the workpiece specimen milling operation is carried out. The experiment was repeated for different sets of PVC plates, it was observed that the average roughness (Ra) decreases with increase in number of layers of sheets of composites plates.
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Wire electro spark machinining and characterization studies on Ti50Ni49Co1, Ti50Ni45Co5 and Ti50Ni40Co10 alloys
- Soni, Hargovind, Mashinini, P.M.
- Authors: Soni, Hargovind , Mashinini, P.M.
- Date: 2020
- Subjects: TiNiCo based alloys , Wire EDM , Surface topography,
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/411184 , uj:34543 , Citation: Soni, H. & Mashinini, P.M. 2020. Wire electro spark machinining and characterization studies on Ti50Ni49Co1, Ti50Ni45Co5 and Ti50Ni40Co10 alloys.
- Description: Abstract: The wire electrical discharge machining process (WEDM) is high demand and influenced by various input process parameters namely pulse duration, voltage, wire diameters and wire material. In this research a smart material made of TiNiCo alloy is investigated to study the machinability using WEDM process. The pulse duration and servo voltage varied to perform the experiments on Ti50Ni49Co1 Ti50Ni45Co5 and Ti50Ni40Co10 smart materials for bone staple applications which was designed by ELCAM software and generated G-code for machining with same software. L-25 orthogonal array used for machining of selected alloys, which is created (L-25 orthogonal array) through Taguchi design of experiment. From the experiments analysis are made to study the amount of material removal and average roughness as response. Further machined areas are subjected to metallurgical characterizations techniques such as surface topography, X-ray diffraction, residual stress calculation and wear mechanism to discuss in details. Tensile residual stress were noticed at higher values of outputs while lower values of residual stress at lower values of outputs which is also confirm through microstructure and surface topography that smoother surface has been found at lower values of outputs. Moreover XRD analysis exhibits the oxide formation on the machined surface due to partial oxidation and vaporization of fused metal.
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- Authors: Soni, Hargovind , Mashinini, P.M.
- Date: 2020
- Subjects: TiNiCo based alloys , Wire EDM , Surface topography,
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/411184 , uj:34543 , Citation: Soni, H. & Mashinini, P.M. 2020. Wire electro spark machinining and characterization studies on Ti50Ni49Co1, Ti50Ni45Co5 and Ti50Ni40Co10 alloys.
- Description: Abstract: The wire electrical discharge machining process (WEDM) is high demand and influenced by various input process parameters namely pulse duration, voltage, wire diameters and wire material. In this research a smart material made of TiNiCo alloy is investigated to study the machinability using WEDM process. The pulse duration and servo voltage varied to perform the experiments on Ti50Ni49Co1 Ti50Ni45Co5 and Ti50Ni40Co10 smart materials for bone staple applications which was designed by ELCAM software and generated G-code for machining with same software. L-25 orthogonal array used for machining of selected alloys, which is created (L-25 orthogonal array) through Taguchi design of experiment. From the experiments analysis are made to study the amount of material removal and average roughness as response. Further machined areas are subjected to metallurgical characterizations techniques such as surface topography, X-ray diffraction, residual stress calculation and wear mechanism to discuss in details. Tensile residual stress were noticed at higher values of outputs while lower values of residual stress at lower values of outputs which is also confirm through microstructure and surface topography that smoother surface has been found at lower values of outputs. Moreover XRD analysis exhibits the oxide formation on the machined surface due to partial oxidation and vaporization of fused metal.
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