Wire Electrical Discharge Machining (WEDM) of Hybrid Composites (Al-Si12/B4C/Fly Ash)

Abstract

The present study looks into the effect of WEDM process parameters on the material removal rate (MRR) and surface roughness (SR) responses when machining hybrid composites (Al-Si12/boron carbide/fly ash) using the Taguchi technique. Fly ash and boron carbide (B₄C) particles were used for reinforcement (3%, 6%, and 9% by weight), and aluminium alloy (Al-Si12) was used as a matrix material. ANOVA was used to find out the importance of machining factors that affect the quality features of the WEDM process, as well as the relative role of input parameters in determining the WEDM process’ responses. The greatest impact on the response is finalised by the signal-to-noise (S/N) ratio response analysis. However, as a last step, a confirmation experiment with the best combination was carried out to predict and validate the accuracy of the observed values. As the pulse on time and reinforcement increases, MRR also increases. As the gap voltage, wire feed, and pulse off time decrease, it increases. SR is increased by increasing the gap voltage, pulse on time, and pulse off time, wire feed, and reinforcement. The maximum MRR of 38.01 mm³/min and the minimum SR of 3.24 μm were obtained using optimal machining conditions.

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

1. Introduction

Composite materials are produced by combining two or additional materials in order that they mechanically function as one single entity. A hard phase may be incorporated into a soft phase or vice versa. The hard phase functions as a reinforcing agent in most composite materials, increasing elastic modulus, while the soft phase serves as a matrix. The advantage of using composites is that they can achieve proved to be beneficial and may end up in a variety of service advantages such as enhanced strength, significantly reduced weight, enhanced wear resistance, and high elastic modulus [1]. The foremost benefit of composites is the potential of their mechanical and physical properties to be aimed at meeting unique design standards. Particulate-reinforced metal matrix composites (MMCs) possess high stiffness but low strength, as well as outstanding fabricability, less cost, and homogeneity. The traditional reinforcement materials for AMCs are SiC and Al₂O₃. Because B₄C powder is more expensive than SiC and Al₂O₃, there have been few studies on boron carbide-reinforced MMCs. There is a growing demand for composites with low-density, low-cost reinforcement particles. Fly ash is a lightweight, lower cost material that is widely available [2]. As a result, fly ash-reinforced composites are liable to break through the price barrier for the widespread use in automobiles. The insertion of fly ash particles increases the hardness, rigidity, impact resistance, and damping qualities of Al alloys while decreasing their density. Al-fly ash composites offer potential uses in the automobile, turbocharged engine, and electrical industries as cloaks, shells, shafts, coverings, plates, manifolds, valve encompasses, brake discs, and other engine parts.

Metal matrix composites have the potential to outperform traditional metals in terms of efficiency, dependability, and mechanical performance. When compared to continuously reinforced competitors, particle-reinforced MMCs are particularly appealing since they display isotropic characteristics [3]. Particulate-reinforced MMCs have the added benefit of being malleable and workable. The fundamental disadvantage of MMCs is that they have poor mechanical properties and fracture toughness in comparison to their matrix material. Stir casting is the most cost-effective of all MMC industrial uses. It entails mechanically mixing the reinforcing particles into a liquid metal bath and directly moving the mix to a mould [4]. The most important aspect of this technique is achieving adequate wetting between both the particle reinforcements and the molten metal. Because of the contact between flocculated ceramic particles and the solid-liquid interface, it is difficult to achieve homogeneous reinforcement distribution in these cast composite materials. This method may be used to create very big components. A considerable number of engineers and scientists are now researching the synthesis, characterisation, and performance assessment of DRMMCs in universities and research institutes. DRMMCs have found applications in aircraft, automotive, and a variety of other scientific and commercial fields.

Clearly, the liquid metallurgical process is the most economically feasible of all MMC manufacturing techniques. The stir casting process, often known as the vortex technique, is the most basic and widely used technique. In general, ceramic particles with sizes ranging from 5 to 100 μm may be included in a wide spectrum of molten aluminium alloys. Furthermore, this technique enables the fabrication of very massive components. The microstructure and hardness of composites are influenced by the stirring speed and duration. At 600 rpm and 10 minutes of stirring, uniform particle dispersion and higher hardness values were attained [5].

In the aluminium 2024 matrix, larger B₄C particles 71 μm were typically homogenous, but smaller particles (29 μm) caused clumping, segregation, and high porosity. The density of the composites dropped as the volume percentage of the particles increased and the particle size decreased; the porosity and hardness of the composites increased as the content increase and the particle size decreased [6]. The inclusion of B₄C particles significantly enhanced the abrasive wear characteristics of the 2024 aluminium alloy. According to microstructural analysis, the B₄C particles were uniformly dispersed. In the stir casting process, the particle dispersion of B₄C enhanced by the inclusion of 250°C warmed particles, which resulted in a homogeneous grain structure in the composite [7]. Si is crucial in the development of a barrier layer, which can restrict B₄C breakdown and increase B₄C stability in the aluminium melt.

Magnesium plays a critical role in composite fabrication by removing O₂ first from dispersed surfaces, reducing the gaseous layer, and enhancing wetting. The first 1 wt% Mg addition results in a very dramatic drop in surface tension. However, as Mg concentration increases, the reduction becomes extremely minor. Magnesium and aluminium mixtures appear to have a synergistic impact on wetting. The particle dispersion of fly ash is consistent and strong interfacial bonding exists between the matrix and the fly ash particles.

Fly ash is abundant as a waste by-product of coal-fired power plants’ combustion processes. It is used in aluminium castings to reduce energy capacity, material content, price, and mass of components, as well as enhance wear resistance. The matrix and fly ash particles have strong interfacial bonding. The hardness rises as the fly ash concentration increases. The composite’s mechanical characteristics are improved, but its ductility is decreased when the weight of the fly ash particles increases. The micrographs of the samples indicate that the fly ash particles are distributed uniformly [8].

ANOVA is used to assess the significance of machining factors on MRR and SR. S/N ratio analysis is used to find the optimal machining settings. The effects of machining parameters on SR in WEDM finish cuts and discovered that SR may be reduced by reducing both pulse on time and current. Different methods are used for improving the performance of wire electro-discharge machining by utilising pulse train features. The analysis indicates that the Taguchi technique is better suited to solving the stated problem with fewer experiments than a complete factorial design [9].

Nowadays, MMCs are widely used in industries; their higher hardness and reinforcement make conventional machining challenging, especially when complicated forms and precise components are required. Because it is easier to cut and complex forms, WEDM is the ideal choice for machining composites. The manufacturer’s machining parameters database is useful, but it is inadequate. Furthermore, it is traditional machining and does not lead to optimal and cost-effective machine use. As a result, optimizing the WEDM process parameters is unavoidable [10].

Traditional technology used to process tough composite materials produces tool wear [11]. Although in other sophisticated nonconventional machining, the equipment is expensive and the work piece height is limited. The machining parameters sometimes fail to satisfy the criteria and provide suitable guidance to production engineers. As a result, a suitable selection of WEDM process parameters is required.

WEDM provides enormous potential for diversity of application and complicated physical processes in unconventional machining techniques. Intricate and complicated forms can be machined. WEDM removes material via spark erosion all across the wire electrode and work piece. Electromachining can shape and treat electrically conductive materials. Its machining, however, varies from that of typical metallic materials. It is common knowledge that increasing the hardness of the work material during typical machining processes results in a decrease in economic cutting speed [12].

Tool materials that are extremely hard and strong to cut materials that is no longer available. Traditional techniques of producing complicated forms in such materials are still more challenging; additionally, it requires greater finish, low tolerance values, larger production rates, complex shapes, and so forth. To address all of these challenges, advanced machining techniques, also known as nontraditional machining processes, have been created. According to the research, using a magnetic field to enhance micro-EDM has a larger MRR than using one without a magnetic field [13, 14]. Adding graphite nanopowder to a dielectric fluid while utilising micro-WEDM can greatly improve the surface finish [15].

The ever-increasing need in the car industry for low weight, fuel efficiency, and comfort has resulted in the development of sophisticated lightweight composite materials with optimal design. The use of aluminium matrix composites in vehicles has the potential to improve fuel efficiency. Abrasion resistance is enhanced by the presence of hard boron carbide in the Al matrix. Similarly, the inclusion of fly ash in an Al matrix might result in a low-weight composite. Lightweight abrasion-resistant composites for wear resistance applications may be created by combining boron carbide with fly ash [16]. Hard boron carbide in the Al alloy matrix limits machinability, and standard tools are ineffective. The motivation for selecting the reinforcing mass fractions and sizes is based on the ease with which the particles may be incorporated into the matrix and castability. One of the potential technologies for efficient machining of hard particle-reinforced metal matrix composites is WEDM. The most popular Al-cast alloy used in the automobile industry is Al-Si12. As a result, an attempt was made to investigate the possibility of producing Al-Si12-reinforced with fly ash and boron carbide. The scope also includes measuring density, hardness, and WEDM machinability investigations.

2. Materials and Methods

2.1. Aluminium Alloy

Aluminium alloy (Al-Si12) has good corrosion resistance. It has the ability to be cast into thinner and more complex pieces than other form of casting alloy. Table 1 shows the composition of Al-Si12.

Table 1

Aluminium alloy (Al-Si12) chemical composition.

Constituent	Fe	Cu	Si	Mg	Ni	Ti	Zn	Mn	Al
Weight %	0.52	0.013	11.48	0.02	0.01	0.02	0.01	0.01	Remainder

2.2. Boron Carbide

Boron carbide (B₄C) particles with a diameter of 63 μm were employed as one of the reinforcing materials in this investigation. B₄C has a number of attractive characteristics, including widespread application as cermets and armour materials. Figure 1: SEM image depicting the shape of boron carbide particles.

[figure omitted; refer to PDF]

The hardness of composites was found to be greater than that of the base alloy. The addition of hard particles (B₄C and fly ash) increases the hardness of composites by increasing their resistance to plastic deformation. When reinforcement particles are added to composites, the surface area of the reinforcement is raised and the grain size of the matrix is reduced. The presence of such strong reinforcing particles on the surface prevents the material from deforming due to plastic deformation. By raising the weight percentage of reinforcement, the strength of the grain boundaries is enhanced to its extreme level, and the displacement of atoms is reduced, resulting in higher matrix strength and composite hardness.

3.4. WEDM of Hybrid Composites

The experimental results on WEDM of hybrid Al-Si12/B₄C/fly ash AMCs are presented in this section. The MRR and SR were the focus of the analysis [22]. An S/N ratio analysis was utilized to select optimal process parameters.

3.4.1. Experimental Results

The purpose of the WEDM experiments was to test the influence of process factors on output responses. Experimental results for MRR, SR, and S/N ratios are presented in Table 4.

Table 4

Experimental results of MRR and SR (Al-Si12/B₄C/fly ash).

Ex. no	$A$	$B$	$C$	$D$	$E$	MRR (mm3/min)	SR (μm)	S/N for MRR	S/N for SR
	Gap voltage (V)	Pulse on time (μs)	Pulse off time (μs)	Wire feed (m/min)	Reinforcement (wt%)
1	30	2	2	4	3	25.514	3.38	28.14	-10.58
2	30	2	6	6	6	21.423	3.06	26.62	-9.71
3	30	2	10	8	9	17.262	3.57	24.74	-11.05
4	30	6	2	6	9	33.112	3.97	30.40	-11.98
5	30	6	6	8	3	26.104	3.3	28.33	-10.37
6	30	6	10	4	6	25.705	3.51	28.20	-10.91
7	30	10	2	8	6	39.086	3.98	31.84	-12.00
8	30	10	6	4	9	31.122	3.74	29.86	-11.46
9	30	10	10	6	3	25.689	3.59	28.19	-11.10
10	50	2	2	4	3	21.058	3.3	26.47	-10.37
11	50	2	6	6	6	16.457	3.43	24.33	-10.71
12	50	2	10	8	9	13.54	4.02	22.63	-12.08
13	50	6	2	6	9	26.772	3.4	28.55	-10.63
14	50	6	6	8	3	20.165	3.66	26.09	-11.27
15	50	6	10	4	6	19.543	3.07	25.82	-9.74
16	50	10	2	8	6	31.742	3.45	30.03	-10.76
17	50	10	6	4	9	22.764	3.57	27.15	-11.05
18	50	10	10	6	3	20.549	3.59	26.26	-11.10
19	70	2	2	4	3	12.321	3.24	21.81	-10.21
20	70	2	6	6	6	9.995	3.86	20.00	-11.73
21	70	2	10	8	9	8.378	4.21	18.46	-12.49
22	70	6	2	6	9	16.365	3.97	24.28	-11.98
23	70	6	6	8	3	12.339	3.4	21.83	-10.63
24	70	6	10	4	6	11.429	3.45	21.16	-10.76
25	70	10	2	8	6	18.475	3.49	25.33	-10.86
26	70	10	6	4	9	14.489	3.65	23.22	-11.25
27	70	10	10	6	3	12.719	3.29	22.09	-10.34

3.4.2. Analysis of MRR

The S/N ratio of each variable at various values was calculated using experimental data. The special effects of S/N data process factors were displayed. Analyzing the response graphs and ANOVA tables yields the most favourable values of process variables in terms of the average performance parameters. The effect of process parameters on MRR was investigated using L₂₇ OA experiments. As seen in Figure 8, MRR increases with increasing reinforcement and pulse on time.

[figure omitted; refer to PDF]

It decreases as the gap voltage, wire feed, and pulse off time increases. The discharge energy rises as the pulse lengthens, resulting in a quicker rate of material removal. The frequency of discharges during a given period increases as the pulse off time decreases, resulting in a greater MRR. The average discharge gap widens as the gap voltage rises, resulting in a decreased MRR [23, 24]. Wire feed and reinforcement have no major effects on MRR. MRR is, likewise, evidently lowest at the low level of pulse on time and highest at the low level of pulse off time.

3.4.3. Optimal Levels for MRR

Table 5 shows the response table S/N statistics for each factor level. The significance of each element in the response is indicated by the ranks. As shown by the rankings and delta values, gap voltage has the most effect on MRR, followed by other process variables. Figure 8 depicts the maximum MRR in the WEDM process for the level 1 of gap voltage, level 3 of pulse on time, level 1 of pulse off time, and wire feed, and the level 2 of reinforcement. $F_{0.05,2,20}=3.49$ as can be shown in ANOVA Table 6, gap voltage, pulse on time, and pulse off time are all significant. The error term included the percentage reinforcement, wire feed, and the interactions of gap voltage with other process variables.

Table 5

MRR (Al-Si12/boron carbide/fly ash) response table.

Level	Gap voltage	Pulse on time	Pulse off time	Wire feed	Reinforcement
1	28.48	23.69	27.43	25.76	25.47
2	26.37	26.07	25.27	25.63	25.93
3	22.02	27.11	24.17	25.48	25.48
Delta	6.46	3.42	3.26	0.28	0.46
Rank	1	2	3	5	4

Table 6

MRR (Al-Si12/boron carbide/fly ash) ANOVA.

Source	DOF	Sum of squares	Mean sum of squares	$F$	Contribution (%)
$$A$$	2	195.37	97.69	849.43	64.60%
$$B$$	2	55.37	27.69	64.09	18.31%
$$C$$	2	49.38	24.69	57.15	16.33%
Error (pooled)	20	2.3	0.115		0.76%
Total	26	302.42			100%

3.4.4. MRR-Confirmation Experiments

The optimal parameters are employed in the confirmation experiments as well as in estimating the MRR. The outcomes of the experiments are examined in order to determine the optimal parameters. The factors at level $A_1,B_3,C_1,D_1,\text{and}{E}_2$ are shown in Figure 8 and response Table 5. The optimal parameters for getting maximum MRR are 30 V gap voltage, 10 μs pulse on time, 2 μs pulse off time, 4 m/min wire feed, and 6% reinforcement. MRR is expected to be 36.12 mm³/min, whereas the experimental measurement is 38.01 mm³/min.

3.4.5. Analysis of SR

Experiments using L₂₇ OA were carried out to examine the influence of process factors on surface roughness. Table 4 displays the experimental results of SR. For S/N data, Figure 9 illustrates the SR for all parameters at levels 1, 2, and 3. The SR is increased by increasing the gap voltage, pulse on time, pulse off time, wire feed, and reinforcing. As the pulse lengthens, the discharge energy (DE) increases, and a larger DE produces a larger crater, resulting in higher work piece surface roughness. The frequency of discharges decreases as the pulse off time increases, resulting in an improved surface finish due to stable machining.

[figure omitted; refer to PDF]

3.4.6. Selection of Optimal Levels for SR

The S/N data of each factor at each level is shown in Table 7. The outcomes of the experiments are examined to determine the best parameters. Figure 9 shows that in the WEDM process, the second level of gap voltage, pulse on time, and pulse off time, first level of wire feed, and first level of reinforcement offer the lowest SR [25]. ANOVA was used to investigate the importance of the process factors in relation to SR. $F_0.{}_{05,2,10}=4.10$ and $F_{0.05,4,10}=3.48$ are the $F$ values from the table at the 5% significance level. So, according to ANOVA Table 8, wire feed and reinforcement and the interaction of gap voltage with pulse on time are the effective parameters. The error term was made up of the gap voltage, pulse on time, pulse off time, and the interactions of gap voltage with wire feed.

Table 7

Response table for SR (Al-Si12/boron carbide/fly ash).

Level	Gap voltage	Pulse on time	Pulse off time	Wire feed	Reinforcement
1	-11.02	-10.99	-11.04	-10.70	-10.66
2	-10.86	-10.92	-10.91	-11.03	-10.80
3	-11.14	-11.10	-11.06	-11.28	-11.55
Delta	0.28	0.18	0.15	0.58	0.89
Rank	3	4	5	2	1

Table 8

ANOVA for SR (Al-Si12/boron carbide/fly ash).

Source	DOF	Sum of squares	Mean sum of squares	$F$	Contribution (%)
$$D$$	2	1.502	0.751	5.48	11.60%
$$E$$	2	4.123	2.062	15.05	31.85%
$$AB$$	4	2.682	0.671	4.89	20.72%
$$AC$$	4	1.787	0.447	3.26	13.81%
$$AE$$	4	1.481	0.370	2.70	11.44%
Error (pooled)	10	1.370	0.137		10.58%
Total	26	12.945			100%

3.4.7. Confirmation Experiments-SR

The optimal parameters are employed in the confirmation tests as well as in estimating the SR. The outcomes of the experiments are examined in order to determine the optimal parameters. The factors at level $A_2,B_2,C_2,D_1,\text{and}{E}_1$ are shown in Figure 9 and Table 7. The following settings produce the lowest SR: gap voltage of 50 V, pulse on time of 6 μs, pulse off time of 6 μs, wire feed of 4 m/min, and reinforcement of 3%. The predicted SR is 3.15 μm, while the experimental SR is 3.24 μm.

4. Conclusions

In this study, the effects of control parameters on material removal rate and surface roughness in WEDM of Al-Si12/B₄C/fly ash composites were investigated, with the following findings:

(1) The optimal factors and their levels for the maximum MRR and minimal Ra were defined. $A_1,B_3,C_1,D_1,\text{and}{E}_2$ (gap voltage 30 V, pulse on time: 10 μs and pulse off time: 2 μs, wire feed: 4 m/min, and reinforcement percentage 6%) and A₂, B₂, C₂, D₁, and E₁ (gap voltage 50 V, pulse on time: 6 μs, pulse off time 6 μs: wire speed: 4 m/min, and reinforcement percentage 3%)

(2) The most significant parameter on MRR was gap voltage (64.60%), followed by pulse on time (18.31%). The MRR increased as the pulse on time increased

(3) The reinforcement percentage is the most significant factor in surface roughness, with a contribution of 31.85%, whereas the other machining parameters have no effect. Furthermore, the Ra increased as the wire feed and pulse on time values increased; the lowest Ra values were recorded at a pulse off time of 6 μs

(4) The predicted MRR was determined to be 36.12 mm³/min, compared to 38.01 mm³/min in the experimental measurements

(5) In the WEDM of the Al-Si12/B₄C/fly ash composite in the interval of the specified machining circumstances, the predicted surface roughness is 3.15 μm, whereas the experimental measurement is 3.24 μm

(6) The Taguchi approach could be effectively utilized for optimizing machining parameters in WEDM operations

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