Stir Casting Process Analysis and Optimization for Better Properties in Al-MWCNT-GR-Based Hybrid Composites
Abstract
:1. Introduction
2. Materials and Experimental Set-up
2.1. Materials
2.2. Powder Morphology Studies
2.3. Experimental Set-Up
Response Measurements and Characterization
2.4. Hybrid Optimization Approach
3. Results
3.1. Response: Hardness
3.2. Response: Wear Rate
3.3. Multiple-Objective Optimization for the Stir Casting Process
3.3.1. CRITIC
3.3.2. Multi-Objective Optimization: Taguchi-CRITIC-GRA
3.3.3. Multi-Objective Optimization: Taguchi-CRITIC-MOORA
3.4. Summary Results of Multiobjective Optimization
Microhardness Indentation Images
4. Wear Track and Wear Debris Analysis
5. Conclusions
- Taguchi L16 experiments were conducted and collected the experimental output (hardness and wear rate) data. Percent reinforcement of graphene showed the highest effect, whereas die temperature has the least effect on both hardness and wear rate. The optimal factor levels for hardness were found equal to PR3DT2MT4SS2 (percent reinforcement of graphene: 3%, die temperature: 180 °C, melt temperature: 770 °C, stir speed: 520 rpm), whereas PR3DT2MT3SS2 (percent reinforcement of graphene: 3%, die temperature: 180 °C, melt temperature: 740 °C, stir speed: 520 rpm) are the optimal conditions for wear rate.
- SEM analysis of MWCNT resulted in elongated tube-like curl structure and flake-like irregularly shaped structure obtained for graphene nanoparticles. EDS analysis confirms the composition of graphene and carbon nanotube particles.
- The weights corresponding to hardness and wear rate determined viz. CRITIC method were found equal to 0.4752 and 0.5428, respectively. This indicates that the weight fraction for the hardness of stir casting composites is 47.52% and 54.28% for wear rate, respectively.
- Hybrid optimization approaches such as Taguchi-CRITIC-GRA and Taguchi-CRITIC-MOORA determined the optimal factors, and levels were found equal to PR3DT2MT4SS2 and PR3DT2MT3SS2, respectively. Percent reinforcement of graphene is the most dominant effect, followed by melt temperature on the hybrid composites. The Taguchi-CRITIC-MOORA method performs marginally better than Taguchi-CRITIC-GRA in determining optimal conditions (percent reinforcement: 3 wt.%, die temperature: 180 °C, melt temperature: 740 °C, and stir speed: 520 rpm) that could improve the hardness and wear resistance properties with a value equal to the hardness of 112 and wear rate of 1.84 × 10−3 mm3/min. The Taguchi-CRITIC-MOORA method resulted in a 31.77% increase in hardness and a 36.33% decrease in wear rate compared to initial stir casting (percent reinforcement: 1 wt.%, die temperature: 140 °C, melt temperature: 680 °C, and stir speed: 480 rpm) conditions.
- The optimal condition determined viz. the Taguchi-CRITIC-MOORA method ensures a dense microstructure with minimal pores (compared to initial and average conditions) resulting in enhanced properties in composite material.
- The worn-out surface of optimal conditions resulted in a few thin and slender grooves between wear tracks compared to average and initial conditions. Furthermore, less crack propagation on the wear-out surface shows better lubricant formation and causes self-lubrication composites.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Nomenclature
MWCNT | Multiwall carbon nano-tube |
GR | Graphene |
CRITIC | Criteria importance through intercriteria correlation |
MOORA | Multi-objective optimization on the basis of ratio analysis |
TOPSIS | Technique for order preference by similarity to ideal solution |
GRA | Grey relational analysis |
MMCs | Metal matrix composites |
PR | Percent reinforcement |
DT | Die temperature |
MT | Melt temperature |
SS | Stir speed |
OL | Optimal level |
SSD | Sum of squares of differences |
PC | Percent contribution |
ANOVA | Analysis of variance |
GRC | Grey relational coefficient |
GRG | Grey relational grading |
WGRG | Weighted grey relational grading |
Cj | Criterion information |
Wj | Objective weights |
SD | Standard deviation |
SFL | Sum at factor levels |
S/N ratio | Signal-to-noise ratio |
HV | Hardness value |
WR | Wear rate |
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Control Variables | Units | Range (1, 2, 3, 4) |
---|---|---|
Percent reinforcement, PR | 1, 2, 3 & 4 | |
Die temperature, DT | °C | 140, 180, 220 & 260 |
Melt temperature, MT | °C | 680, 710, 740 & 770 |
Stir speed, SS | rpm | 480, 520, 560, 600 |
Exp. No. | Designation | Control Variables | Output Variables | S/N Ratio (dB) | |||||
---|---|---|---|---|---|---|---|---|---|
PR, % | DT, °C | MT, °C | SS, rpm | HV | WR (×10−3), mm3/min | HV | WR | ||
E1 | PR1DT1MT1SS1 | 1 | 140 | 680 | 480 | 85 | 2.89 | 38.59 | −9.22 |
E2 | PR1DT2MT2SS2 | 1 | 180 | 710 | 520 | 88 | 2.76 | 38.89 | −8.82 |
E3 | PR1DT3MT3SS3 | 1 | 220 | 740 | 560 | 91 | 2.59 | 39.18 | −8.27 |
E4 | PR1DT4MT4SS4 | 1 | 260 | 770 | 600 | 87 | 2.84 | 38.79 | −9.07 |
E5 | PR2DT1MT2SS3 | 2 | 140 | 710 | 560 | 90 | 2.63 | 39.08 | −8.4 |
E6 | PR2DT2MT1SS4 | 2 | 180 | 680 | 600 | 92 | 2.47 | 39.28 | −7.85 |
E7 | PR2DT3MT4SS1 | 2 | 220 | 770 | 480 | 90 | 2.68 | 39.08 | −8.56 |
E8 | PR2DT4MT3SS2 | 2 | 260 | 740 | 520 | 93 | 2.38 | 39.37 | −7.53 |
E9 | PR3DT1MT3SS4 | 3 | 140 | 740 | 600 | 98 | 2.26 | 39.82 | −7.08 |
E10 | PR3DT2MT4SS3 | 3 | 180 | 770 | 560 | 104 | 2.05 | 40.34 | −6.24 |
E11 | PR3DT3MT1SS2 | 3 | 220 | 680 | 520 | 101 | 2.14 | 40.09 | −6.61 |
E12 | PR3DT4MT2SS1 | 3 | 260 | 710 | 480 | 94 | 2.26 | 39.46 | −7.08 |
E13 | PR4DT1MT4SS2 | 4 | 140 | 770 | 520 | 96 | 2.17 | 39.65 | −6.73 |
E14 | PR4DT2MT3SS1 | 4 | 180 | 740 | 480 | 94 | 2.22 | 39.46 | −6.93 |
E15 | PR4DT3MT2SS4 | 4 | 220 | 710 | 600 | 92 | 2.51 | 39.28 | −7.99 |
E16 | PR4DT4MT1SS3 | 4 | 260 | 680 | 560 | 92 | 2.55 | 39.28 | −8.13 |
Factors | Levels | PR | DT | MT | SS | Total |
---|---|---|---|---|---|---|
SFL | 1 | 155.45 | 157.14 | 157.24 | 156.59 | 629.4 |
2 | 156.81 | 157.97 | 156.71 | 158.00 | ||
3 | 159.71 | 157.63 | 157.83 | 157.88 | ||
4 | 157.67 | 156.90 | 157.86 | 157.17 | ||
SSD | 38.24 | 2.78 | 3.59 | 5.20 | 49.80 | |
PC | 76.77 | 5.58 | 7.22 | 10.43 | 100 |
Factors | Levels | PR | DT | MT | SS | Total |
---|---|---|---|---|---|---|
SFL | 1 | −35.38 | −31.43 | −31.81 | −31.79 | −124.5 |
2 | −32.34 | −29.84 | −32.29 | −29.69 | ||
3 | −27.01 | −31.43 | −29.81 | −31.04 | ||
4 | −29.78 | −31.81 | −30.6 | −31.99 | ||
SSD | 153.30 | 9.23 | 15.33 | 13.03 | 190.87 | |
PC | 80.31 | 4.83 | 8.03 | 6.83 | 100 |
Exp. No. | Hardness | Wear Rate |
---|---|---|
E1 | 0.0000 | 0.0000 |
E2 | 0.1579 | 0.1548 |
E3 | 0.3158 | 0.3571 |
E4 | 0.1053 | 0.0595 |
E5 | 0.2632 | 0.3095 |
E6 | 0.3684 | 0.5000 |
E7 | 0.2632 | 0.2500 |
E8 | 0.4211 | 0.6071 |
E9 | 0.6842 | 0.7500 |
E10 | 1.0000 | 1.0000 |
E11 | 0.8421 | 0.8929 |
E12 | 0.4737 | 0.7500 |
E13 | 0.5789 | 0.8571 |
E14 | 0.4737 | 0.7976 |
E15 | 0.3684 | 0.4524 |
E16 | 0.3684 | 0.4048 |
SD | 0.2617 | 0.3108 |
Responses | Hardness | Wear Rate |
---|---|---|
Hardness | 1.0000 | 0.9333 |
Wear rate | 0.9333 | 1.0000 |
Responses | Hardness | Wear Rate | Summation |
---|---|---|---|
Hardness | 0.0000 | 0.0677 | 0.0677 |
Wear rate | 0.0667 | 0.0000 | 0.0677 |
Responses | Cj | Wj |
---|---|---|
Hardness | 0.017462 | 0.457118 |
Wear rate | 0.020738 | 0.542883 |
Exp. No. | S/N ratio | Normalization | GRC | GRG | |||
---|---|---|---|---|---|---|---|
HV | WR | HV | WR | HV | WR | ||
E1 | 38.59 | −9.22 | 0.000 ‡ | 0.000 | 0.333 ‡ | 0.333 | 0.333 ‡ |
E2 | 38.89 | −8.82 | 0.171 | 0.134 | 0.376 | 0.366 | 0.371 |
E3 | 39.18 | −8.27 | 0.337 | 0.319 | 0.430 | 0.423 | 0.426 |
E4 | 38.79 | −9.07 | 0.114 | 0.050 | 0.361 | 0.345 | 0.352 |
E5 | 39.08 | −8.4 | 0.280 | 0.275 | 0.410 | 0.408 | 0.409 |
E6 | 39.28 | −7.85 | 0.394 | 0.460 | 0.452 | 0.481 | 0.468 |
E7 | 39.08 | −8.56 | 0.280 | 0.221 | 0.410 | 0.391 | 0.400 |
E8 | 39.37 | −7.53 | 0.446 | 0.567 | 0.474 | 0.536 | 0.508 |
E9 | 39.82 | −7.08 | 0.703 | 0.718 | 0.627 | 0.639 | 0.634 |
E10 | 40.34 | −6.24 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 |
E11 | 40.09 | −6.61 | 0.857 | 0.876 | 0.778 | 0.801 | 0.790 |
E12 | 39.46 | −7.08 | 0.497 | 0.718 | 0.499 | 0.639 | 0.575 |
E13 | 39.65 | −6.73 | 0.606 | 0.836 | 0.559 | 0.753 | 0.664 |
E14 | 39.46 | −6.93 | 0.497 | 0.768 | 0.499 | 0.683 | 0.599 |
E15 | 39.28 | −7.99 | 0.394 | 0.413 | 0.452 | 0.460 | 0.456 |
E16 | 39.28 | −8.13 | 0.394 | 0.366 | 0.452 | 0.441 | 0.446 |
Max. | 40.34 | −6.24 | |||||
Min. | 38.59 | −9.22 | |||||
‡ | Normalization computation: (38.59 − 38.59)/(40.34 − 38.59) = 0.000 | ||||||
‡ | Computation of GRC: [0 + (0.5 × 1)]/[(1 − 0.000) + 0.5] = 0.333 | ||||||
‡ | Computation of WGRG: [(0.333 × 0.4572) + (0.333 × 0.5428)] = 0.333 |
Factors | Levels | PR | DT | MT | SS | Total |
---|---|---|---|---|---|---|
SFL | 1 | 1.482 | 2.04 | 2.037 | 1.907 | 8.431 |
2 | 1.785 | 2.438 | 1.811 | 2.333 | ||
3 | 2.999 | 2.072 | 2.167 | 2.281 | ||
4 | 2.165 | 1.881 | 2.416 | 1.91 | ||
SSD | 5.17 | 0.66 | 0.77 | 0.64 | 7.25 | |
PC | 71.36 | 9.18 | 10.57 | 8.84 | 100 |
Exp. No. | S/N Ratio | Sum of Squares | Normalization | Weighted Normalization | MOORA Index | ||||
---|---|---|---|---|---|---|---|---|---|
HV | WR | HV | WR | HV | WR | HV | WR | ||
E1 | 38.59 | −9.22 | 1489.2 ‡ | 85.0 | 0.000 ‡ | 0.000 | 0.333 ‡ | 0.333 | 0.333 ‡ |
E2 | 38.89 | −8.82 | 1512.4 | 77.8 | 0.171 | 0.134 | 0.376 | 0.366 | 0.371 |
E3 | 39.18 | −8.27 | 1535.1 | 68.4 | 0.337 | 0.319 | 0.430 | 0.423 | 0.426 |
E4 | 38.79 | −9.07 | 1504.7 | 82.3 | 0.114 | 0.050 | 0.361 | 0.345 | 0.352 |
E5 | 39.08 | −8.4 | 1527.2 | 70.6 | 0.280 | 0.275 | 0.410 | 0.408 | 0.409 |
E6 | 39.28 | −7.85 | 1542.9 | 61.6 | 0.394 | 0.460 | 0.452 | 0.481 | 0.468 |
E7 | 39.08 | −8.56 | 1527.2 | 73.3 | 0.280 | 0.221 | 0.410 | 0.391 | 0.400 |
E8 | 39.37 | −7.53 | 1550.0 | 56.7 | 0.446 | 0.567 | 0.474 | 0.536 | 0.508 |
E9 | 39.82 | −7.08 | 1585.6 | 50.1 | 0.703 | 0.718 | 0.627 | 0.639 | 0.634 |
E10 | 40.34 | −6.24 | 1627.3 | 38.9 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 |
E11 | 40.09 | −6.61 | 1607.2 | 43.7 | 0.857 | 0.876 | 0.778 | 0.801 | 0.790 |
E12 | 39.46 | −7.08 | 1557.1 | 50.1 | 0.497 | 0.718 | 0.499 | 0.639 | 0.575 |
E13 | 39.65 | −6.73 | 1572.1 | 45.3 | 0.606 | 0.836 | 0.559 | 0.753 | 0.664 |
E14 | 39.46 | −6.93 | 1557.1 | 48.0 | 0.497 | 0.768 | 0.499 | 0.683 | 0.599 |
E15 | 39.28 | −7.99 | 1542.9 | 63.8 | 0.394 | 0.413 | 0.452 | 0.460 | 0.456 |
E16 | 39.28 | −8.13 | 1542.9 | 66.1 | 0.394 | 0.366 | 0.452 | 0.441 | 0.446 |
‡ | Sum of squares: 38.59 × 38.59 = 1489.2 | ||||||||
‡ | Normalization value for HV: S/N ratio/√(Total sum of squares) = 38.59/√ (1489.2 + … 1542.9) = 0.245 | ||||||||
‡ | Computation of weighted normalization: 0.112 × 0.4572 = 0.112 | ||||||||
‡ | Computation of MOORA Index: 0.112 − 0.160 = −0.048 |
Factors | Levels | PR | DT | MT | SS | Total |
---|---|---|---|---|---|---|
SFL | 1 | −0.161 | −0.088 | −0.095 | −0.096 | −0.327 |
2 | −0.105 | −0.058 | −0.104 | −0.055 | ||
3 | −0.004 | −0.086 | −0.057 | −0.079 | ||
4 | −0.057 | −0.095 | −0.071 | −0.097 | ||
SSD | 0.0539 | 0.0032 | 0.0056 | 0.0046 | 0.06733 | |
PC | 80.08 | 4.73 | 8.31 | 6.88 | 100 |
Models | Optimal Factor Levels | Experimental Output Values | Percent Improvement |
---|---|---|---|
Initial Condition | PR1DT1MT1SS1 | HV = 85; WR = 2.89 × 10−3 mm3/min | |
Taguchi-CRITIC- GRA | PR3DT2MT4SS2 | HV = 108; WR = 1.95 × 10−3 mm3/min | 27.06% increase in HV; 32.53% decrease in WR |
Taguchi-CRITIC- MOORA | PR3DT2MT3SS2 | HV = 112; WR = 1.84 × 10−3 mm3/min | 31.77% increase in HV; 36.33% decrease in WR |
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Shivalingaiah, K.; Nagarajaiah, V.; Selvan, C.P.; Kariappa, S.T.; Chandrashekarappa, N.G.; Lakshmikanthan, A.; Chandrashekarappa, M.P.G.; Linul, E. Stir Casting Process Analysis and Optimization for Better Properties in Al-MWCNT-GR-Based Hybrid Composites. Metals 2022, 12, 1297. https://doi.org/10.3390/met12081297
Shivalingaiah K, Nagarajaiah V, Selvan CP, Kariappa ST, Chandrashekarappa NG, Lakshmikanthan A, Chandrashekarappa MPG, Linul E. Stir Casting Process Analysis and Optimization for Better Properties in Al-MWCNT-GR-Based Hybrid Composites. Metals. 2022; 12(8):1297. https://doi.org/10.3390/met12081297
Chicago/Turabian StyleShivalingaiah, Kanchiraya, Vinayaka Nagarajaiah, Chithirai Pon Selvan, Smitha Thothera Kariappa, Nandini Gowdru Chandrashekarappa, Avinash Lakshmikanthan, Manjunath Patel Gowdru Chandrashekarappa, and Emanoil Linul. 2022. "Stir Casting Process Analysis and Optimization for Better Properties in Al-MWCNT-GR-Based Hybrid Composites" Metals 12, no. 8: 1297. https://doi.org/10.3390/met12081297