Author Affiliations
1 School of Maritime Economics and Management, Dalian Maritime University, Dalian, Liaoning 116026, China2 College of Applied Technology, University of Science and Technology Liaoning, Anshan, Liaoning 114051, Chinashow less
Fig. 1. Schematic of laser-cutting process
Fig. 2. Exp erimental macrograph
Fig. 3. Mark graph of metallographic data of samples. (a) No. 2; (b) No. 3; (c) No. 4; (d) No. 5; (e) No. 6; (f) No. 7; (g) No. 8; (h) No. 9; (i) No. 10; (j) No. 11; (k) No. 12; (l) No. 14; (m) No. 15; (n) No. 16; (o) No. 17; (p) No. 18; (q) No. 19; (r) No. 20; (s) No. 21; (t) No. 22; (u) No. 23; (v) No. 24; (w) No. 25
Fig. 4. Four-time sampling figures of samples from No. 17 to No. 20. (a) No. 17, first sampling; (b) No. 17, second sampling; (c) No. 17, third sampling; (d) No. 17, fourth sampling; (e) No. 18, first sampling; (f) No. 18, second sampling; (g) No. 18, third sampling; (h) No. 18, fourth sampling; (i) No. 19, first sampling; (j) No. 19, second c sampling; (k) No. 19, third sampling; (l) No. 19, fourth sampling; (m) No. 20, first sampling; (n) No. 20, second sampling; (o) No. 20, third sampling; (p) No. 20
Fig. 5. Three-layer BP network
Fig. 6. Resutls predicted by BP neural network. (a) Comparison between predicted value and expected value; (b) error; (c) percentage of error
Fig. 7. Flow chart of algorithm
Fig. 8. Fitness value curve
Fig. 9. Experimental diagram for test. (a) Positive macrograph; (b) back macrograph; (c) metallographic micrograph
Composition | Ni | Cr | W | Mo | Al | Ti | Fe | B | Zr | Ce |
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Value | Bal. | 19.0-22.0 | 7.5-9.0 | 7.5-9.0 | 0.4-0.8 | 0.4-0.8 | 1.0 | 0.005 | 0.04 | 0.05 |
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Table 1. Chemical compositions of GH3128 (mass fraction,%)
Symbol | Factor | Level 1 | Level 2 | Level 3 | Level 4 | Level 0 |
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A | Electric current /A | 200 | 210 | 220 | 230 | 215 | B | Pulse width /ms | 0.8 | 1 | 1.2 | 1.4 | 1.1 | C | Cutting speed /(mm·min-1) | 150 | 200 | 250 | 300 | 225 | D | Defocusing amount /mm | -1 | -0.5 | 0.5 | 1 | 0 |
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Table 2. Factor levels
No. | Level ofABCD | S /μm | K /μm | l/L /% | Sc | No. | Level ofABCD | S /μm | K/μm | l/L /% | Sc |
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1 | 1111 | 0 | 0 | 0 | 0 | 14 | 4231 | 170 | 171.5 | 84 | 70.85 | 2 | 1222 | 155 | 177.5 | 100 | 84.5 | 15 | 4324 | 272.5 | 193 | 100 | 77.08 | 3 | 1333 | 260 | 195 | 100 | 77.5 | 16 | 4413 | 417.5 | 209.5 | 100 | 68.18 | 4 | 1444 | 262.5 | 200 | 100 | 76.88 | 17 | 0000 | 242.4 | 148.875 | 100 | 82.99 | 5 | 2123 | 157.5 | 159.5 | 100 | 86.18 | 18 | 2222 | 169.9 | 178.625 | 100 | 83.64 | 6 | 2214 | 250 | 224 | 100 | 75.1 | 19 | 3333 | 213 | 183.375 | 100 | 81.01 | 7 | 2341 | 197.5 | 171.5 | 100 | 82.98 | 20 | 4444 | 310.5 | 204.75 | 100 | 74 | 8 | 2432 | 102.5 | 262 | 100 | 78.68 | 21 | 1000 | 207.5 | 162 | 100 | 83.43 | 9 | 3134 | 132.5 | 109.5 | 80 | 73.94 | 22 | 2111 | 190 | 161.5 | 81 | 68.32 | 10 | 3243 | 172.5 | 155 | 100 | 85.88 | 23 | 3222 | 220 | 128.5 | 100 | 86.15 | 11 | 3312 | 175 | 219 | 100 | 79.35 | 24 | 4333 | 165 | 183.5 | 100 | 83.4 | 12 | 3421 | 235 | 273.5 | 100 | 70.9 | 25 | 0444 | 247.5 | 195 | 100 | 78.13 | 13 | 4142 | 0 | 0 | 0 | 0 | | | | | | |
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Table 3. Comprehensive scores of samples
No. | Sample | S /μm | K /μm | Sc | Error /% | Average |
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17 | 1 | 328 | 155 | 78.1 | -6.26 | | 82.99 | 2 | 211.5 | 162 | 83.225 | 0.28 | | | 3 | 192.5 | 133 | 87.075 | 4.69 | | | 4 | 237.5 | 145.5 | 83.575 | 0.69 | | | 18 | 1 | 179 | 181 | 82.95 | -0.83 | | 83.64 | 2 | 188 | 186 | 82 | -2 | | | 3 | 157.5 | 166.5 | 85.475 | 2.15 | | | 4 | 155 | 181 | 84.15 | 0.61 | | | 19 | 1 | 221.5 | 176 | 81.325 | 0.39 | | 81.01 | 2 | 221.5 | 176.5 | 81.275 | 0.33 | | | 3 | 221.5 | 181 | 80.825 | -0.23 | | | 4 | 187.5 | 200 | 80.625 | -0.48 | | | 20 | 1 | 326.5 | 190.5 | 74.625 | 0.84 | | 74 | 2 | 283.5 | 219 | 73.925 | -0.1 | | | 3 | 322.5 | 209.5 | 72.925 | -1.47 | | | 4 | 309.5 | 200 | 74.525 | 0.7 | | |
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Table 4. Sample errors
Number of nodes | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
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Error | 31.89 | 15.62 | 19.95 | 16.53 | 18.86 | 17.66 | 25.12 | 19.47 | 11.26 | 37.33 | 57.09 |
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Table 5. Hidden layer node errors