Table 3.
Material properties of Inconel 625 [39,52,53], processability check, and calculation of the VED and surface energy density (SED) values and related variation ranges. DOE, design of experiment; t.b.d., to be determined.
| Material Properties | ||||||
|---|---|---|---|---|---|---|
| Rbulk | 0.70 (70%) | |||||
| k (W·m−1·K−1) | 9.8 | |||||
| α (K−1) | 15 × 10−6 | |||||
| Tm (K) | 1623 | |||||
| c (J·kg−1·K−1) | 410 | |||||
| lf (J·kg−1) | 227 × 103 | |||||
| ρ (kg·mm−3) | 8.44 × 10−6 | |||||
| Technical Specifications | ||||||
| Laser spot diameter (μm) | 55 | |||||
| Processability check | ||||||
| Optical processability check | Rbulk < 0.95 | verified | ||||
| Thermal processability check | TP = 490 (W·m−1·K−1) | verified | ||||
| Calculation of the VED | ||||||
| Calculation of q (J·mm−3) | 6.58 | |||||
| Estimate of ƞ | 0.10 (10%) | |||||
| VED (J·mm−3) | 64 | |||||
| Calculation of the SED | ||||||
| SED (J·mm−2) | 3.5 | |||||
| Parameter Optimization | ||||||
| VEDmin | VEDmedium | VEDmax | SEDmin | SEDmedium | SEDmax | |
| (J·mm−3) | (J·mm−3) | (J·mm−3) | (J·mm−2) | (J·mm−2) | (J·mm−2) | |
| CORE BULK DOE | 49 | 64 | 83 | |||
| SUPPORTS DOE | 2.9 | 3.5 | 4.2 | |||
| DOWNSKIN DOE | 27 | 32 | 38 | |||
| UPSKIN DOE | 42 | 51 | 61 | |||
| BOUNDARY DOE | SEDmedium −80% | t.b.d. based on CORE BULK DOE | SEDmedium +80% | |||
| THIN WALL DOE | ||||||
| Core parameters | VEDmedium −15% | t.b.d. based on CORE BULK DOE | VEDmedium +15% | |||
| Boundary parameters | SEDmedium −15% | t.b.d. based on BOUNDARY DOE | SEDmedium +15% | |||
| PLATE TEMPERATURE Jobs | ||||||
| Calculation of Thigh | ||||||
| Calculation of temperatures to be tested | ||||||