Tab. 1.
Post-manufacture heat treatment and shot peening conditions
| Sample | Material | Heat treatment parameters | Shot Peening parameters | |||||
|---|---|---|---|---|---|---|---|---|
| Solution treatment | Ageing | |||||||
| Temperature [°C] | Time [min] | Temperature [°C] | Time [min] | Working pressure [MPa] | Time [min] | Medium | ||
| RP | Conventional | - | - | - | - | - | - | - |
| RD | DMLS | - | - | - | - | - | - | - |
| STP | Conventional | 1040 | 40 | - | - | - | - | - |
| STD | DMLS | 1040 | 40 | - | - | - | - | - |
| PHP | Conventional | 1040 | 40 | 450 | 240 | - | - | - |
| PHD | DMLS | 1040 | 40 | 450 | 240 | - | - | - |
| PHPG | Conventional | 1040 | 40 | 450 | 240 | 0.4 | 2 | Glass |
| PHDG | DMLS | 1040 | 40 | 450 | 240 | 0.4 | 2 | Glass |
| PHPS | Conventional | 1040 | 40 | 450 | 240 | 0.4 | 2 | Steel |
| PHDS | DMLS | 1040 | 40 | 450 | 240 | 0.4 | 2 | Steel |
| PHPC | Conventional | 1040 | 40 | 450 | 240 | 0.4 | 2 | Ceramic |
| PHDC | DMLS | 1040 | 40 | 450 | 240 | 0.4 | 2 | Ceramic |
Tab. 2.
Chemical composition of reference 17-4PH after DMLS fabrication
| Element | C | Cr | Ni | Cu | Mn | Si | Mo | Nb | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|
| RD as-manufactrued | Wt. [%] | 0.04 | 15.95 | 4.72 | 4.6 | 0.69 | 0.71 | 0.12 | 0.26 | Bal. |
| GP1 powder (EOS declaration) | <0.07 | 15-17.5 | 3-5 | 3-5 | <1 | <1 | <0.5 | 0.15-0.45 | Bal. | |
| ASTM A564 | <0.07 | 15-17.5 | 3-5 | 3-5 | <1 | 1 | <0.5 | 0.15-0.45 | Bal. | |
| EN10088-1 | <0.07 | 15-17 | 3-5 | 3-5 | <1.5 | <0.7 | <0.6 | 5*C-0.45 | Bal. | |
Fig. 1.
a) RP topographic mode, b) RD c) PHPG, d) PHDG, e) PHPS, f) PHDS topographic mode - SEM micrographs
Fig. 2.
g) PHPC, h) PHPC - SEM micrographs
Fig. 3.
SEM-EDS spot analysis after SP process a) PHPG, b) PHDG c) PHPS, d) PHDS, e) PHPC, f) PHDC
Fig. 4.
Vickers hardness (HV0.2) of specimen’s top surfaces
Fig. 5.
Comparison of Ra roughness parameters of 17-4PH steel
Fig. 6.
Comparison of Rq roughness parameters of 17-4PH steel
Fig. 7.
Comparison of Rt roughness parameters of 17-4PH steel
Fig. 8.
Characteristic of the surface- 2D map of the surface of the investigated materials and surface features: a) RP, b) RD, c) STP, d) STD, e) PHP, f) PHD, g) PHPG, h) PHDG, i) PHPS, j) PHDS, k) PHPC, l) PHDC
Fig. 9.
Characteristic of the surface- 2D map of the surface of the investi-gated materials and surface features: g) PHPG, h) PHDG, i) PHPS, j) PHDS, k) PHPC, l) PHDC
Fig. 10.
Potentiodynamic polarization curves in 3.5% NaCl solution – Tafel plot
Fig. 11.
Corrosion resistance parameters Icorr - Corrosion current density
Fig. 12.
Corrosion resistance parameters Ecorr - Corrosion potential
Fig. 13.
Corrosion resistance parameters Epit - Critical Pitting Potential
Fig. 14.
Corrosion resistance parameters-Corrosion rate