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Hot Isostatic Pressing of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion
| Content Provider | MDPI |
|---|---|
| Author | Andreas, Öchsner Hafenstein, Stephan Hitzler, Leonhard Sert, Enes Merkel, Markus Werner, Ewald |
| Copyright Year | 2020 |
| Description | Hot isostatic pressing can be utilized to reduce the anisotropic mechanical properties of Al–Si–Mg alloys fabricated by laser powder-bed fusion (L-PBF). The implementation of post processing densification processes can open up new fields of application by meeting high quality requirements defined by aircraft and automotive industries. A gas pressure of 75 MPa during hot isostatic pressing lowers the critical cooling rate required to achieve a supersaturated solid solution. Direct aging uses this pressure related effect during heat treatment in modern hot isostatic presses, which offer advanced cooling capabilities, thereby avoiding the necessity of a separate solution annealing step for Al–Si–Mg cast alloys. Hot isostatic pressing, followed by rapid quenching, was applied to both sand cast as well as laser powder-bed fused Al–Si–Mg aluminum alloys. It was shown that the critical cooling rate required to achieve a supersaturated solid solution is significantly higher for additively manufactured, age-hardenable aluminum alloys than it is for comparable sand cast material. The application of hot isostatic pressing can be combined with heat treatment, consisting of solution annealing, quenching and direct aging, in order to achieve both a dense material with a small number of preferred locations for the initiation of fatigue cracks and a high material strength. |
| Starting Page | 48 |
| e-ISSN | 22277080 |
| DOI | 10.3390/technologies8030048 |
| Journal | Technologies |
| Issue Number | 3 |
| Volume Number | 8 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-09-18 |
| Access Restriction | Open |
| Subject Keyword | Technologies Manufacturing Engineering Selective Laser Melting Additive Manufacturing Fatigue Resistance Critical Cooling Rate Hip |
| Content Type | Text |
| Resource Type | Article |
