Speaker
Description
A numerical layer build-up procedure coupled with a moving heat flux was constructed to investigate thermal cycles and temperature distribution that result in the multi-layer deposition of an AISI 316 austenitic steel on an AISI 304 austenitic steel substrate. To simulate the DED process, the automated interface of the ABAQUS AM module was used to define element activation and heat input event data as a function of time and position. The one-way heat and material deposition toolpath used in the analysis was created with a MatLab path script. Thermal cycles created during the AM pool crystallization were predicted for two processes performed at constant heat input equal to 117.2 J/mm. In process one, a 7.8 kW three-layer AM deposition was performed at a welding speed of 33.3 mm/s. In process two, a 3.9 kW three-layer AM process was performed at a welding speed of 16.65 mm/s. Results demonstrate that at equal heat input, the combination lower power and lower welding speed produces lower peak temperatures. As lower peak temperatures generate lower residual stresses evolution, from a design point of view, the one-way heat and material deposition processing toolpath with the lower power and lower welding speed should be selected. However, if most determinant for the production of parts and components is high-deposition- rate, then, the higher power and higher welding speed situation should be used. In this case, a complementary residual stresses analysis should be performed so as not to compromise the integrity of the part or component.
| Speaker Country | Canada |
|---|---|
| Would you like to publish your paper in the special issue of BHM "Berg- und Hüttenmännische Monatshefte" | Yes |