| Autor: |
Kiran A; COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany, Czech Republic., Li Y; COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany, Czech Republic., Koukolíková M; COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany, Czech Republic., Brázda M; COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany, Czech Republic., Hodek J; COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany, Czech Republic., Urbánek M; COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany, Czech Republic., Džugan J; COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany, Czech Republic., Raghavan S; Makino Asia Pte Ltd., 2 Gul Ave, Singapore 629649, Singapore., Odehnal J; Department of Material Science and Technology, University of West Bohemia, Univerzitni 2732/8, 301 00 Pilsen, Czech Republic. |
| Abstrakt: |
In the present study, the effect of material deposition at the elevated temperature baseplate on the microstructure and mechanical properties was investigated and correlated to the unique thermal history by using numerical simulation. Numerical results agreed well with the experimental results of microstructure and mechanical properties. Numerical results revealed a significant decrease in temperature gradient and a 40% decrease in thermal stress due to material deposition on the elevated temperature baseplate. The reduced thermal stress and temperature gradient resulted in coarser grain features, which in turn led to a decrease in hardness and tensile strength, especially for the bottom region near the baseplate. Meanwhile, no significant effect could be found for ductility. In addition, an elevated temperature baseplate promoted less heterogeneity in hardness and tensile properties along the building direction. The current work demonstrates a collective and direct understanding of the baseplate preheating effect on thermal stress, microstructure and mechanical properties and their correlations, which is believed beneficial for the better utilization of baseplate preheating positive effects. |
