期刊
ADDITIVE MANUFACTURING
卷 27, 期 -, 页码 345-352出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.addma.2019.03.011
关键词
Additive manufacturing simulation; Heat input modeling; Phase evolution; BMG; PBF
资金
- Swedish Foundation for Strategic Research, SSF, project Development of Process and Material in Additive Manufacturing [GMT14-0048]
- Swedish National Graduate School in Neutron Scattering (SwedNess)
One of the major challenges with the powder bed fusion process (PBF) and formation of bulk metallic glass (BMG) is the development of process parameters for a stable process and a defect-free component. The focus of this study is to predict formation of a crystalline phase in the glass forming alloy AMZ4 during PBF. The approach combines a thermal finite element model for prediction of the temperature field and a phase model for prediction of crystallization and devitrification. The challenge to simulate the complexity of the heat source has been addressed by utilizing temporal reduction in a layer-by-layer fashion by a simplified heat source model. The heat source model considers the laser power, penetration depth and hatch spacing and is represented by a volumetric heat density equation in one dimension. The phase model is developed and calibrated to DSC measurements at varying heating rates. It can predict the formation of crystalline phase during the non-isothermal process. Results indicate that a critical location for devitrification is located a few layers beneath the top surface. The peak is four layers down where the crystalline volume fraction reaches 4.8% when 50 layers are built.
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