Thermal Analysis for Simulation of Metal Additive Manufacturing Process Considering Temperature- and History-Dependent Material Properties

2020 ◽  
Author(s):  
Seon Ho Jeong ◽  
Eun Gyo Park ◽  
Jae Won Kang ◽  
Jin Yeon Cho ◽  
Jeong Ho Kim ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Additive Manufacturing ◽  
Material Properties ◽  
Manufacturing Process ◽  
Metal Additive Manufacturing ◽  
Metal Additive

Effect of Time Spacing and Hatch Spacing on Thermal Material Properties and Melt Pool Geometry in Additive Manufacturing of S316L

2019 ◽  
Author(s):  
Elham Mirkoohi ◽  
Daniel E. Sievers ◽  
Steven Y. Liang
Keyword(s):  
Heat Transfer ◽  
Additive Manufacturing ◽  
Material Properties ◽  
Metal Additive Manufacturing ◽  
Melt Pool ◽  
Experimental Values ◽  
Melt Pool Size ◽  
Transfer Mechanisms ◽  
Hatch Spacing ◽  
Metal Additive

Abstract A physics-based analytical solution is proposed in order to investigate the effect of hatch spacing and time spacing (which is the time delay between two consecutive irradiations) on thermal material properties and melt pool geometry in metal additive manufacturing processes. A three-dimensional moving point heat source approach is used in order to predict the thermal behavior of the material in additive manufacturing process. The thermal material properties are considered to be temperature dependent since the existence of the steep temperature gradient has a substantial influence on the magnitude of the thermal conductivity and specific heat, and as a result, it has an influence on the heat transfer mechanisms. Moreover, the melting/solidification phase change is considered using the modified heat capacity since it has an influence on melt pool geometry. The proposed analytical model also considers the multi-layer aspect of metal additive manufacturing since the thermal interaction of the successive layers has an influence on heat transfer mechanisms. Temperature modeling in metal additive manufacturing is one of the most important predictions since the presence of the temperature gradient inside the build part affect the melt pool size and geometry, thermal stress, residual stress, and part distortion. In this paper, the effect of time spacing and hatch spacing on thermal material properties and melt pool geometry is investigated. Both factors are found statistically significant with regard to their influence on thermal material properties and melt pool geometry. The predicted melt pool size is compared to experimental values from independent reports. Good agreement is achieved between the proposed physics-based analytical model and experimental values.

scholarly journals Multi-metal additive manufacturing process chain for optical quality mold generation

2020 ◽  
Vol 277 ◽  
pp. 116451 ◽  
Author(s):  
F.G. Biondani ◽  
G. Bissacco ◽  
S. Mohanty ◽  
P.T. Tang ◽  
Hans Nørgaard Hansen
Keyword(s):  
Additive Manufacturing ◽  
Manufacturing Process ◽  
Optical Quality ◽  
Process Chain ◽  
Metal Additive Manufacturing ◽  
Manufacturing Process Chain ◽  
Metal Additive

scholarly journals Analytical Thermal Modeling of Powder Bed Metal Additive Manufacturing Considering Powder Size Variation and Packing

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1988 ◽  
Author(s):  
Jinqiang Ning ◽  
Wenjia Wang ◽  
Xuan Ning ◽  
Daniel E. Sievers ◽  
Hamid Garmestani ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Additive Manufacturing ◽  
Heat Loss ◽  
Powder Material ◽  
Material Properties ◽  
Powder Size ◽  
Temperature Prediction ◽  
Powder Bed ◽  
Metal Additive Manufacturing ◽  
Metal Additive

This work presents a computationally efficient predictive model based on solid heat transfer for temperature profiles in powder bed metal additive manufacturing (PBMAM) considering the heat transfer boundary condition and powder material properties. A point moving heat source model is used for the three-dimensional temperature prediction in an absolute coordinate. The heat loss from convection and radiation is calculated using a heat sink solution with a mathematically discretized boundary considering non-uniform temperatures and heat loss at the boundary. Powder material properties are calculated considering powder size statistical distribution and powder packing. The spatially uniform and temperature-independent material properties are employed in the temperature prediction. The presented model was tested in PBMAM of AlSi10Mg under different process conditions. The calculations of material properties are needed for AlSi10Mg because of the significant difference in thermal conductivity between powder form and solid bulk form. Close agreement is observed upon experimental validation on the molten pool dimensions.

scholarly journals Scaling Up metal additive manufacturing process to fabricate molds for composite manufacturing

2020 ◽  
Vol 32 ◽  
pp. 101093 ◽  
Author(s):  
Ahmed Arabi Hassen ◽  
Mark Noakes ◽  
Peeyush Nandwana ◽  
Seokpum Kim ◽  
Vlastimil Kunc ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Manufacturing Process ◽  
Scaling Up ◽  
Composite Manufacturing ◽  
Metal Additive Manufacturing ◽  
Metal Additive
Sign in / Sign up

Export Citation Format

Share Document