Modeling › Thermomechanical Properties

 

Accurate thermomechanical properties are needed to predict dimensional changes associated with metal casting processes and powder metallurgy processes. The nominal casting dimensions can be achieved with reduced costs provided that the die tools were dimensioned with an appropriate degree of accuracy. As a step toward predicting tooling dimensions, it was showed that, for the investment casting of aluminum alloys and stainless steels, the alloy shrinkage factors were accurately predicted when the deformation of the mold was considered. For powder metallurgy, obtaining the elastic and inelastic properties is challenging as the material behavior changes dramatically during cold pressing and/or sintering. The thermomechanical behavior of different powder types was used to understand the non-uniform distribution of density after cold pressing and/or sintering. The elastic and inelastic properties are also very important to predict the defect formation during metal casting, such as microporosity and hot tearing. Obtaining the thermomechanical properties within the mushy zone domain is very important to understand and mitigate these casting defects. The stress evolution within both the oxide scale and metal boiler tubes is very important to understanding the exfoliation of the oxide scale that can clog the boiler tubes leading to power plant outages.

Contacts:

SABAU, Adrian S. sabaua@ornl.gov 865.241.5145
YIN, Hebi yinh1@ornl.gov 865.574.8849

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