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Chicago Ridge, IL, United States

Cao J.,Thermal Processing Technology Center | Gharghouri M.A.,Chalk River Laboratories | Nash P.,Thermal Processing Technology Center
Journal of Materials Processing Technology | Year: 2016

A 3D transient fully coupled thermomechanical model was built to study the distortion and residual stress in electron beam additive manufactured Ti-6Al-4V build plates. Single layer, 6-layer and 11-layer build plates were investigated using both simulation and experiments to ensure the accuracy of the model and provide confidence in using simulations for process optimization. The model was validated by comparing the predicted residual elastic strains against measured values obtained by neutron diffraction for the 11-layer build plate. The longitudinal component of strain, parallel to the beam trace, is the most significant component. A double-peak tensile strain distribution was found in the cross-section of the substrate. The plate distortion was also measured for comparison with the model simulations. The simulated distortion and residual strains are in good agreement with the experimental results. The effect of preheat on the distortion and the residual stress distribution was then studied using the validated model. The modeling results show that preheating at least twice is an effective way to reduce both distortion and residual stresses. © 2016 Source

Yin M.,Thermal Processing Technology Center | Hasier J.,Thermal Processing Technology Center | Nash P.,Thermal Processing Technology Center
Journal of Materials Science | Year: 2015

The phase equilibria associated with Heusler-type intermetallic compounds have been reviewed for systems containing Fe, Co or Ni. Ternary alloy systems are identified in which the phase equilibria are not well established or completely unknown and which are therefore prime targets for additional experimental work. Other systems in which there is conflicting information regarding the existence of a Heusler phase are also identified. Design issues are highlighted in terms of phase combinations that may benefit functional properties or processing of bulk material containing Heusler compounds. © 2015 Springer Science+Business Media New York Source

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