Preparation method of WC-Co/316L γ-ray shielding composites by alternating deposition
γ-rays with strong penetrating ability are prevalent in the nuclear industry scenario,and they can easily cause a circuit system failure in intelligent equipment like robots.Traditional y-shielding materials,such as tungsten,lead,and others,cannot simultaneously consider processability,radiation shielding performance,and structural and mechanical properties.However,simultaneously meeting the optimal design goals for structural bearing capacity,shielding function,and economy is challenging.Therefore,using 316L stainless steel as the matrix and WC-Co as a function-structure enhancement material,this paper proposes a new fabrication method for WC-Co/316L function-structure-integrated γ-ray shielding composites based on directional energy deposition-additive manufacturing technology.First,the alternating deposition process of WC-Co/316L and 316L powder is studied.Subsequently,WC-Co/316L function-structure-integrated y-ray shielding composites are prepared by optimizing the laser power,scanning speed,and powder ratio.Further,the microstructure and macroscopic mechanical properties of the prepared composites are characterized.Finally,the γ-ray shielding properties of the WC-Co/316L composites with different thicknesses,WC-Co contents,and deposition methods are analyzed using Monte Carlo particle transport simulation.The results show that the low-energy γ-ray shielding rate of the composite is considerably improved.During the fabrication of WC-Co/316L composites,their nucleation rate is increased and grain is refined,substantially improving their tensile strength.This study can provide guidance for preparing function-structure-integrated y-ray shielding materials.
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