Anisotropy-eliminated full-dense additive manufacturing stainless steel and a preparation method thereof

Abstract

The application discloses a kind of anisotropy elimination additive manufacturing full-dense stainless steel and its preparation method, comprising, by the multi-process synergistic process of powder mixing-selective laser cladding-gradient heat treatment-pulse hot isostatic pressing treatment, realize the synchronous optimization of material microstructure and mechanical property.Innovatively, the solidification behavior of molten pool is regulated by high-entropy alloy elements, and the mechanical property is greatly improved by adding nano ceramic particles.Combined with gradient heat treatment to eliminate grain preferred orientation, combined with pulse hot isostatic pressing to eliminate internal defects, finally obtain components with high density (≥99.8%) and isotropic mechanical properties.The strength difference of the samples perpendicular and parallel to the construction direction is less than 1.5%, and the elongation deviation is less than 2%.The method has the characteristics of strong process controllability, high product consistency, etc., and is suitable for batch production of complex structural parts in the fields of aerospace, medical devices, etc.

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