Additive manufacturing (AM) enables the processing of heterogeneous materials with customised architectures to improve strength-ductility synergy. Herein, layerwise-heterostructured high-strength steels were processed by AM of two steel powders following the designed architectures. The fabricated high-strength steels with hierarchical heterogeneous characteristics at the layer, melt-pool and grain scales, exhibit good strength-ductility combination, reaching a strength of 1.32 GPa together with an elongation of 7.5%. The increased strength attributes to hetero-deformation induced strengthening. In-situ deformation monitoring reveals many unique deformation bands in heterostructure materials, which delays necking and improves ductility. The findings demonstrate a novel potential approach to circumvent material property trade-offs.

增材制造（AM）能够使用定制的体系结构处理异质材料，以提高强度-延展性的协同作用。在此，按照设计的结构，通过两种钢粉的AM加工层状异质结构高强度钢。所制造的在层，熔池和晶粒尺度上具有分级异质性特征的高强度钢表现出良好的强度-延展性组合，达到1.32 GPa的强度以及7.5％的延伸率。强度增加归因于异形变形引起的强化。原位变形监测揭示了异质结构材料中许多独特的变形带，从而延迟了颈缩并提高了延展性。这些发现证明了一种新颖的潜在方法来规避物质财产的权衡。