Additive manufacturing (AM) is playing a critical role in the areas of in-space intelligent manufacturing and on-orbital serving technologies. One of challenges is to reveal the composition-processing-microstructure-property relationship during post-treatment process, which would promote the AMed-product with excellent quality. In present work, the integration of heat and magnetic fields provides an approach to optimize microstructures and to enhance the mechanical properties of the selective laser melting (SLM) fabricated Ti–6Al–4V alloy. The conditions for post-treatment processes are set up to 400 °C for 30 min with 2 T, 4 T, 6 T, 8 T and 10 T, respectively. This coupling effects not only promote the phase transformation of α'→α+β, but also modify the width of the α'/α phases. The α'/α morphology after post-treatment becomes finer than the as-built ones, attributing to grain refinement strengthening. Moreover, the yield strength and the ductility of the annealed specimen in 8 T high magnetic field are 1092.1 MPa and 15.1% respectively, which could beat the classical reported SLM-fabricated ones and be comparable to the wrought ones. This work provides the connections between magnetic heating treatments and mechanical properties, paving a path to accelerate the development of space technology and exploration.

增材制造 (AM) 在空间智能制造和在轨服务技术领域发挥着关键作用。挑战之一是揭示后处理过程中的成分-加工-微观结构-性能关系，这将促进具有优良品质的AMed产品。在目前的工作中，热和磁场的整合提供了一种优化微观结构和提高选择性激光熔化 (SLM) 制造的 Ti-6Al-4V 合金机械性能的方法。后处理工艺的条件分别设置为 400 °C 30 分钟，分别为 2 T、4 T、6 T、8 T 和 10 T。这种耦合效应不仅促进了 α'→α+β 的相变，而且还改变了 α'/α 相的宽度。α' 后处理后的 /α 形貌变得比竣工时更精细，这归因于晶粒细化强化。此外，退火试样在 8 T 强磁场下的屈服强度和延展性分别为 1092.1 MPa 和 15.1%，可以击败经典报道的 SLM 制造试样，并与锻造试样相媲美。这项工作提供了磁加热处理与机械性能之间的联系，为加速空间技术和探索的发展铺平了道路。