%0 Journal Article %T Strong and ductile reduced activation ferritic/martensitic steel additively manufactured by selective laser melting %A C. S. Lao %A C. Y. Liu %A G. Xu %A H. B. Liao %A J. D. Tong %A M. G. Jiang %A M. Xu %A P. Wang %A X. Y. Wang %A Z. W. Chen %J Materials Research Letters %D 2019 %R https://doi.org/10.1080/21663831.2019.1631224 %X ABSTRACT Selective laser melting (SLM) was successfully applied to fabricate strong and ductile reduced activation ferritic/martensitic (RAFM) steel by introducing heterogeneous multi-/bimodal microstructure. The SLM-built RAFM steel exhibited an excellent combination of strength and ductility (i.e. yield strength of 1053£¿¡À£¿4.7£¿MPa and elongation of 16.9£¿¡À£¿0.4%), well surpassing the previously reported counterparts. The superior strength was expected from the refined grains and lath martensites, and the high ductility was associated with the improved dislocation-controlled strain hardening capability. This work provides a basis for developing high-performance RAFM steel by microstructural design via SLM. GRAPHICAL ABSTRACT IMPACT STATEMENT A new strategy, refers to heterogeneous multi-/bimodal microstructure, is proposed to develop strong and ductile RAFM steel via SLM and the achieved superior mechanical properties overcome the classic strength-ductility trade-off %U https://www.tandfonline.com/doi/full/10.1080/21663831.2019.1631224