Strong and ductile reduced activation ferritic/martensitic steel additively manufactured by selective laser melting

Jiang, M. G.; Chen, Z. W.; Tong, J. D.; Liu, C. Y.; Xu, G.; Liao, H. B.; Wang, P.; Wang, X. Y.; Xu, M.; Lao, C. S.

doi:10.6084/m9.figshare.8306054.v1

Strong and ductile reduced activation ferritic/martensitic steel additively manufactured by selective laser melting

journal contribution

posted on 2019-06-21, 09:10 authored by M. G. Jiang, Z. W. Chen, J. D. Tong, C. Y. Liu, G. Xu, H. B. Liao, P. Wang, X. Y. Wang, M. Xu, C. S. Lao

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 ± 4.7 MPa and elongation of 16.9 ± 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.

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.