Strong and ductile reduced activation ferritic/martensitic steel additively manufactured by selective laser melting. Issue 10 (3rd October 2019)

• Record Type: Journal Article
• Authors: 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.
• Is Part Of: Materials research letters. Volume 7:Issue 10(2019)
• Page Start: 426
• Page End: 432
• Publication Date: 2019-10-03
• Subjects: Selective laser melting -- reduced activation steel -- heterogeneous microstructure -- strength -- ductility; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2019.1631224
• Languages: English
• ISSNs: 2166-3831

Abstract

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 ± 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. 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.