期刊
MATERIALS RESEARCH LETTERS
卷 7, 期 10, 页码 426-432出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2019.1631224
关键词
Selective laser melting; reduced activation steel; heterogeneous microstructure; strength; ductility
资金
- Shenzhen Fundamental Research Fund [JCYJ20180305123917216]
- Key Project Fund for Science and Technology Development of Guangdong Province [2017B090911014]
- China Postdoctoral Science Foundation [2018M640818]
- Shenzhen SciTech Project [JSGG20170821171139052]
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. [GRAPHICS] . 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.
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