Additive manufacturing of multi-scale heterostructured high-strength steels

Materials Research Letters

Youxiang Chew¹  Chaolin Tan¹  Guijun Bi¹  Fern Lan Ng¹  Zhenglin Du¹  Fei Weng¹  Shang Sui¹  Ranxi Duan² 

[1] Singapore Institute of Manufacturing Technology, A*STAR;Southern University of Science and Technology;

关键词: laser aided additive manufacturing;    heterogeneous materials;    multi-material;    deformation behaviour;    architectures;   

DOI  :  10.1080/21663831.2021.1904299

来源: DOAJ

【 摘 要 】

Additive manufacturing (AM) enables the processing of heterogeneous materials with customised architectures to improve strength-ductility synergy. Herein, layerwise-heterostructured high-strength steels were processed by AM of two steel powders following the designed architectures. The fabricated high-strength steels with hierarchical heterogeneous characteristics at the layer, melt-pool and grain scales, exhibit good strength-ductility combination, reaching a strength of 1.32 GPa together with an elongation of 7.5%. The increased strength attributes to hetero-deformation induced strengthening. In-situ deformation monitoring reveals many unique deformation bands in heterostructure materials, which delays necking and improves ductility. The findings demonstrate a novel potential approach to circumvent material property trade-offs.

【 授权许可】

Unknown