Influence of a rescanning strategy with different laser powers on the microstructure and mechanical properties of Hastelloy X elaborated by powder bed fusion

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:803

Article

Keller, C.¹  Mokhtari, M.¹  Vieille, B.¹  Briatta, H.¹  Bernard, P.² 

[1] Normandie Univ, Grp Phys Mat, UMR 6634, CNRS, Ave Univ, F-76800 St Etienne Du Rouvray, France

[2] Foret Vernon, ArianeGrp, F-27200 Vernon, France

关键词: Additive manufacturing;    Powder bed fusion;    Superalloys;    Lasing strategy;    Mechanical properties;    Texture;   

DOI  :  10.1016/j.msea.2020.140474

来源: Elsevier

【 摘 要 】

The present study investigates the influence of a rescanning strategy on the microstructure and mechanical properties of Hastelloy X samples manufactured by laser powder bed fusion process in additive manufacturing. After a first lasing leading to powder melting, a second lasing is performed on the solid metal with five considered laser powers corresponding to 100-80-60-40 and 20% of the power of the first laser scan. The microstructure and mechanical properties of the samples obtained from these elaboration strategies were then compared to those of a conventional strategy with and without heat treatment. Using electron microscopy, monotonic and loading/unloading tensile tests, the results revealed that samples elaborated with the rescanning strategy are characterized by weaker crystallographic texture, lower backstress and larger ductility compared to conventional elaboration parameters. However, these modifications induced by the second laser scan, depend on the second laser scanning power, better properties are observed for a decrease of 40% in the laser power during the second laser scan. Such strategy may be suitable to optimize the mechanical properties but also to potentially avoid post-elaboration heat treatments.

【 授权许可】

Free