Tailoring cold spray additive manufacturing of steel 316 L for static and cyclic load-bearing applications

Materials & Design

Jan Kondas¹  Jan Cizek²  Fabrizio Perego³  Frantisek Lukac³  Stefano Monti³  Sara Bagherifard³  Frank Gaertner⁴  Mario Guagliano⁵  Ondrej Kovarik⁵ 

[1] Corresponding author.;Impact Innovations GmbH, Bürgermeister-Steinberger-Ring 1, 84431, Haun/Rattenkirchen, Germany;Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy;Faculty on Nuclear Sciences and Physical Engineering, Czech Technical University, Prague, Czech Republic;Institute of Plasma Physics of the Czech Academy of Sciences, Prague, Czech Republic;

关键词: Kinetic deposition;    3D-printing;    Freestanding;    Fatigue;    Crack propagation;   

DOI  :  

来源: DOAJ

【 摘 要 】

Thanks to the low working temperature, less product size limitations and one order of magnitude higher deposition rates compared to the established additive manufacturing techniques, more attention has been brought to the potential of cold spraying for additive manufacturing . As a process dealing with deformation of solid particles possibly leaving non-bonded interfaces and causing work hardening, any optimization should (i) adjust spray parameters to obtain high performance as-sprayed parts and (ii) tune ductility and internal stresses by post-treatments. The present study first deals with strategies to optimize spray parameters for fabrication of high performance steel 316 L deposits. Next, the performances of deposits are further adjusted by various heat treatments. The structural strength of the freestanding samples before and after the heat treatments is evaluated under static and cyclic axial loading and supported by fatigue crack growth rate analysis. The results highlight the feasibility of obtaining high quality steel 316 L deposits using N2 as process gas, rather than the costly He that is commonly suggested. This study demonstrates the potential of cold spraying to be used for deposition of freeform structural components with a static strength comparable to that of bulk and laser-based additive manufactured materials and a fatigue strength similar to that of bulk cast material.

【 授权许可】

Unknown