期刊论文详细信息
Additive Manufacturing Letters
Revealing the true partitioning character of zirconium in additively manufactured polycrystalline superalloys
Stoichko Antonov1  Muriel Veron2  Guilhem Martin3  Charlotte Mayer3  Catherine Tassin4  Jean-Jacques Blandin4  Arthur Després4  Paraskevas Kontis4  Edgar F. Rauch4 
[1] Corresponding author.;Aubert et Duval, Usine des Ancizes, Rue des villas, BP1, Les Ancizes 63770, France;Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Strasse 1, Düsseldorf 40237, Germany;Univ. Grenoble Alpes, CNRS, Grenoble INP, SIMaP, F-38000 Grenoble, France;
关键词: Additive manufacturing;    Nickel-based superalloys;    Phase transformation;    TEM;    APT;   
DOI  :  
来源: DOAJ
【 摘 要 】

Minor addition of zirconium is common in polycrystalline nickel-based superalloys, where it is believed that it segregates at grain boundaries and contributes to increase the creep resistance. However, in superalloys produced by additive manufacturing, zirconium may become detrimental as it promotes hot-cracking during the fabrication stage. Here, we clarify the controversial role of this element by studying its distribution at near atomic scale in the as-built and heat-treated microstructures. In the as-built microstructure, zirconium is almost exclusively found at grain boundaries. However, after heat-treatment, zirconium is no longer found at grain boundaries. Instead, it partitions in γʹ precipitates and zirconium oxides particles. The formation of zirconia is shown to originate from the reduction of nano-particles of alumina by zirconium during heat-treatment. The absence of zirconium at grain boundaries in this state challenges the classic view often reported in the literature for superalloys.

【 授权许可】

Unknown   

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