Nanometer-scale precipitations in a selective electron beam melted nickel-based superalloy

被引：12

作者：

Chandra, Shubham ^{[1
]}

Tan, Xipeng ^{[1
]}

Narayan, R. Lakshmi ^{[2
]}

Descoins, Marion ^{[3
]}

Mangelinck, Dominique ^{[3
]}

Tor, Shu Beng ^{[1
]}

Liu, Erjia ^{[1
]}

Seet, Gerald ^{[1
]}

机构：

[1] Nanyang Technol Univ, Singapore Ctr 3D Printing, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore

[2] Indian Inst Technol, Dept Mat Sci & Engn, New Delhi 110016, India

[3] Univ Aix Marseille, IM2NP, UMR 7334 CNRS, F-13397 Marseille 20, France

来源：

SCRIPTA MATERIALIA | 2021年 / 194卷

基金：

新加坡国家研究基金会;

关键词：

Additive manufacturing; Electron beam melting; Superalloy; Nano-scale; Precipitation;

D O I：

10.1016/j.scriptamat.2020.113661

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The nanometer-scale (nano-scale) microstructural evolution in an additively manufactured Re-free Ni-based superalloy, with single crystal compositions, is investigated through field emission scanning electron microscopy, transmission electron microscopy, and atom probe tomography. We find that nano-scale primary. gamma' precipitation occurs in the fine as-built microstructure, leading to an exceptional microhardness of 480.0 +/- 6.7 HV at room temperature. Presence of ultra-fine. gamma' precipitates, similar to 20 nm in size, is observed in the bottom few layers of the as-built samples, which is hitherto undocumented and contrary to the widespread consensus regarding hierarchical. gamma' phase evolution in additively manufactured Ni-based superalloys. Moreover, considerable precipitation of tantalum-rich C14 Laves phase at the grain boundaries and interdendritic regions in the as-built samples emphasizes the need for additive manufacturing specific alloy design. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

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