Hydrogen Embrittlement of Inconel 718 Manufactured by Laser Powder Bed Fusion Using Sustainable Feedstock: Effect of Heat Treatment and Microstructural Anisotropy

被引：11

作者：

Mohandas, Naveen Karuthodi ^{[1
]}

Giorgini, Alex ^{[2
]}

Vanazzi, Matteo ^{[2
]}

Riemslag, Ton ^{[1
]}

Scott, Sean Paul ^{[1
]}

Popovich, Vera ^{[1
]}

机构：

[1] Delft Univ Technol, Dept Mat Sci & Engn, Mekelweg 2, NL-2628 CD Delft, Netherlands

[2] F3nice, Via Roccoli 252, I-23010 Piantedo, SO, Italy

来源：

METALS | 2023年 / 13卷 / 02期

关键词：

Inconel; 718; hydrogen embrittlement; additive manufacturing; recycled powder; laser powder bed fusion; anisotropy; MECHANICAL-PROPERTIES; CRACK INITIATION; PRECIPITATION; SENSITIVITY; EVOLUTION; BEHAVIOR; REUSE; PHASE;

D O I：

10.3390/met13020418

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigated the in-situ gaseous (under 150 bar) hydrogen embrittlement behaviour of additively manufactured (AM) Inconel 718 produced from sustainable feedstock. Here, sustainable feedstock refers to the Inconel 718 powder produced by vacuum induction melting inert gas atomisation of failed printed parts or waste from CNC machining. All Inconel 718 samples, namely AM-as-processed, AM-heat-treated and conventional samples showed severe hydrogen embrittlement. Additionally, it was found that despite its higher yield strength (1462 +/- 8 MPa) and the presence of delta phase, heat-treated AM Inconel 718 demonstrates 64% lower degree of hydrogen embrittlement compared to the wrought counterpart (Y.S. 1069 +/- 4 MPa). This was linked to the anisotropic microstructure induced by the AM process, which was found to cause directional embrittlement unlike the wrought samples showing isotropic embrittlement. In conclusion, this study shows that AM Inconel 718 produced from recycled feedstock shows better hydrogen embrittlement resistance compared to the wrought sample. Furthermore, the unique anisotropic properties, seen in this study for Inconel 718 manufactured by laser powder bed fusion, could be considered further in component design to help minimise the degree of hydrogen embrittlement.

引用

页数：21

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