A novel microalloying strategy for superior creep performance in LPBF Inconel 718 superalloy

Materials Research Letters 2026 Open access

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Authors: Ruizhi Chen, Lin Zhou, Huan Zhang, Xinyu Zhao, Yi Liu, Peisen Lv, Di Wu, Jinghe Xie, Fei Sun, Jingjing Liang, Lirong Liu, Jinguo Li
DOI: 10.1080/21663831.2026.2630942
Cited by: 3
References: 47

Abstract

For high-temperature service components, excellent creep performance is critical. However, oxygen embrittlement limits the creep performance of laser powder bed fusion (LPBF) IN718 alloy. This study optimized creep performance by increasing carbon content to 0.45 wt.% and adding 0.06 wt.% yttrium (Y). At 650 °C under 650 MPa and 690 MPa, the 0.06Y-HC alloy exhibited 739% and 671% longer creep life than LPBF IN718 alloy, respectively, approaching the creep performance of wrought IN718 alloy. This improvement stems from Y-induced grain boundary purification, nano-scale Y-rich oxide precipitation. This C/Y microalloying approach effectively optimizes AM superalloys for superior creep performance.

Fields of Study & Subjects

Additive Manufacturing Materials and Processes High Temperature Alloys and Creep High Entropy Alloys Studies

Publication details

Journal / source
Materials Research Letters
Publisher
Informa UK Limited
Volume
14
Issue
5
Pages
501–509
Publication date
18 February 2026
Language
EN