| Issue |
MATEC Web Conf.
Volume 401, 2024
21st International Conference on Manufacturing Research (ICMR2024)
|
|
|---|---|---|
| Article Number | 02005 | |
| Number of page(s) | 6 | |
| Section | Additive Manufacturing | |
| DOI | https://doi.org/10.1051/matecconf/202440102005 | |
| Published online | 27 August 2024 | |
Microstructure and Mechanical Properties of Crack-Free IN738G Alloy Processed by Laser Powder Bed Fusion
Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, 250061, China
* Corresponding author: liuyue@sdu.edu.cn
The IN738 nickel-based superalloy has a high Al, Ti and γ’ (Ni3 [Al, Ti]) content phase that causes notable crack sensitivity when processed by laser powder bed fusion (LPBF). After examining the effects of Ti and Co on the microstructure and mechanical properties of IN738 alloy processed by LPBF, this research revealed that a moderate decrease in Ti content and an increase in Co content resulted in a wide range of processing parameters to obtain crack-free LPBF specimens. The samples were treated by different heat-treatment processes and then investigated by scanning electron microscopy (SEM). The newly designed IN738G exhibited an excellent combination of tensile strength (1253.5 MPa) and elongation (16.37%) compared to the IN738 alloy (1115.7 MPa, 6.99%) under room-temperature conditions.
© The Authors, published by EDP Sciences, 2024
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