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Microstructure and Mechanical Properties of Crack-Free IN738G Alloy Processed by Laser Powder Bed Fusion

Authors :
Wang Yi
Liu Yue
Han Quanquan
Source :
MATEC Web of Conferences, Vol 401, p 02005 (2024)
Publication Year :
2024
Publisher :
EDP Sciences, 2024.

Abstract

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.

Details

Language :
English, French
ISSN :
2261236X and 20244010
Volume :
401
Database :
Directory of Open Access Journals
Journal :
MATEC Web of Conferences
Publication Type :
Academic Journal
Accession number :
edsdoj.9b11564884874647a2a5c1a95a173d6d
Document Type :
article
Full Text :
https://doi.org/10.1051/matecconf/202440102005