A comparative study of additive manufactured and wrought SS316L: Pre-existing dislocations and grain boundary characteristics

The additively manufactured (AM) SS316L shows superior mechanical properties compared to their conventionally manufactured (CM) counterparts. A quantitative comparison is conducted based on the pre-existing dislocations and grain boundary characteristics of AM and CM SS316L, found that the AM posses...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2022-01, Vol.833, p.142546, Article 142546
Main Authors: Wei, Fengxia, Cheng, Baisong, Kumar, Punit, Wang, Pei, Lee, Jing Jun, Seng, Hwee Leng, Cheong, Kok Heng, Lau, Kwang Boon, Tan, Cheng Cheh
Format: Article
Language:English
Subjects:
Additive manufacturing
Coincident site lattice
Comparative studies
Dislocations
Grain boundaries
Mechanical properties
Strengthening
Strengthening mechanisms
Tensile strain
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Summary:The additively manufactured (AM) SS316L shows superior mechanical properties compared to their conventionally manufactured (CM) counterparts. A quantitative comparison is conducted based on the pre-existing dislocations and grain boundary characteristics of AM and CM SS316L, found that the AM possesses more dislocations and significantly larger portion of low angle grain boundaries, resulting in different effective strengthening mechanisms. Coincident site lattice boundaries, yielding higher strength and better ductility, show much diverse distributions in the AM samples, with only very little Σ3. The AM grain boundaries show very distinct behaviors under tensile strain compared to the CM sample. This work conducted in-depth investigations on the strengthening mechanisms and shed a light on grain boundary engineering to further enhance the mechanical properties of AM materials.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2021.142546