期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 299, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2021.117373
关键词
Wire arc additive manufacturing; Stainless steel; Microstructure; Spatial variations
资金
- Aim2XL program [P16-46/S17024f]
- Rotterdam Fieldlab Additive Manufacturing BV (RAMLAB)
The microstructure of a thick 316LSi WAAM part was characterized in detail, revealing large and highly-oriented columnar grains with specific texture distribution and internal microstructure, correlated to the building direction and thermal gradient.
Wire arc additive manufacturing (WAAM) is a class of technologies suitable for producing large parts due to its high material deposition and building rates. Among the many possible materials processed by WAAM, austenitic stainless steels, e.g. 316L, are commonly employed. The structure of WAAM 316L thin parts has been studied extensively before. However, multiwalled or thick WAAM 316L parts remain largely unexplored. Hence, in this study, the microstructure of a thick 316LSi WAAM part is characterised in detail. The microstructure of the part consists of large and highly-oriented columnar grains dominated by epitaxial and competitive growth. The overlapping regions between neighbouring fusion zones contain long grains with a dominant 100 texture, which cross several layers and are aligned with the building direction. The grains' internal microstructure consists of an austenite matrix, ferrite with locally varying dendritic morphologies and dispersed oxide inclusions. The texture spatially varies across the part, and this variation is correlated to the local thermal gradient induced by the building strategy and processing conditions used during the manufacturing of the thick-walled part.
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