Influence of synchronous-hammer-forging intervention temperature on the microstructure and properties of 316L components fabricated by laser directed energy deposition

[Display omitted] •12 % large plastic deformation was achieved using small hammering force of 45 N.•The microstructure achieved 71 % grain refinement and 91 % anisotropy reduction.•The yield strength and tensile strength were improved by 41 % and 10 %. Synchronous-hammer-forging has been proved to b...

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Bibliographic Details
Published in:Materials letters 2024-10, Vol.372, p.137083, Article 137083
Main Authors: Li, Yunfei, Wu, Dongjiang, Xu, Mingze, Hao, Yunbo, Zhao, Kai, Yu, Chengshui, Zheng, Jianchao, Bai, Qian, Ma, Guangyi, Niu, Fangyong
Format: Article
Language:English
Subjects:
316L
Additive manufacturing
Laser processing
Microstructure
Property
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Summary:[Display omitted] •12 % large plastic deformation was achieved using small hammering force of 45 N.•The microstructure achieved 71 % grain refinement and 91 % anisotropy reduction.•The yield strength and tensile strength were improved by 41 % and 10 %. Synchronous-hammer-forging has been proved to be an effective method to control the microstructure and properties of metal components in additive manufacturing, but the influence of the intervention temperature is still unclear. 316L stainless steel samples with different hammer-forging intervention temperature were prepared by laser directed energy deposition (LDED) technology. The results show that due to dynamic recrystallization and dislocation accumulation effect, the grain size of the component decreases first and then increases with the increase of hammer-forging temperature, while the dislocation density and tensile strength increase first and then decrease.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2024.137083