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- Title
Mechanical Properties and Microstructure of 316 Stainless Steel Processed by Pulsed Micro-Plasma Additive Manufacturing.
- Authors
Yuan, Xiaojing; Guo, Xiaohui; Qiu, Hefang; Cui, Fanfan; Wang, Xuping; Guan, Ning; Li, Hao; Li, Jin; Zhan, Jun; Zeng, Fanqi
- Abstract
An innovative pulsed micro-plasma additive manufacturing (AM) system is proposed for fabrication of thin-walled 316 stainless steel parts. During the deposition process, the heat accumulation from the micro-plasma can be effectively controlled by adjusting the AM current, pulse length of the plasma arc, and scanning speed. The width of the pool reached 3.0 mm. Microstructural analysis, micro-hardness tests, and tensile strength tests were performed. The results of structural characterization showed that columnar dendrites predominated in the microstructure of the thin-walled elements and exhibited epitaxial growth from the bottom to the top and from the middle to both sides, while the top grains showed more variation in the growth orientation. The grains had a core–shell structure with a growth orientation along the <100> direction of the austenite structure, and the boundary was composed of migrated C and Cr. The micro-hardness of the thin-walled structure (240–320 Hv0.3) decreased with increasing deposition thickness. The tensile strength and yield strength of the thin-walled part were 669 and 475 MPa, respectively. The fracture mechanism was that cracks formed along the pores of the grain boundary and then propagated along the grain boundary, ultimately leading to fracture.
- Subjects
MICROSTRUCTURE; CRYSTAL grain boundaries; MICROHARDNESS testing; THIN-walled structures; EPITAXY; STAINLESS steel
- Publication
Journal of Thermal Spray Technology, 2022, Vol 31, Issue 3, p623
- ISSN
1059-9630
- Publication type
Article
- DOI
10.1007/s11666-022-01335-x