The effect of powder size on laser direct deposition of 410L stainless steel
Additive Manufacturing (AM) has been quickly developed in recent years and has many advantages compared to the traditional manufacturing. Direct energy deposition (DED) is a kind of AM which melts powders with laser to build the part layer by layer. Therefore, the characteristics of the powders have...
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| Format: | Thesis-Master by Coursework |
| Language: | English |
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Nanyang Technological University
2022
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| Online Access: | https://hdl.handle.net/10356/158838 |
| _version_ | 1811682826840440832 |
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| author | Jiang, Zhuheng |
| author2 | Zhou Wei |
| author_facet | Zhou Wei Jiang, Zhuheng |
| author_sort | Jiang, Zhuheng |
| collection | NTU |
| description | Additive Manufacturing (AM) has been quickly developed in recent years and has many advantages compared to the traditional manufacturing. Direct energy deposition (DED) is a kind of AM which melts powders with laser to build the part layer by layer. Therefore, the characteristics of the powders have great influence on the printing product.
This dissertation study the effect of effect of powder size on direct energy deposition of 410L stainless steel. Two ranges of sizes of 410L stainless steel are applied. The smaller size of powder is 15-45 μm while the larger size of powder is 45~125 μm. Two powders were printed on the A36 substrate with same processing parameters. The morphology, microstructure and the microhardness were investigated.
The results show that the tracks of smaller powders better surface finish than larger powder. And the processing parameters have great influence on the size of deposition zone. If the laser power increase, the height of deposition zone will decrease while the width will increase. If the powder feeding speed increases, the height will increase significantly while the width of deposition zone will fluctuate slightly. If scanning speed increases the height will increase and the width will decrease. During the DED process, the microstructure of HAZ changed from ferrite and pearlite to lath martensite. HAZ is the hardest zone of cross-section. The microhardness of deposition zone of the larger powders is bigger than that of smaller value. The microhardness of the HAZ of the two sizes of powder is similar. |
| first_indexed | 2024-10-01T04:03:01Z |
| format | Thesis-Master by Coursework |
| id | ntu-10356/158838 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:03:01Z |
| publishDate | 2022 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1588382023-03-11T18:09:40Z The effect of powder size on laser direct deposition of 410L stainless steel Jiang, Zhuheng Zhou Wei School of Mechanical and Aerospace Engineering MWZHOU@ntu.edu.sg Engineering::Mechanical engineering::Prototyping Additive Manufacturing (AM) has been quickly developed in recent years and has many advantages compared to the traditional manufacturing. Direct energy deposition (DED) is a kind of AM which melts powders with laser to build the part layer by layer. Therefore, the characteristics of the powders have great influence on the printing product. This dissertation study the effect of effect of powder size on direct energy deposition of 410L stainless steel. Two ranges of sizes of 410L stainless steel are applied. The smaller size of powder is 15-45 μm while the larger size of powder is 45~125 μm. Two powders were printed on the A36 substrate with same processing parameters. The morphology, microstructure and the microhardness were investigated. The results show that the tracks of smaller powders better surface finish than larger powder. And the processing parameters have great influence on the size of deposition zone. If the laser power increase, the height of deposition zone will decrease while the width will increase. If the powder feeding speed increases, the height will increase significantly while the width of deposition zone will fluctuate slightly. If scanning speed increases the height will increase and the width will decrease. During the DED process, the microstructure of HAZ changed from ferrite and pearlite to lath martensite. HAZ is the hardest zone of cross-section. The microhardness of deposition zone of the larger powders is bigger than that of smaller value. The microhardness of the HAZ of the two sizes of powder is similar. Master of Science (Smart Manufacturing) 2022-05-27T01:16:00Z 2022-05-27T01:16:00Z 2022 Thesis-Master by Coursework Jiang, Z. (2022). The effect of powder size on laser direct deposition of 410L stainless steel. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/158838 https://hdl.handle.net/10356/158838 en application/pdf Nanyang Technological University |
| spellingShingle | Engineering::Mechanical engineering::Prototyping Jiang, Zhuheng The effect of powder size on laser direct deposition of 410L stainless steel |
| title | The effect of powder size on laser direct deposition of 410L stainless steel |
| title_full | The effect of powder size on laser direct deposition of 410L stainless steel |
| title_fullStr | The effect of powder size on laser direct deposition of 410L stainless steel |
| title_full_unstemmed | The effect of powder size on laser direct deposition of 410L stainless steel |
| title_short | The effect of powder size on laser direct deposition of 410L stainless steel |
| title_sort | effect of powder size on laser direct deposition of 410l stainless steel |
| topic | Engineering::Mechanical engineering::Prototyping |
| url | https://hdl.handle.net/10356/158838 |
| work_keys_str_mv | AT jiangzhuheng theeffectofpowdersizeonlaserdirectdepositionof410lstainlesssteel AT jiangzhuheng effectofpowdersizeonlaserdirectdepositionof410lstainlesssteel |