Study on nitrogen pores, microstructure, and mechanical properties of nickel-free high-nitrogen stainless steel fabricated via LDED regulated by heat input
The most significant challenges in the laser additive manufacturing of high-nitrogen steel are nitrogen loss and nitrogen pores, which significantly impact the microstructure and mechanical properties of the fabricated parts. In this paper, the regulation mechanisms of nitrogen loss, nitrogen pores,...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2025-12-01
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| Series: | Virtual and Physical Prototyping |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/17452759.2024.2445711 |
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| author | Chaojing Yu Dabin Zhang Zuguo Liu Dongsheng Wu Yinliang Zhong Jiazhu Wu |
| author_facet | Chaojing Yu Dabin Zhang Zuguo Liu Dongsheng Wu Yinliang Zhong Jiazhu Wu |
| author_sort | Chaojing Yu |
| collection | DOAJ |
| description | The most significant challenges in the laser additive manufacturing of high-nitrogen steel are nitrogen loss and nitrogen pores, which significantly impact the microstructure and mechanical properties of the fabricated parts. In this paper, the regulation mechanisms of nitrogen loss, nitrogen pores, microstructure, and mechanical properties in the laser-directed energy deposition of nickel-free high-nitrogen stainless steel were systematically investigated. The results indicate that nitrogen loss gradually increases, and the porosity of the deposited samples first increases and then decreases with the increase in heat input. These changes are the result of the combined effects of the temperature, lifetime, solidification rate, and Marangoni flow of the melt pool. The microstructure of the deposited samples is primarily composed of austenite and ferrite phases. The deposited samples exhibit the highest mechanical properties at a moderate heat input of 80 J/mm. Furthermore, the contribution of solid-solution strengthening, grain-boundary strengthening, and dislocation strengthening to the strength of the deposited samples is discussed. |
| format | Article |
| id | doaj-art-db2cd0f9752946e6b0bc3aa9bd967e58 |
| institution | Kabale University |
| issn | 1745-2759 1745-2767 |
| language | English |
| publishDate | 2025-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Virtual and Physical Prototyping |
| spelling | doaj-art-db2cd0f9752946e6b0bc3aa9bd967e582025-01-05T18:23:16ZengTaylor & Francis GroupVirtual and Physical Prototyping1745-27591745-27672025-12-0120110.1080/17452759.2024.2445711Study on nitrogen pores, microstructure, and mechanical properties of nickel-free high-nitrogen stainless steel fabricated via LDED regulated by heat inputChaojing Yu0Dabin Zhang1Zuguo Liu2Dongsheng Wu3Yinliang Zhong4Jiazhu Wu5School of Mechanical Engineering, Guizhou University, Guiyang, People’s Republic of ChinaSchool of Mechanical Engineering, Guizhou University, Guiyang, People’s Republic of ChinaSchool of Mechanical Engineering, Guizhou University, Guiyang, People’s Republic of ChinaJoining and Welding Research Institute (JWRI), Osaka University, Osaka, JapanDepartment of Brewing Engineering Automation, Moutai Institute, Renhuai, People’s Republic of ChinaSchool of Mechanical Engineering, Guizhou University, Guiyang, People’s Republic of ChinaThe most significant challenges in the laser additive manufacturing of high-nitrogen steel are nitrogen loss and nitrogen pores, which significantly impact the microstructure and mechanical properties of the fabricated parts. In this paper, the regulation mechanisms of nitrogen loss, nitrogen pores, microstructure, and mechanical properties in the laser-directed energy deposition of nickel-free high-nitrogen stainless steel were systematically investigated. The results indicate that nitrogen loss gradually increases, and the porosity of the deposited samples first increases and then decreases with the increase in heat input. These changes are the result of the combined effects of the temperature, lifetime, solidification rate, and Marangoni flow of the melt pool. The microstructure of the deposited samples is primarily composed of austenite and ferrite phases. The deposited samples exhibit the highest mechanical properties at a moderate heat input of 80 J/mm. Furthermore, the contribution of solid-solution strengthening, grain-boundary strengthening, and dislocation strengthening to the strength of the deposited samples is discussed.https://www.tandfonline.com/doi/10.1080/17452759.2024.2445711Nickel-free high-nitrogen stainless steellaser-directed energy depositionnitrogen behaviourmicrostructure and mechanical propertiesenhancement mechanism of the mechanical properties |
| spellingShingle | Chaojing Yu Dabin Zhang Zuguo Liu Dongsheng Wu Yinliang Zhong Jiazhu Wu Study on nitrogen pores, microstructure, and mechanical properties of nickel-free high-nitrogen stainless steel fabricated via LDED regulated by heat input Virtual and Physical Prototyping Nickel-free high-nitrogen stainless steel laser-directed energy deposition nitrogen behaviour microstructure and mechanical properties enhancement mechanism of the mechanical properties |
| title | Study on nitrogen pores, microstructure, and mechanical properties of nickel-free high-nitrogen stainless steel fabricated via LDED regulated by heat input |
| title_full | Study on nitrogen pores, microstructure, and mechanical properties of nickel-free high-nitrogen stainless steel fabricated via LDED regulated by heat input |
| title_fullStr | Study on nitrogen pores, microstructure, and mechanical properties of nickel-free high-nitrogen stainless steel fabricated via LDED regulated by heat input |
| title_full_unstemmed | Study on nitrogen pores, microstructure, and mechanical properties of nickel-free high-nitrogen stainless steel fabricated via LDED regulated by heat input |
| title_short | Study on nitrogen pores, microstructure, and mechanical properties of nickel-free high-nitrogen stainless steel fabricated via LDED regulated by heat input |
| title_sort | study on nitrogen pores microstructure and mechanical properties of nickel free high nitrogen stainless steel fabricated via lded regulated by heat input |
| topic | Nickel-free high-nitrogen stainless steel laser-directed energy deposition nitrogen behaviour microstructure and mechanical properties enhancement mechanism of the mechanical properties |
| url | https://www.tandfonline.com/doi/10.1080/17452759.2024.2445711 |
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