Effects of Carbon Content on the Properties of Novel Nitrogen-Free Austenitic Stainless Steel with High Hardness Prepared via Metal Injection Molding
A novel nitrogen-free austenitic stainless steel with a hardness of >200 HV was developed using metal injection molding (MIM), and the effects of graphite addition on the sintering behavior, mechanical properties, and corrosion resistance of heat-treated samples were investigated. The results sho...
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| Format: | Article |
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MDPI AG
2023-02-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/2/403 |
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| author | Xin Luo Jia Lou Hao He Chu Wu Yuhang Huang Na Su Shibo Li |
| author_facet | Xin Luo Jia Lou Hao He Chu Wu Yuhang Huang Na Su Shibo Li |
| author_sort | Xin Luo |
| collection | DOAJ |
| description | A novel nitrogen-free austenitic stainless steel with a hardness of >200 HV was developed using metal injection molding (MIM), and the effects of graphite addition on the sintering behavior, mechanical properties, and corrosion resistance of heat-treated samples were investigated. The results show that a certain amount of graphite addition increases the relative density to >98%. In samples with the addition of 0–500 ppm graphite, large grain-boundary precipitates reduced corrosion resistance and ductility. In contrast, when graphite addition was increased to 750–1500 ppm, fine precipitates, which exhibited coherent lattice relationships with the matrix, were uniformly distributed within the grain and grain boundaries; this significantly improved the mechanical properties and corrosion resistance. The tensile strength and elongation intervals were 546.94–608.62 MPa and 29.68–24.63%, respectively. To prevent overburning, samples with a graphite content higher than 3000 ppm were sintered at a lower temperature, resulting in a higher porosity and lower performance. |
| first_indexed | 2024-03-11T08:25:16Z |
| format | Article |
| id | doaj.art-83f924aeb7c643dcacb13b5fb02e8f84 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T08:25:16Z |
| publishDate | 2023-02-01 |
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| series | Metals |
| spelling | doaj.art-83f924aeb7c643dcacb13b5fb02e8f842023-11-16T22:08:49ZengMDPI AGMetals2075-47012023-02-0113240310.3390/met13020403Effects of Carbon Content on the Properties of Novel Nitrogen-Free Austenitic Stainless Steel with High Hardness Prepared via Metal Injection MoldingXin Luo0Jia Lou1Hao He2Chu Wu3Yuhang Huang4Na Su5Shibo Li6School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, ChinaSchool of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, ChinaSchool of Microelectronics and Materials Engineering, Guangxi University of Science and Technology, Liuzhou 545006, ChinaHunan Hengji Powder Technology Co., Ltd., Yueyang 414517, ChinaSchool of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, ChinaSchool of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, ChinaSchool of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, ChinaA novel nitrogen-free austenitic stainless steel with a hardness of >200 HV was developed using metal injection molding (MIM), and the effects of graphite addition on the sintering behavior, mechanical properties, and corrosion resistance of heat-treated samples were investigated. The results show that a certain amount of graphite addition increases the relative density to >98%. In samples with the addition of 0–500 ppm graphite, large grain-boundary precipitates reduced corrosion resistance and ductility. In contrast, when graphite addition was increased to 750–1500 ppm, fine precipitates, which exhibited coherent lattice relationships with the matrix, were uniformly distributed within the grain and grain boundaries; this significantly improved the mechanical properties and corrosion resistance. The tensile strength and elongation intervals were 546.94–608.62 MPa and 29.68–24.63%, respectively. To prevent overburning, samples with a graphite content higher than 3000 ppm were sintered at a lower temperature, resulting in a higher porosity and lower performance.https://www.mdpi.com/2075-4701/13/2/403stainless steelmetal injection moldinggraphite additionmechanical propertiescorrosion resistance |
| spellingShingle | Xin Luo Jia Lou Hao He Chu Wu Yuhang Huang Na Su Shibo Li Effects of Carbon Content on the Properties of Novel Nitrogen-Free Austenitic Stainless Steel with High Hardness Prepared via Metal Injection Molding Metals stainless steel metal injection molding graphite addition mechanical properties corrosion resistance |
| title | Effects of Carbon Content on the Properties of Novel Nitrogen-Free Austenitic Stainless Steel with High Hardness Prepared via Metal Injection Molding |
| title_full | Effects of Carbon Content on the Properties of Novel Nitrogen-Free Austenitic Stainless Steel with High Hardness Prepared via Metal Injection Molding |
| title_fullStr | Effects of Carbon Content on the Properties of Novel Nitrogen-Free Austenitic Stainless Steel with High Hardness Prepared via Metal Injection Molding |
| title_full_unstemmed | Effects of Carbon Content on the Properties of Novel Nitrogen-Free Austenitic Stainless Steel with High Hardness Prepared via Metal Injection Molding |
| title_short | Effects of Carbon Content on the Properties of Novel Nitrogen-Free Austenitic Stainless Steel with High Hardness Prepared via Metal Injection Molding |
| title_sort | effects of carbon content on the properties of novel nitrogen free austenitic stainless steel with high hardness prepared via metal injection molding |
| topic | stainless steel metal injection molding graphite addition mechanical properties corrosion resistance |
| url | https://www.mdpi.com/2075-4701/13/2/403 |
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