Strengthening and Embrittling Mechanism of Super 304H Steel during Long-Term Aging at 650 °C
Super 304H has been a crucial material for ultra-supercritical boilers. However, the relationship between microstructure evolution, strengthening mechanism, and embrittling behavior during long-term aging was lacking investigation. This investigation aimed to reveal the strengthening and embrittling...
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MDPI AG
2024-02-01
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| Online Access: | https://www.mdpi.com/1996-1944/17/3/740 |
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| author | Yue Wu Fufangzhuo Chai Junjian Liu Jiaqing Wang Yong Li Chengchao Du |
| author_facet | Yue Wu Fufangzhuo Chai Junjian Liu Jiaqing Wang Yong Li Chengchao Du |
| author_sort | Yue Wu |
| collection | DOAJ |
| description | Super 304H has been a crucial material for ultra-supercritical boilers. However, the relationship between microstructure evolution, strengthening mechanism, and embrittling behavior during long-term aging was lacking investigation. This investigation aimed to reveal the strengthening and embrittling mechanism from precipitates in Super 304H. The results showed that the hardness increment came from the grain boundary’s M<sub>23</sub>C<sub>6</sub> (GB’s M<sub>23</sub>C<sub>6</sub>) and intragranular nano Cu-rich particles. After being aged for 5000 h, the GB’s M<sub>23</sub>C<sub>6</sub> and nano Cu-rich particles provided a hardness increment of approximately 10 HV and 30 HV, respectively. The impact toughness gradually decreased from 213 J/cm<sup>2</sup> to 161 J/cm<sup>2</sup> with the extending aging time. For the aged Super 304H, the GB’s M<sub>23</sub>C<sub>6</sub> provided a higher cracking source. In addition, the nano Cu-rich particle restricted the twin-induced plastic deformation of austenitic grain and depressed the absorbed energy from austenitic grain deformation. |
| first_indexed | 2024-03-08T03:52:35Z |
| format | Article |
| id | doaj.art-4819239ada36413fba36dfcdb6fb47f3 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T03:52:35Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4819239ada36413fba36dfcdb6fb47f32024-02-09T15:17:57ZengMDPI AGMaterials1996-19442024-02-0117374010.3390/ma17030740Strengthening and Embrittling Mechanism of Super 304H Steel during Long-Term Aging at 650 °CYue Wu0Fufangzhuo Chai1Junjian Liu2Jiaqing Wang3Yong Li4Chengchao Du5Datang Boiler Pressure Vessel Inspection Center Co., Ltd., Hefei 230088, ChinaSchool of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, ChinaDatang Boiler Pressure Vessel Inspection Center Co., Ltd., Hefei 230088, ChinaDatang Boiler Pressure Vessel Inspection Center Co., Ltd., Hefei 230088, ChinaDatang Boiler Pressure Vessel Inspection Center Co., Ltd., Hefei 230088, ChinaSchool of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, ChinaSuper 304H has been a crucial material for ultra-supercritical boilers. However, the relationship between microstructure evolution, strengthening mechanism, and embrittling behavior during long-term aging was lacking investigation. This investigation aimed to reveal the strengthening and embrittling mechanism from precipitates in Super 304H. The results showed that the hardness increment came from the grain boundary’s M<sub>23</sub>C<sub>6</sub> (GB’s M<sub>23</sub>C<sub>6</sub>) and intragranular nano Cu-rich particles. After being aged for 5000 h, the GB’s M<sub>23</sub>C<sub>6</sub> and nano Cu-rich particles provided a hardness increment of approximately 10 HV and 30 HV, respectively. The impact toughness gradually decreased from 213 J/cm<sup>2</sup> to 161 J/cm<sup>2</sup> with the extending aging time. For the aged Super 304H, the GB’s M<sub>23</sub>C<sub>6</sub> provided a higher cracking source. In addition, the nano Cu-rich particle restricted the twin-induced plastic deformation of austenitic grain and depressed the absorbed energy from austenitic grain deformation.https://www.mdpi.com/1996-1944/17/3/740super 304Haging treatmentprecipitatehardnessimpact toughness |
| spellingShingle | Yue Wu Fufangzhuo Chai Junjian Liu Jiaqing Wang Yong Li Chengchao Du Strengthening and Embrittling Mechanism of Super 304H Steel during Long-Term Aging at 650 °C Materials super 304H aging treatment precipitate hardness impact toughness |
| title | Strengthening and Embrittling Mechanism of Super 304H Steel during Long-Term Aging at 650 °C |
| title_full | Strengthening and Embrittling Mechanism of Super 304H Steel during Long-Term Aging at 650 °C |
| title_fullStr | Strengthening and Embrittling Mechanism of Super 304H Steel during Long-Term Aging at 650 °C |
| title_full_unstemmed | Strengthening and Embrittling Mechanism of Super 304H Steel during Long-Term Aging at 650 °C |
| title_short | Strengthening and Embrittling Mechanism of Super 304H Steel during Long-Term Aging at 650 °C |
| title_sort | strengthening and embrittling mechanism of super 304h steel during long term aging at 650 °c |
| topic | super 304H aging treatment precipitate hardness impact toughness |
| url | https://www.mdpi.com/1996-1944/17/3/740 |
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