Influence of TiN Inclusions and Segregation on the Delayed Cracking in NM450 Wear-Resistant Steel
High-strength, wear-resistant steel often suffers from delayed cracking after flame cutting. Delayed cracking can lead to extremely harmful sudden brittle fracture; therefore, it is necessary to study the formation of delayed cracking in high-strength steel. This work investigated the influence of T...
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MDPI AG
2021-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/1/21 |
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| author | Jingjing Liu Denghui Liu Xiurong Zuo Lihua Liu Qiangjun Yan |
| author_facet | Jingjing Liu Denghui Liu Xiurong Zuo Lihua Liu Qiangjun Yan |
| author_sort | Jingjing Liu |
| collection | DOAJ |
| description | High-strength, wear-resistant steel often suffers from delayed cracking after flame cutting. Delayed cracking can lead to extremely harmful sudden brittle fracture; therefore, it is necessary to study the formation of delayed cracking in high-strength steel. This work investigated the influence of TiN inclusions and segregation on the delayed cracking in NM450 wear-resistant steel by optical microscopy, scanning electron microscopy, X-ray diffraction, transmission electron microscopy and electron backscattered diffractometer methods. The results indicated that the delayed cracks originated from the segregation zones (SZs) containing multiple high-hardness segregation bands. The tensile strength of the SZ specimens was higher than that of non-segregation zone (NSZ) specimens, while the total elongation and reduction of area of the SZ specimens were relatively lower compared with the NSZ specimens. Therefore, the delayed cracking on the flame cutting surface of the NM450 steel plate was attributed to the existence of SZs that contain a high density of dislocations and considerable micro-sized TiN inclusions. |
| first_indexed | 2024-03-10T00:57:35Z |
| format | Article |
| id | doaj.art-5199e7f7cf8d4645bb5093a48bd3af60 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T00:57:35Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-5199e7f7cf8d4645bb5093a48bd3af602023-11-23T14:41:07ZengMDPI AGMetals2075-47012021-12-011212110.3390/met12010021Influence of TiN Inclusions and Segregation on the Delayed Cracking in NM450 Wear-Resistant SteelJingjing Liu0Denghui Liu1Xiurong Zuo2Lihua Liu3Qiangjun Yan4Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, ChinaKey Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, ChinaKey Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, ChinaNanjing Iron & Steel Co., Ltd., Nanjing 210035, ChinaNanjing Iron & Steel Co., Ltd., Nanjing 210035, ChinaHigh-strength, wear-resistant steel often suffers from delayed cracking after flame cutting. Delayed cracking can lead to extremely harmful sudden brittle fracture; therefore, it is necessary to study the formation of delayed cracking in high-strength steel. This work investigated the influence of TiN inclusions and segregation on the delayed cracking in NM450 wear-resistant steel by optical microscopy, scanning electron microscopy, X-ray diffraction, transmission electron microscopy and electron backscattered diffractometer methods. The results indicated that the delayed cracks originated from the segregation zones (SZs) containing multiple high-hardness segregation bands. The tensile strength of the SZ specimens was higher than that of non-segregation zone (NSZ) specimens, while the total elongation and reduction of area of the SZ specimens were relatively lower compared with the NSZ specimens. Therefore, the delayed cracking on the flame cutting surface of the NM450 steel plate was attributed to the existence of SZs that contain a high density of dislocations and considerable micro-sized TiN inclusions.https://www.mdpi.com/2075-4701/12/1/21NM450 wear-resistant steeldelayed cracksmechanical propertiessegregation zoneTiN inclusions |
| spellingShingle | Jingjing Liu Denghui Liu Xiurong Zuo Lihua Liu Qiangjun Yan Influence of TiN Inclusions and Segregation on the Delayed Cracking in NM450 Wear-Resistant Steel Metals NM450 wear-resistant steel delayed cracks mechanical properties segregation zone TiN inclusions |
| title | Influence of TiN Inclusions and Segregation on the Delayed Cracking in NM450 Wear-Resistant Steel |
| title_full | Influence of TiN Inclusions and Segregation on the Delayed Cracking in NM450 Wear-Resistant Steel |
| title_fullStr | Influence of TiN Inclusions and Segregation on the Delayed Cracking in NM450 Wear-Resistant Steel |
| title_full_unstemmed | Influence of TiN Inclusions and Segregation on the Delayed Cracking in NM450 Wear-Resistant Steel |
| title_short | Influence of TiN Inclusions and Segregation on the Delayed Cracking in NM450 Wear-Resistant Steel |
| title_sort | influence of tin inclusions and segregation on the delayed cracking in nm450 wear resistant steel |
| topic | NM450 wear-resistant steel delayed cracks mechanical properties segregation zone TiN inclusions |
| url | https://www.mdpi.com/2075-4701/12/1/21 |
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