Variant Pairing of Lath Bainite and Martensite in an Ultra-High-Strength Steel
The mixed structure of lath bainite and martensite was obtained by isothermal transformation tests at 698 K, 673 K and 623 K in ultra-high-strength steel. The interweaving mode of lath bainite and martensite was revealed by colored metallography and band contrast maps based on Gaussian fit. The crys...
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MDPI AG
2022-11-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/11/1896 |
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| author | Meiying Li Shun Wang Tao Jia Xianming Zhao |
| author_facet | Meiying Li Shun Wang Tao Jia Xianming Zhao |
| author_sort | Meiying Li |
| collection | DOAJ |
| description | The mixed structure of lath bainite and martensite was obtained by isothermal transformation tests at 698 K, 673 K and 623 K in ultra-high-strength steel. The interweaving mode of lath bainite and martensite was revealed by colored metallography and band contrast maps based on Gaussian fit. The crystallographic characteristics were analyzed in terms of variant pairing. The twin-related V1/V2 variant pairs were found in the region with high band contrast (BC) values, inferred as lath bainite. While in the low-BC value region, which was inferred as lath martensite, besides the dominated twin-related V1/V2 variant pair, V1/V4 variant pairs with low-angle grain boundaries were occasionally revealed. According to the classification by Takayama et al., both variant pairings of lath bainite and martensite in this work correspond to a type II mode. The present work has confirmed, even with complex microstructure, i.e., mixed lath bainite and martensite were formed depending on the processing route, bainite and martensite still follow their own rules of variant pairing. |
| first_indexed | 2024-03-09T18:50:48Z |
| format | Article |
| id | doaj.art-553bfcc05d904415848392ed73c22af2 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T18:50:48Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-553bfcc05d904415848392ed73c22af22023-11-24T05:52:51ZengMDPI AGMetals2075-47012022-11-011211189610.3390/met12111896Variant Pairing of Lath Bainite and Martensite in an Ultra-High-Strength SteelMeiying Li0Shun Wang1Tao Jia2Xianming Zhao3The State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaThe State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaThe State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaThe State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaThe mixed structure of lath bainite and martensite was obtained by isothermal transformation tests at 698 K, 673 K and 623 K in ultra-high-strength steel. The interweaving mode of lath bainite and martensite was revealed by colored metallography and band contrast maps based on Gaussian fit. The crystallographic characteristics were analyzed in terms of variant pairing. The twin-related V1/V2 variant pairs were found in the region with high band contrast (BC) values, inferred as lath bainite. While in the low-BC value region, which was inferred as lath martensite, besides the dominated twin-related V1/V2 variant pair, V1/V4 variant pairs with low-angle grain boundaries were occasionally revealed. According to the classification by Takayama et al., both variant pairings of lath bainite and martensite in this work correspond to a type II mode. The present work has confirmed, even with complex microstructure, i.e., mixed lath bainite and martensite were formed depending on the processing route, bainite and martensite still follow their own rules of variant pairing.https://www.mdpi.com/2075-4701/12/11/1896steelsEBSDvariant selectionlath bainitelath martensite |
| spellingShingle | Meiying Li Shun Wang Tao Jia Xianming Zhao Variant Pairing of Lath Bainite and Martensite in an Ultra-High-Strength Steel Metals steels EBSD variant selection lath bainite lath martensite |
| title | Variant Pairing of Lath Bainite and Martensite in an Ultra-High-Strength Steel |
| title_full | Variant Pairing of Lath Bainite and Martensite in an Ultra-High-Strength Steel |
| title_fullStr | Variant Pairing of Lath Bainite and Martensite in an Ultra-High-Strength Steel |
| title_full_unstemmed | Variant Pairing of Lath Bainite and Martensite in an Ultra-High-Strength Steel |
| title_short | Variant Pairing of Lath Bainite and Martensite in an Ultra-High-Strength Steel |
| title_sort | variant pairing of lath bainite and martensite in an ultra high strength steel |
| topic | steels EBSD variant selection lath bainite lath martensite |
| url | https://www.mdpi.com/2075-4701/12/11/1896 |
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