Study on W-rich M3B2 borides in a 9Cr3W3CoB heat-resistant steel
In a 9Cr3W3CoB heat-resistant steel with 150 ppm B, the evolution of W-rich M3B2 type borides during aging at temperatures of 650, 700, 750 °C for different times was investigated. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron probe microanalysis (EPMA) and sec...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-01-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878542032130X |
| _version_ | 1818920225405403136 |
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| author | Ye Liang Wei Yan Xianbo Shi Yanfen Li Quanqiang Shi Wei Wang Yiyin Shan Ke Yang |
| author_facet | Ye Liang Wei Yan Xianbo Shi Yanfen Li Quanqiang Shi Wei Wang Yiyin Shan Ke Yang |
| author_sort | Ye Liang |
| collection | DOAJ |
| description | In a 9Cr3W3CoB heat-resistant steel with 150 ppm B, the evolution of W-rich M3B2 type borides during aging at temperatures of 650, 700, 750 °C for different times was investigated. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron probe microanalysis (EPMA) and secondary ion mass spectroscopy (SIMS) were employed to characterize the morphology evolution of the W-rich M3B2 type borides. Most of B was discovered to be present in M3B2-type (M = Fe, W, Cr, V and Nb) borides which were unevenly distributed in the matrix and could not be eliminated by normal heat-treatment. However, these borides could dissolve during prolonged isothermal exposure, where the dissolution process was accelerated by increasing aging temperature. It is indicated that the W-rich M3B2 type borides are thermodynamically metastable at high temperature. Their temporary existence postpones the nucleation and growth of Laves phase and prevents B from segregating in M23C6 carbides. W-rich M3B2 type borides are not responsible for cleavage fracture initiation when they are dissolved after aging at high temperatures for 2000 h. |
| first_indexed | 2024-12-20T01:18:22Z |
| format | Article |
| id | doaj.art-c392ec8cccde46c0897dbef0b61f9878 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-20T01:18:22Z |
| publishDate | 2021-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-c392ec8cccde46c0897dbef0b61f98782022-12-21T19:58:32ZengElsevierJournal of Materials Research and Technology2238-78542021-01-0110594604Study on W-rich M3B2 borides in a 9Cr3W3CoB heat-resistant steelYe Liang0Wei Yan1Xianbo Shi2Yanfen Li3Quanqiang Shi4Wei Wang5Yiyin Shan6Ke Yang7Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Corresponding author.Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Corresponding author.In a 9Cr3W3CoB heat-resistant steel with 150 ppm B, the evolution of W-rich M3B2 type borides during aging at temperatures of 650, 700, 750 °C for different times was investigated. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron probe microanalysis (EPMA) and secondary ion mass spectroscopy (SIMS) were employed to characterize the morphology evolution of the W-rich M3B2 type borides. Most of B was discovered to be present in M3B2-type (M = Fe, W, Cr, V and Nb) borides which were unevenly distributed in the matrix and could not be eliminated by normal heat-treatment. However, these borides could dissolve during prolonged isothermal exposure, where the dissolution process was accelerated by increasing aging temperature. It is indicated that the W-rich M3B2 type borides are thermodynamically metastable at high temperature. Their temporary existence postpones the nucleation and growth of Laves phase and prevents B from segregating in M23C6 carbides. W-rich M3B2 type borides are not responsible for cleavage fracture initiation when they are dissolved after aging at high temperatures for 2000 h.http://www.sciencedirect.com/science/article/pii/S223878542032130XHeat-resistant steelBoronW-rich boridesAging |
| spellingShingle | Ye Liang Wei Yan Xianbo Shi Yanfen Li Quanqiang Shi Wei Wang Yiyin Shan Ke Yang Study on W-rich M3B2 borides in a 9Cr3W3CoB heat-resistant steel Journal of Materials Research and Technology Heat-resistant steel Boron W-rich borides Aging |
| title | Study on W-rich M3B2 borides in a 9Cr3W3CoB heat-resistant steel |
| title_full | Study on W-rich M3B2 borides in a 9Cr3W3CoB heat-resistant steel |
| title_fullStr | Study on W-rich M3B2 borides in a 9Cr3W3CoB heat-resistant steel |
| title_full_unstemmed | Study on W-rich M3B2 borides in a 9Cr3W3CoB heat-resistant steel |
| title_short | Study on W-rich M3B2 borides in a 9Cr3W3CoB heat-resistant steel |
| title_sort | study on w rich m3b2 borides in a 9cr3w3cob heat resistant steel |
| topic | Heat-resistant steel Boron W-rich borides Aging |
| url | http://www.sciencedirect.com/science/article/pii/S223878542032130X |
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