Study on Mechanical Properties, Microstructure Evolution, and Fire Resistance Mechanism of 0.4Mo Refractory Steel at Different Temperatures.
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| Title: | Study on Mechanical Properties, Microstructure Evolution, and Fire Resistance Mechanism of 0.4Mo Refractory Steel at Different Temperatures. |
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| Authors: | Zhang, Huanhuan1 (AUTHOR), Cao, Yuxi1 (AUTHOR), Jia, Yuanhai2 (AUTHOR), Zhang, Junfen2 (AUTHOR), Lin, Dashuai2 (AUTHOR), Yin, Shubiao1 (AUTHOR) yinshubiao@kust.edu.cn |
| Source: | Steel Research International. Jul2025, Vol. 96 Issue 7, p1-9. 9p. |
| Subjects: | Optical microscopes, Heat treatment, Scanning electron microscopes, Steel bars, Steel fracture |
| Abstract: | Herein, the mechanical properties of 0.4Mo refractory steel bars at various temperatures are studied. The yield strength of the steel bar at 600 °C and below for 15 minutes is more than 2/3 (286 MPa) of the yield strength at room temperature, and the yield strength at 600 °C is 296 MPa. The strength of the test steel decreased as the temperature increased. The microstructure of tempered and quenched samples was observed by optical microscope and scanning electron microscope. The initial microstructure of the experimental steel consisted of ferrite and granular bainite. As the temperature increased, the bainite gradually dissolved. At 700 °C, the ferrite grains coarsened, and the granular bainite became finer and more dispersed. The original microstructure contained a high density of dislocations, which became entangled under stress, preventing the failure of the steel bars. Molybdenum carbides hindered the migration and annihilation of dislocations at high temperatures and served as nucleation sites to promote grain refinement. High‐temperature confocal microscopy observed the changes in the microstructure and second‐phase particles from room temperature to 1300 °C, with a heating rate of 60 °C/s. The austenitizing temperature of the experimental steel was ≈950 °C, and the precipitated phase gradually grew and dissolved as the temperature increased. [ABSTRACT FROM AUTHOR] |
| Copyright of Steel Research International is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 186342705 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Study on Mechanical Properties, Microstructure Evolution, and Fire Resistance Mechanism of 0.4Mo Refractory Steel at Different Temperatures. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Huanhuan%22">Zhang, Huanhuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cao%2C+Yuxi%22">Cao, Yuxi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jia%2C+Yuanhai%22">Jia, Yuanhai</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Junfen%22">Zhang, Junfen</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lin%2C+Dashuai%22">Lin, Dashuai</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yin%2C+Shubiao%22">Yin, Shubiao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yinshubiao@kust.edu.cn</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Steel+Research+International%22">Steel Research International</searchLink>. Jul2025, Vol. 96 Issue 7, p1-9. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Optical+microscopes%22">Optical microscopes</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+treatment%22">Heat treatment</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+electron+microscopes%22">Scanning electron microscopes</searchLink><br /><searchLink fieldCode="DE" term="%22Steel+bars%22">Steel bars</searchLink><br /><searchLink fieldCode="DE" term="%22Steel+fracture%22">Steel fracture</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Herein, the mechanical properties of 0.4Mo refractory steel bars at various temperatures are studied. The yield strength of the steel bar at 600 °C and below for 15 minutes is more than 2/3 (286 MPa) of the yield strength at room temperature, and the yield strength at 600 °C is 296 MPa. The strength of the test steel decreased as the temperature increased. The microstructure of tempered and quenched samples was observed by optical microscope and scanning electron microscope. The initial microstructure of the experimental steel consisted of ferrite and granular bainite. As the temperature increased, the bainite gradually dissolved. At 700 °C, the ferrite grains coarsened, and the granular bainite became finer and more dispersed. The original microstructure contained a high density of dislocations, which became entangled under stress, preventing the failure of the steel bars. Molybdenum carbides hindered the migration and annihilation of dislocations at high temperatures and served as nucleation sites to promote grain refinement. High‐temperature confocal microscopy observed the changes in the microstructure and second‐phase particles from room temperature to 1300 °C, with a heating rate of 60 °C/s. The austenitizing temperature of the experimental steel was ≈950 °C, and the precipitated phase gradually grew and dissolved as the temperature increased. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Steel Research International is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/srin.202400762 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 1 Subjects: – SubjectFull: Optical microscopes Type: general – SubjectFull: Heat treatment Type: general – SubjectFull: Scanning electron microscopes Type: general – SubjectFull: Steel bars Type: general – SubjectFull: Steel fracture Type: general Titles: – TitleFull: Study on Mechanical Properties, Microstructure Evolution, and Fire Resistance Mechanism of 0.4Mo Refractory Steel at Different Temperatures. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhang, Huanhuan – PersonEntity: Name: NameFull: Cao, Yuxi – PersonEntity: Name: NameFull: Jia, Yuanhai – PersonEntity: Name: NameFull: Zhang, Junfen – PersonEntity: Name: NameFull: Lin, Dashuai – PersonEntity: Name: NameFull: Yin, Shubiao IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 16113683 Numbering: – Type: volume Value: 96 – Type: issue Value: 7 Titles: – TitleFull: Steel Research International Type: main |
| ResultId | 1 |
