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Effect of Interrupted Quenching on the Microstructure, Mechanical Properties and Dislocation Density of Steel AISI 4340.

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Title: Effect of Interrupted Quenching on the Microstructure, Mechanical Properties and Dislocation Density of Steel AISI 4340.
Authors: Nalcaci, Burak1 (AUTHOR) buraknalcaci@gazi.edu.tr, Aydin, Omer Cihad2 (AUTHOR), Yilmaz, Salih3 (AUTHOR), Kilicli, Volkan1 (AUTHOR)
Source: Metal Science & Heat Treatment. Nov2025, Vol. 67 Issue 7/8, p623-632. 10p.
Subjects: Microstructure, Dislocation density, Martensitic transformations, Vickers hardness, Martensite, Chromium molybdenum steel, Mechanical behavior of materials, Bainite
Abstract: The effect of interrupted quenching on the microstructure, mechanical properties and dislocation density of steel AISI 4340 is studied. Metallographic and x-ray diffraction analyses are performed. Tensile tests are conducted. The Vickers hardness is measured. The dislocation density is calculated. The effect of the duration of the hold at 300°C during the interrupted quenching on the structure and properties of the steel is considered. It is shown that a duplex structure represented chiefly by martensite and bainite forms after interrupted quenching by all the variants studied. The duplex structure affects positively the properties of steel AISI 4340. The dislocation density, the ultimate strength and the hardness are the highest in the steel containing 34.7% bainite, 55% martensite and 10.3% retained austenite after the interrupted quenching at 300°C with a 5-min hold. [ABSTRACT FROM AUTHOR]
Copyright of Metal Science & Heat Treatment is the property of Springer Nature 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.)
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  Data: Effect of Interrupted Quenching on the Microstructure, Mechanical Properties and Dislocation Density of Steel AISI 4340.
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  Data: <searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+density%22">Dislocation density</searchLink><br /><searchLink fieldCode="DE" term="%22Martensitic+transformations%22">Martensitic transformations</searchLink><br /><searchLink fieldCode="DE" term="%22Vickers+hardness%22">Vickers hardness</searchLink><br /><searchLink fieldCode="DE" term="%22Martensite%22">Martensite</searchLink><br /><searchLink fieldCode="DE" term="%22Chromium+molybdenum+steel%22">Chromium molybdenum steel</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Bainite%22">Bainite</searchLink>
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  Data: The effect of interrupted quenching on the microstructure, mechanical properties and dislocation density of steel AISI 4340 is studied. Metallographic and x-ray diffraction analyses are performed. Tensile tests are conducted. The Vickers hardness is measured. The dislocation density is calculated. The effect of the duration of the hold at 300°C during the interrupted quenching on the structure and properties of the steel is considered. It is shown that a duplex structure represented chiefly by martensite and bainite forms after interrupted quenching by all the variants studied. The duplex structure affects positively the properties of steel AISI 4340. The dislocation density, the ultimate strength and the hardness are the highest in the steel containing 34.7% bainite, 55% martensite and 10.3% retained austenite after the interrupted quenching at 300°C with a 5-min hold. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Metal Science & Heat Treatment is the property of Springer Nature 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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        Value: 10.1007/s11041-023-00843-z
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        Text: English
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        StartPage: 623
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      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Dislocation density
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      – SubjectFull: Martensitic transformations
        Type: general
      – SubjectFull: Vickers hardness
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      – SubjectFull: Martensite
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      – SubjectFull: Chromium molybdenum steel
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      – SubjectFull: Mechanical behavior of materials
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      – SubjectFull: Bainite
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      – TitleFull: Effect of Interrupted Quenching on the Microstructure, Mechanical Properties and Dislocation Density of Steel AISI 4340.
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              M: 11
              Text: Nov2025
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              Y: 2025
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