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

NALÇACI B., Aydin O. C., Yilmaz S., KILIÇLI V.

Metal Science and Heat Treatment, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1007/s11041-023-00843-z
  • Dergi Adı: Metal Science and Heat Treatment
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: steel AISI 4340, interrupted quenching, bainite plus martensite, duplex microstructure, dislocation density, mechanical properties
  • Gazi Üniversitesi Adresli: Evet

Özet

© 2023, Springer Science+Business Media, LLC, part of Springer Nature.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.