Effect of isothermal transformation treatment and tempering on the microstructure and hardness of a medium c and high si steels

2021-01-01
KAFADAR, Gülten
Kalkanlı, Ali
ÖZDEMİR, ABBAS TAMER
Ögel, Bilgehan
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
190
views
0
downloads
This research work aims to study the effect of 2wt%Mo on bainitic transformation kinetics and bainite morphology in 0.6wt%C-1.2wt%Si-1.0wt%Mn-0.2wt%Cr steel. Specimens are austenitized at 950°C and rapidly cooled in salt bath and isothermally treated between 200°C-300°C for different time intervals. Another set of specimens are rapidly cooled in oil after an austenitization treatment and then tempered in the temperature range of 200°C-550°C. In C-Mn-Si specimens, the amount of retained austenite increases with increasing the amount of bainite but no retained austenite is observed in bainitic C-Mn-Si-Mo specimens. The tempering behavior of C-Mn-Si-Mo alloy is considerably different than that of the Mo free alloy. Mo in a martensitic microstructure of C-Mn-Si-Mo alloy shows the secondary hardening effect peak upon tempering at 500°C. The examination of the secondary hardening would also contribute to the behavior of Mo in tempered bainitic steels. The bainitic specimens do not show a peak hardness but softening is retarded upon tempering at the same temperature range.
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85106667493&origin=inward
https://hdl.handle.net/11511/91099
Department of Metallurgical and Materials Engineering, Article

Suggestions

Effects of oxidative functionalization and aminosilanization of carbon nanotubes on the mechanical and thermal properties of polyamide 6 nanocomposites
Kaynak, Cevdet (SAGE Publications, 2013-11-13)
The focus of this study is to investigate the effects of oxidative functionalized carbon nanotubes (f-CNTs) and aminosilanized carbon nanotubes (s-CNTs) on the mechanical and thermal properties of polyamide 6 nanocomposites. Oxidation of nanotube surfaces was conducted with sulfuric acid/nitric acid mixture and then aminosilanization was carried out with -aminopropyltriethoxysilane. Nanocomposites were compounded by melt mixing technique and shaped by injection molding. Scanning electron microscopy images r...
Effect of soil-bridge interaction on the magnitude of internal forces in integral abutment bridge components due to live load effects
Dicleli, Murat (Elsevier BV, 2010-01-01)
In this study, the effect of soil-bridge interaction on the magnitude of the internal forces in integral abutment bridge (IAB) components due to live load effects is studied. For this purpose, structural models of typical IABs are built by including and excluding the effect of backfill and foundation soil. Analyses of the models are then conducted under an AASHTO live load. In the analyses, the effects of the backfill and foundation soil on the magnitude of the internal forces in IAB components are studied ...
Effect of soil and substructure properties on live-load distribution in integral abutment bridges
Dicleli, Murat (American Society of Civil Engineers (ASCE), 2008-09-01)
This study is aimed at investigating the effect of soil-structure interaction and substructure properties at the abutments on the distribution of live-load effects in integral abutment bridge (IAB) components. For this purpose, numerous 3D and corresponding 2D structural models of typical IABs are built and analyzed under AASHTO live-load. In the analyses, the effect of various geotechnical and substructure properties such as foundation soil stiffness, considering and neglecting the effect of backfill, back...
Effect of magnetic field and gamma irradiation on the electrical properties and structure of the Tl-based ceramic superconductors
Ozkan, H; Hasanlı, Nızamı; Kayed, T (IOP Publishing, 2000-02-01)
The voltage-current (V-I) characteristics, critical temperatures and the critical currents of Tl2Ba2CaCu2O8 (Tl-2212) and Tl2Ba2Ca2Cu3O10 (Tl-2223) ceramic superconductors were studied in magnetic fields up to 80 mT after several gamma irradiations up to 100 MR. The effect of gamma irradiation on the structure of these materials has also been studied. The normal state resistance increases by 20-30% with gamma irradiation, most of the changes taking place in low gamma doses up to 10 MR. The critical temperat...
EFFECT OF AGING ON MECHANICAL PROPERTIES OF Al-8Si-8Fe-1.4V/SiCp COMPOSITES
Essari, A.; Sariuglo, F.; Petrovic, Z.; Sedmak, A.; Samardzic, I. (2016-01-01)
In this study, Al-8Fe-8Si-1.4V/SiCp composites fabricated by squeeze casting process were age-hardened to study the influence of heat treatment on mechanical properties, such as hardness, bending strength and modulus of elasticity. The cast samples were solid soluted at 540 degrees C for one hour, then quenched in water to room temperature, and finally aged at 190 degrees C for 2, 4, 6, 8 and 10 hours for hardness test and at 195 degrees C for 2, 6 and 10 hours for bending strength determination.
Citation Formats
G. KAFADAR, A. Kalkanlı, A. T. ÖZDEMİR, and B. Ögel, “Effect of isothermal transformation treatment and tempering on the microstructure and hardness of a medium c and high si steels,” ISIJ International, pp. 1679–1687, 2021, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85106667493&origin=inward.
METU IIS - Integrated Information Service open@metu.edu.tr