@ARTICLE{Işıkgül_A._Investigation_2023,
 author={Işıkgül, A. and Ahlatci, H. and Esen, İ. and Türen, Y. and Yağız, O.},
 volume={vol. 68},
 number={No 3},
 journal={Archives of Metallurgy and Materials},
 pages={1191-1204},
 howpublished={online},
 year={2023},
 publisher={Institute of Metallurgy and Materials Science of Polish Academy of Sciences},
 publisher={Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences},
 abstract={This study investigates mechanical properties of accelerated cooled and self-tempered (AC-ST) H-type S275JR quality steel sections in HEA120 and HEB120 sizes. The cooling process is conducted with a specially manufactured system that sprays a coolant consisting of a water + compressed air mixture on the section surfaces. Cooling times were applied as 10 and 30 seconds using 4 and 12 bar compressed air + water at an average constant pressure of 5 bar and a constant flow rate of 0.08 kg/s. In the HEA120 sections, the highest cooling rate was obtained with 83°C/s in the web region under the cooling time of 30 s and the air pressure cooling condition of 12 bar. At the cooling rate up to 6°C/s, the microstructure is transformed to acicular ferrite and polygonal ferrite phase from Ferrite+Pearlite. But upper bainite phase was formed at a cooling rate of 30°C/s, and a small amount of martensite and lower bainite microstructures were observed at a cooling rate of 60°C/s and above. The hardness in the untreated sections, in the range of 106-120 HB, was increased to 195 HB at a cooling rate of 83 C/s in the web region of the HEA120 section. For a cooling rate of 23°C/s, the maximum compressive residual stresses of –352 MPa are measured in the crotch region of the HEB120. And for a cooling rate of 6°C/s, the maximum tensile residual stresses of 442 MPa were determined in the flange region of the HEA120 section.},
 type={Article},
 title={Investigation of Mechanical Properties of Accelerated Cooled and Self-Tempered H-Type Structural Sections},
 URL={http://journals.pan.pl/Content/128480/PDF/AMM-2023-3-48-Isikgul.pdf},
 doi={10.24425/amm.2023.145493},
 keywords={H-Type Sections, Accelerated Cooling and Self-Tempering (AC-ST), Construction Steel, Cooling Rate},
}