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    Effect of hot rolling process parameters on the microstructure and mechanical properties of continuously cooled low-carbon high-strength low-alloy (HSLA) steel
    (Walter De Gruyter Gmbh, 2022) Kucukakarsu, Furkan Yilmaz; Ayhan, Ismail Irfan; Alan, Emre; Tastemur, Demet; Gunduz, Suleyman
    In this work, high-strength low-alloy (HSLA) steel with 0.22 wt% carbon was produced in laboratory scale and hot rolled with a total deformation of 42% via 4, 5, or 6 passes. After multipass hot rolling process, samples were examined either in as-rolled (AR) or as-rolled and heat-treated (ARH) conditions. The results indicated that microstructural and mechanical properties of HSLA steels are influenced by hot rolling conditions for both cases. It was observed that strength values in AR samples have a tendency to increase with increment in rolling pass number. In contrast to AR samples, it was seen that the mechanical properties were slightly decreased in ARH samples that were austenitized at 1150 degrees C for 45 min and then cooled in still air. Microstructural investigations showed that finer precipitates in AR samples are obviously more than that of ARH samples, as an evidence for higher strength results by precipitation hardening. In addition to precipitation strengthening, refinement of lath bainite and amount of blocky martensite/austenite in AR samples favor the increase in strength.
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    The Influence of Multi-Pass Hot Rolling Parameters and Subsequent Heat Treatment on Microstructure and Mechanical Properties of Medium-Carbon Steel
    (Springer India, 2024) Ayhan, Ismail Irfan; Guney, Caner; Alan, Emre; Bal, Ahmet; Kayadegirmeni, Muhammed Fatih; Kucukakarsu, Furkan Yilmaz; Tastemuer, Demet
    In this study, the influence of the number of roll passes in hot rolling process to microstructural and mechanical properties of medium-carbon steel within applying the same amount of total deformation was investigated under as-rolled and quenched and tempered conditions. Tensile strengths of as-rolled specimens were increased depending on the higher volume percentage of martensite at lower roll passes. The size and distribution of martensite/austenite formations directly contribute to toughness rather than tensile strength, and the coarser martensite/austenite islands give rise to differences between actual and software predicted tensile strengths. It was revealed that fracture surfaces of as-rolled specimens were influenced by the rolling pass number changes. Spherical chromium (Cr) and molybdenum (Mo)-rich precipitates were formed more intensively in samples produced with 4 roll passes compared to 5 and 6 roll passes. Finer carbide formations and smaller dimples were found in heat-treated specimens compared to as-rolled ones. Furthermore, the positive contribution of initial martensite microstructure to mechanical properties was observed in heat-treated specimens.