The Effects of Hot Deformation Parameters on the Size of Dynamically Recrystallised Austenite Grains of HSLA Steel
 
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1
Faculty of Fundamentals of Technology, Lublin University of Technology ul. Nadbystrzycka 38D, 20-618 Lublin, Poland
2
Faculty of Mechanical Eengineering, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland
CORRESPONDING AUTHOR
Joanna Szulżyk-Cieplak   

Fundamentals of Technology Faculty, Lublin University of Technology, ul. Nadbystrzycka 38D, 20-618 Lublin, Poland
Publication date: 2020-06-01
 
Adv. Sci. Technol. Res. J. 2020; 14(2):76–84
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ABSTRACT
Materials scientists are seeking to produce metals with reduced weight and dimensions while maintaining the appropriate mechanical properties. There are several ways to improve the internal structure of metals, such as the ultrasound used to solidify liquid metal (this is a patent of Toyota Motors Company). The homogeneity of the grains and the uniformity of the metal structure affects its mechanical strength.This paper presents the results of investigations into the effects of hot deformation parameters in compression on the austenite grain size in HSLA steel (0.16% C, 0.037% Nb, 0.004% Ti, 0.0098% N). The axisymmetric compression investigations were performed on cylindrical investigation specimens of d=1.2 using the Gleeble 3800 simulator. The strain rate=1s-1÷15.9s-1 and strain degree ε=1.2. Before deformation, the research specimens were austenitized at TA = 1100 ÷ 1250°C. Metallographic observations of the primary austenite grains were conducted with an optical microscope, while the structure of dynamically recrystallized austenite, inherited by martensite, was examined by EBSD technique using a scanning electron microscope