Microstructure Integration Upon Heating Temperatures in Low Carbon Mn Steel
Microstructure Integration Upon Heating Temperatures in Low Carbon Mn Steel
Shahid Hussain Abro1*, Mohammed N. Alghamdi2, Muhammad Sohail Hanif3, Hazim Moria2 andHamza Suharwardi1
ABSTRACT
Continuous heating phenomena performed at lead bath-quenching in which austenitic development morphology investigated. The CHQ steel analyzed in the context of Advanced Optical Microscope of Olympus GX51, SEM and Thin-film X-ray Diffracto-meter, with high-intensity mode have been deployed in order to examine the kinetics behavior of austenitic development at CHQ steel. On several quenching experiments the austenite formed at different temperatures and time 10s, 15s, 30s, and 60sec and 800°C 710°C, 740°C, 770°C respectively. Initial microstructure for both the steel is ferrite and pearlite. AC1 temp: is assumed to be 740°C and AC3 temperature 800°C has been examined methodically. The soaking time and holding temp: play an important role in developing of gamma-austenite. Mostly ferrite and cementite morphology exist at nucleation sites. At ferrite-ferrite grain interface the austenitic nucleation is not found. At high temperatures, the development of austenite at pearlitic nearby areas are highly noticed. At 800°C growth is about finger-type morphology. The fingers are parallel to pearlite so it is strongly believed that within this area the bainite structure is to be formed. This bainite is assumed to be austenite before cooling.
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December 2020
Vol. 39, Iss. 2, pp. 127-179
