On the Effect of Austenite Formation Kinetics on Microstructural Features of Cold Heading Quality CHQ Steel

Shahid Hussain Abro, Dr. Muhammad Sohail Hanif, Dr. Fayaz Hussain Kandhro

Abstract


Cold heading quality CHQ steel is widely used for making small components due to their excellent cold heading response. Austenite nucleation and growth morphology of a commercial CHQ steel has been studied by continuous heating experiments using lead-bath up-quenching at different heating temperatures. Modern Optical Microscope Olympus GX51, scanning electron microscopy techniques have been deployed to reveal and  interpret the microstructure and it  was found that At the 740°C, the microstructure shows the lack of homogeneity in the structure hence cold-head-ability of CHQ steel is anisotropic but at the high temperature in austenite domain at 60sec the resultant austenite is highly homogenous due to high volume fraction of austenite has been formed then the cold-head-ability properties of CHQ steel turned to be isotropic.

Key words: CHQ steel, Up-quenching, Phase transformation, microstructure, heating rate, austenite etc

Keywords


CHQ steel, Up-quenching, Phase transformation, microstructure, heating rate, austenite etc

References


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DOI: http://dx.doi.org/10.24949%2Fnjes.v11i2.399

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ISSN (Print): 2070-9900   ISSN (Online): 2411-6319