Abstract
The microstructure of a microalloyed large forging steel with different normalizing temperatures ranging from 820°C to 940°C were characterized. The evolution of austenite formation was determined in a range of heating temperature from 730°C to 940°C. The mechanical properties were evaluated by tensile test and Charpy V-notch impact test. The relationship between the microstructure and the properties was discussed. The results indicated that the microstructure composed of fine-grained layers (FGL) and coarse-grained layers (CGL) was obtained at 820°C. The finest and most homogeneous microstructure and optimal comprehensive mechanical properties were obtained at the normalizing temperature 880°C. There was a Hall-Petch relationship between the yield strength and the average grain size, and a linear relationship between the impact energy (KV2) and the reciprocal of the square root of the grain size (D−1/2). Both the strength and toughness of the steel can be attributed to grain refinement.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
