Abstract
Thermal cycle (welding simulations) at the inter-critical region were performed on an Si and V micro-alloyed (not heat-treated) rail steel. The beginning of austenitization temperature (Ac1) in the micro-alloyed rail steel occurred significantly above that observed in an alternative heat-treated rail steel. Very little pearlite alteration was observed until austenitization at a temperatures above 750°C, where there was a reduction in hardness and onset of spheroidization. The maximum spheroidization together with the lowest observed hardness occurred at 760°C. It was also observed that there is a linear correlation between hardness and volume fraction of spheroidization of cementite. By the dilatometric variation, contraction due to austenitization was observed only from 760°C onwards in the 60 s isothermal period at the austenitization temperature. These results may lead to a new approach to weldability and reduction of the softened region concerning rail welding.
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 callMore From: Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
Disclaimer: 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.
