Abstract
The present work is devoted to investigate the correlation between the Zener–Hollomon parameter and the grain structure of the thermo-mechanically processed dual phase twinning induced plasticity (TWIP) steel utilizing the friction stir processing (FSP) technique. To this end 3mm thick workpieces were subjected to FSP under rotational speeds of 800–2500rpm and constant traveling speed of 50mm/min. Additionally, isothermal hot compression tests were conducted at temperatures in the range of 800–1100°C under the strain rates of 0.001–0.1s−1. Employing the flow stress data acquired from compression tests, the precise value of deformation activation energy (Q) was determined through Arrhenius-type constitutive model. The results indicate that increasing the rotational speed from 800 to 2500rpm has led to Z-value variation between 1.04×1020 and 0.03×1020s−1. However, the scanning electron microscopy (SEM) characterization shows that the grain size reaches a certain minimum value at 1600rpm. Three different models have been established to interpret the correlation between Z-value and the size of FSP-induced grains in the case of the experimental TWIP steel.
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.
