Next Article in Journal
Recent Progress in Understanding the Nano/Micro-Mechanical Behavior of Austenite in Advanced High Strength Steels
Previous Article in Journal
How Austenitic Is a Martensitic Steel Produced by Laser Powder Bed Fusion? A Cautionary Tale
 
 
Article

Development of Ultrafine Grain IF Steel via Differential Speed Rolling Technique

by 1,* and 2,*
1
School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Korea
2
School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 16419, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Andrey Belyakov
Metals 2021, 11(12), 1925; https://doi.org/10.3390/met11121925
Received: 7 November 2021 / Revised: 26 November 2021 / Accepted: 26 November 2021 / Published: 29 November 2021
The aim of this paper was to investigate the microstructural development and properties of interstitial free (IF) steel fabricated using the DSR (differential speed rolling) process. Severe plastic deformation of the DSR passes was imposed on the sample for up to four passes, leading to ~1.7 total strain with a speed ratio of 1:4 between the two rolls. Microstructural observation revealed that the equiaxed grain size of ~0.7 µm, including the formation of grain boundaries with a high angle of misorientation, was reached after four operations of DSR, which was attributed to the grain subdivision of severely elongated ferrite grain. Since the deformation mode of the DSR operation was dominated by severe shear deformation, the main shear texture of the bcc components appeared in all DSR operations in which the α-fiber of the {110} slip became a main component in accommodating the severe plastic deformation of the DSR process. The intensity of the shear texture, the {110} and {112} slip, increased by increasing the number of passes. Moreover, the γ-fiber of the <112>-type planes was activated as a result of the alternation of the shear direction during sample rotation. The microhardness and room temperature tensile tests revealed that the strength of the IF steel improved as the amount of strain increased, and this was attributed to the grain refinement and texture characteristics of the samples after the DSR processing. View Full-Text
Keywords: severe plastic deformation; differential speed rolling; IF steel; structure; mechanical properties severe plastic deformation; differential speed rolling; IF steel; structure; mechanical properties
Show Figures

Figure 1

MDPI and ACS Style

Ko, Y.G.; Hamad, K. Development of Ultrafine Grain IF Steel via Differential Speed Rolling Technique. Metals 2021, 11, 1925. https://doi.org/10.3390/met11121925

AMA Style

Ko YG, Hamad K. Development of Ultrafine Grain IF Steel via Differential Speed Rolling Technique. Metals. 2021; 11(12):1925. https://doi.org/10.3390/met11121925

Chicago/Turabian Style

Ko, Young Gun, and Kotiba Hamad. 2021. "Development of Ultrafine Grain IF Steel via Differential Speed Rolling Technique" Metals 11, no. 12: 1925. https://doi.org/10.3390/met11121925

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop