Next Article in Journal
The Influence of Carbon Coatings on the Functional Properties of X39Cr13 and 316LVM Steels Intended for Biomedical Applications
Previous Article in Journal
Probabilistic Modeling of Slip System-Based Shear Stresses and Fatigue Behavior of Coarse-Grained Ni-Base Superalloy Considering Local Grain Anisotropy and Grain Orientation
Open AccessArticle

Strain-Induced Ferrite Formation During Steckel Mill Simulations with Varying Roughing Pass Schedules

1
Department of Materials Engineering, Federal Institute of Maranhao, Sao Luis, 65075-441 Maranhao, Brazil
2
Mechanical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
3
Dynamic Systems Inc. 323 NY 355, Poestenkill, NY 12140, USA
4
Materials Engineering, McGill University, Montreal, QC H3A 0C5, Canada
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 814; https://doi.org/10.3390/met9080814
Received: 9 July 2019 / Revised: 19 July 2019 / Accepted: 22 July 2019 / Published: 24 July 2019
It has been previously demonstrated that austenite may undergo partial dynamic transformation (DT) during the plate rolling process. Austenite dynamically transforms into unstable ferrite during hot deformation even at very high temperatures. In this work, the plate rolling simulations, with emphasis on Steckel mill operations, through torsion testing under isothermal conditions were performed on an X70 steel. Four different roughing schedules were tested followed by five finishing passes with pass strains of 0.3 applied at 900 °C. The roughing schedules had zero, one, two and three roughing passes at a temperature of 1100 °C, strain of 0.4 and strain rate of 1 s−1. The stress–strain curves as well as the mean flow stress (MFS) behaviors indicated that both dynamic transformation (DT) and dynamic recrystallization (DRX) occurred during straining. The critical strains for the onset of DT and DRX were determined by means of the double differentiation method and the critical strain values decreased with the number of roughing and finishing strains from the first going to the last pass. It was observed that the volume fraction of the dynamically formed ferrite increased sharply during the finishing stage as the number of previous roughing passes increased, which can be attributed to higher strain accumulation. The results presented here indicate that improved models are needed to control the microstructure of the material during subsequent cooling. View Full-Text
Keywords: dynamic phase transformation; thermomechanical processing; plate rolling dynamic phase transformation; thermomechanical processing; plate rolling
Show Figures

Figure 1

MDPI and ACS Style

Palhano, H.B.; Aranas, C., Jr.; Rodrigues, S.F.; Silva, E.S.; Reis, G.S.; Miranda, E.J.P., Jr.; Siciliano, F.; Jonas, J.J. Strain-Induced Ferrite Formation During Steckel Mill Simulations with Varying Roughing Pass Schedules. Metals 2019, 9, 814.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop