Determination of Non-Recrystallization Temperature for Niobium Microalloyed Steel
Open Access
- 18 May 2021
- Vol. 14 (10), 2639
- https://doi.org/10.3390/ma14102639
Abstract
In the present investigation, the non-recrystallization temperature (TNR) of niobium-microalloyed steel is determined to plan rolling schedules for obtaining the desired properties of steel. The value of TNR is based on both alloying elements and deformation parameters. In the literature, TNR equations have been developed and utilized. However, each equation has certain limitations which constrain its applicability. This study was completed using laboratory-grade low-carbon Nb-microalloyed steels designed to meet the API X-70 specification. Nb- microalloyed steel is processed by the melting and casting process, and the composition is found by optical emission spectroscopy (OES). Multiple-hit deformation tests were carried out on a Gleeble® 3500 system in the standard pocket-jaw configuration to determine TNR. Cuboidal specimens (10 (L) × 20 (W) × 20 (T) mm3) were taken for compression test (multiple-hit deformation tests) in gleeble. Microstructure evolutions were carried out by using OM (optical microscopy) and SEM (scanning electron microscopy). The value of TNR determined for 0.1 wt.% niobium bearing microalloyed steel is ~ 951 °C. Nb- microalloyed steel rolled at TNR produce partially recrystallized grain with ferrite nucleation. Hence, to verify the TNR value, a rolling process is applied with the finishing rolling temperature near TNR (~951 °C). The microstructure is also revealed in the pancake shape, which confirms TNR.Funding Information
- Universiti Sains Malaysia (1001/PAERO/870052)
This publication has 22 references indexed in Scilit:
- Analysis of Copper Effect on Microstructures and Mechanical Properties in Microalloyed SteelsISIJ International, 2008
- Effect of molybdenum on continuous cooling bainite transformation of low-carbon microalloyed steelMaterials & Design (1980-2015), 2006
- Determinations of the Non-Recrystallization Temperature for X52 Steel Produced by Compact Slab Process Combined with Direct Hot RollingJournal of Materials Engineering and Performance, 2006
- Influence of plastic deformation conditions on structure evolution in Nb–Ti microalloyed steelJournal of the American Academy of Dermatology, 2003
- The effects of thermo-mechanical control process on microstructures and mechanical properties of a commercial pipeline steelMaterials Science and Engineering: A, 2002
- The influence of niobium supersaturation in austenite on the static recrystallization behavior of low carbon microalloyed steelsMetallurgical and Materials Transactions, 1996
- Determination of Recrystallization Stop Temperature from Rolling Mill Logs and Comparison with Laboratory Simulation Results.ISIJ International, 1994
- Solubility product for niobium carbide in austeniteMetallurgical Transactions A, 1984
- Austenite grain coarsening in microalloyed steelsMetallurgical Transactions A, 1983
- Niobium carbonitride precipitation and austenite recrystallization in hot-rolled microalloyed steelsMetallurgical Transactions A, 1980