Determination of Non-Recrystallization Temperature for Niobium Microalloyed Steel

Akhtar, Mohammad Nishat and Khan, Muneer and Khan, Sher Afghan and Afzal, Asif and Subbiah, Ram and Ahmad, Sheikh Nazir and Husain, M M and Butt, Mohammad Mursaleen and Othman, Abdul Rahim and Bakar, Elmi Abu (2021) Determination of Non-Recrystallization Temperature for Niobium Microalloyed Steel. Materials, 14(10) . p. 2639.



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

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:microalloy; niobium; recrystallization temperature; microstructure; temperature
Divisions:Material Science and Technology
ID Code:8354
Deposited By:Dr. A K Sahu
Deposited On:20 May 2021 13:04
Last Modified:20 May 2021 13:04
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