Some Considerations on Austenite Grain Growth Kinetics from High-Temperature Laser Scanning Confocal Microscopy Observations

Publikation: Beitrag in FachzeitschriftÜbersichtsartikelBegutachtung


For more than 20 years, high-temperature laser scanning confocal microscopy (HT-LSCM) has become worldwide a proven technique for observing various metallurgical phenomena in situ. HT-LSCM turns out to be a reliable and effective method for the observation of quantification austenite grain growth kinetics in steel, being highly relevant in casting and steel processing. In the present article, the measurement technique is briefly introduced followed by some basics on austenite grain growth. Finally, selected examples of recent research activities are discussed, including investigations into pure iron and the systems Fe–P, Fe–C, Fe–Al–N, and Fe–C–Nb–N. The influence of P on the grain growth kinetics is remarkable. At 1350 °C, the final grain size decreases from 255 μm in pure iron to 145 μm by adding 0.044 wt% P. In contrast, C enhances the grain growth in specific alloying ranges (0–0.30 wt%C), particularly at elevated temperatures. For a Al content of 0.025 wt% and only 50 wt ppm N, AlN loses the pinning effect above 1150 °C. In case of Nb(C,N), an elevated Nb content (0.085 wt%) provides stabilization of Nb(C,N) at 1150 °C, but at 1250 °C, no pinning of Nb(C,N) is visible anymore.
Seiten (von - bis)1-10
FachzeitschriftSteel research international
Jahrgang??? Stand: 12. April 2024
Ausgabenummer??? Stand: 12. April 2024
PublikationsstatusVeröffentlicht - 25 Okt. 2023

Bibliographische Notiz

Funding Information:
The first author would like to express his gratefulness to Professor Priotr R. Scheller, who supported the installation of the HT‐LSCM at Montanuniversitaet Leoben with all his expertise and also for many fruitful and inspiring discussions at so many different places in the world. The authors gratefully acknowledge the financial support under the scope of the COMET program within the K2 Center “Integrated Computational Material, Process and Product Engineering (IC‐MPPE)” (project no. 859480). This program is supported by the Austrian Federal Ministries for Climate Action, Environment, Energy, Mobility, Innovation and Technology (BMK) and for Digital and Economic Affairs (BMDW), represented by the Austrian research funding association (FFG), and the federal states of Styria, Upper Austria, and Tyrol.

Publisher Copyright:
© 2023 The Authors. Steel Research International published by Wiley-VCH GmbH.

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