Experimental Analysis of the Nb(C,N) Pinning Effects on Austenite Grain Growth Coupled with Mean‐Field Simulations.

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Title: Experimental Analysis of the Nb(C,N) Pinning Effects on Austenite Grain Growth Coupled with Mean‐Field Simulations.
Authors: Kern, Maximilian1 (AUTHOR) maximilian.kern@unileoben.ac.at, Bernhard, Michael1 (AUTHOR), Presoly, Peter1 (AUTHOR), Retzl, Philipp2 (AUTHOR), Kozeschnik, Ernst2 (AUTHOR), Ilie, Sergiu3 (AUTHOR), Six, Jakob3 (AUTHOR), Bernhard, Christian1 (AUTHOR)
Source: Steel Research International. Nov2025, Vol. 96 Issue 11, p214-228. 15p.
Subjects: Austenite, Crystal grain boundaries, Isothermal processes, Metal crystal growth, Laser microscopy, Niobium alloys
Abstract: The pinning forces of niobium carbonitrides (Nb(C,N)) on grain boundary (GB) migration in austenite (γ‐Fe) are studied under isothermal annealing conditions at temperatures of 950, 1050, 1150, and 1250 °C. High‐temperature laser scanning confocal microscopy enables in situ observations and quantification of the grain size evolution in 12 Fe–Nb–C–N alloys, each containing 0.15 wt% C, with Nb content ranging from 0 up to 0.08 wt% and N content ranging from 60 to 120 ppm. The quantified mean grain sizes are further applied for the parametrization of the Nb‐induced solute drag effect and the Smith–Zener pinning forces due to Nb(C,N) in a grain growth kinetics model in MatCalc 6.04. In the first step the three Fe–C–N ternary reference alloys without Nb addition are used to determine the effective GB mobility for the base material. Then, the results of Nb‐containing alloys with a wide variation of Nb and N serve for the parametrization of solute drag and pinning forces. The experimentally obtained results align strongly with simulation predictions for grain growth kinetics, supporting the model's applicability in describing pinning effects in the austenitic region. [ABSTRACT FROM AUTHOR]
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  Label: Title
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  Data: Experimental Analysis of the Nb(C,N) Pinning Effects on Austenite Grain Growth Coupled with Mean‐Field Simulations.
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  Data: <searchLink fieldCode="AR" term="%22Kern%2C+Maximilian%22">Kern, Maximilian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> maximilian.kern@unileoben.ac.at</i><br /><searchLink fieldCode="AR" term="%22Bernhard%2C+Michael%22">Bernhard, Michael</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Presoly%2C+Peter%22">Presoly, Peter</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Retzl%2C+Philipp%22">Retzl, Philipp</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kozeschnik%2C+Ernst%22">Kozeschnik, Ernst</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ilie%2C+Sergiu%22">Ilie, Sergiu</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Six%2C+Jakob%22">Six, Jakob</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bernhard%2C+Christian%22">Bernhard, Christian</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Steel+Research+International%22">Steel Research International</searchLink>. Nov2025, Vol. 96 Issue 11, p214-228. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Austenite%22">Austenite</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+grain+boundaries%22">Crystal grain boundaries</searchLink><br /><searchLink fieldCode="DE" term="%22Isothermal+processes%22">Isothermal processes</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+crystal+growth%22">Metal crystal growth</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+microscopy%22">Laser microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Niobium+alloys%22">Niobium alloys</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The pinning forces of niobium carbonitrides (Nb(C,N)) on grain boundary (GB) migration in austenite (γ‐Fe) are studied under isothermal annealing conditions at temperatures of 950, 1050, 1150, and 1250 °C. High‐temperature laser scanning confocal microscopy enables in situ observations and quantification of the grain size evolution in 12 Fe–Nb–C–N alloys, each containing 0.15 wt% C, with Nb content ranging from 0 up to 0.08 wt% and N content ranging from 60 to 120 ppm. The quantified mean grain sizes are further applied for the parametrization of the Nb‐induced solute drag effect and the Smith–Zener pinning forces due to Nb(C,N) in a grain growth kinetics model in MatCalc 6.04. In the first step the three Fe–C–N ternary reference alloys without Nb addition are used to determine the effective GB mobility for the base material. Then, the results of Nb‐containing alloys with a wide variation of Nb and N serve for the parametrization of solute drag and pinning forces. The experimentally obtained results align strongly with simulation predictions for grain growth kinetics, supporting the model's applicability in describing pinning effects in the austenitic region. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Steel Research International is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/srin.202500095
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        Text: English
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        PageCount: 15
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      – SubjectFull: Austenite
        Type: general
      – SubjectFull: Crystal grain boundaries
        Type: general
      – SubjectFull: Isothermal processes
        Type: general
      – SubjectFull: Metal crystal growth
        Type: general
      – SubjectFull: Laser microscopy
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      – SubjectFull: Niobium alloys
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      – TitleFull: Experimental Analysis of the Nb(C,N) Pinning Effects on Austenite Grain Growth Coupled with Mean‐Field Simulations.
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            – D: 01
              M: 11
              Text: Nov2025
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