Der Einfluß der Ausscheidung von M23(B,C)6 auf die Eigenschaften von niedriglegierten borhaltigen Stählen

Maitrepierre, Ph.; Rofes-Vernis, J.; Thivellier, D.; Tricot, R.

doi:10.1515/htm-1978-330105

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“…[ 1 ] The effect of B addition is remarkable even in small amounts, e.g., several tens of ppm or less. [ 2–7 ] The co‐addition of alloying element, such as Mo and Nb, further improves the hardenability‐enhancing effect of B. [ 8–12 ] These are thought to occur due to the segregation of B at the grain boundaries of austenite, lowering the grain boundary energy, and thereby impairing the ability of the grain boundaries as nucleation sites for cooling transformations.…”

Section: Introductionmentioning

confidence: 99%

“…[ 13–19 ] It is also known that the hardenability decreases when the amount of B addition increases, which is ascribed to the fact that borocarbide precipitates at the grain boundary can serve nucleation sites for soft phase, e.g., ferrite. [ 4,5,8 ] Thus, the critical amount of B and alloying elements to maximize hardenability has been discussed extensively.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of B Segregation at Austenite Grain Boundary in Low Carbon Steel

Enomoto,

Wang

2024

steel research int.

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The diffusion and segregation of boron (B) at the austenite grain boundary have been simulated in continuously cooled low carbon steels to elucidate the role of vacancy, the influence of austenite grain size and thermodynamic interaction between solutes. First‐principles calculations were carried out to obtain the stable configuration of B‐vacancy complexes and the binding energies therein. The thermodynamic equations of a hybrid interstitial‐substitutional solid solution were utilized to evaluate the contribution of interstitial B atoms and B‐vacancy complexes to boundary enrichment. The latter contribution did not appear to be significant probably due to their small concentration and/or low mobility. The grain growth of austenite is likely to play a significant role in B enrichment at elevated temperatures. Due to the strong C‐Mo interaction, the carbon flux in the grain interior did decrease, but the interaction within the grain boundary had a much greater influence on the segregation amount. The B enrichment in an Fe‐C‐B‐Mo quaternary alloy was simulated for comparison with experiment. A sophisticated approach, e.g., segregation energies spectrum, may be necessary to reproduce adequately the B segregation behavior, which also depends sensitively on process parameters and microstructure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%