Kinetics modeling of delta-ferrite formation and retainment during casting of supermartensitic stainless steel

Research output: Contribution to journalJournal article – Annual report year: 2017Researchpeer-review

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Kinetics modeling of delta-ferrite formation and retainment during casting of supermartensitic stainless steel. / Nießen, Frank; Tiedje, Niels Skat; Hald, John.

In: Materials & Design, Vol. 118, 2017, p. 138-145.

Research output: Contribution to journalJournal article – Annual report year: 2017Researchpeer-review

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@article{7aa77f87626145b09b19e8449fc23c75,
title = "Kinetics modeling of delta-ferrite formation and retainment during casting of supermartensitic stainless steel",
abstract = "The kinetics model for multi-component diffusion DICTRA was applied to analyze the formation and retainment of δ-ferrite during solidification and cooling of GX4-CrNiMo-16-5-1 cast supermartensitic stainless steel. The obtained results were compared with results from the Schaeffler diagram, equilibrium calculations and the Scheil model in Thermo-Calc, and validated by using microscopy and energy dispersive X-ray spectroscopy for chemical analysis on a cast ingot. The kinetics model showed that micro-segregation from solidification homogenizes within 2–3 s (70 °C) of cooling, and that retained δ-ferrite originates from the incomplete transformation to austenite. The kinetics model predicted the measured amount of δ-ferrite and the partitioning of Cr and Ni reasonably well. Further, it showed that slower cooling for the investigated alloy leads to less retained δ-ferrite, which is in excellent agreement with experimental results.",
keywords = "Casting, Delta ferrite, Diffusion, Kinetics modeling, Solid state transformation, Solidification, Supermartensitic stainless steel",
author = "Frank Nie{\ss}en and Tiedje, {Niels Skat} and John Hald",
year = "2017",
doi = "10.1016/j.matdes.2017.01.026",
language = "English",
volume = "118",
pages = "138--145",
journal = "Materials & Design",
issn = "0264-1275",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Kinetics modeling of delta-ferrite formation and retainment during casting of supermartensitic stainless steel

AU - Nießen, Frank

AU - Tiedje, Niels Skat

AU - Hald, John

PY - 2017

Y1 - 2017

N2 - The kinetics model for multi-component diffusion DICTRA was applied to analyze the formation and retainment of δ-ferrite during solidification and cooling of GX4-CrNiMo-16-5-1 cast supermartensitic stainless steel. The obtained results were compared with results from the Schaeffler diagram, equilibrium calculations and the Scheil model in Thermo-Calc, and validated by using microscopy and energy dispersive X-ray spectroscopy for chemical analysis on a cast ingot. The kinetics model showed that micro-segregation from solidification homogenizes within 2–3 s (70 °C) of cooling, and that retained δ-ferrite originates from the incomplete transformation to austenite. The kinetics model predicted the measured amount of δ-ferrite and the partitioning of Cr and Ni reasonably well. Further, it showed that slower cooling for the investigated alloy leads to less retained δ-ferrite, which is in excellent agreement with experimental results.

AB - The kinetics model for multi-component diffusion DICTRA was applied to analyze the formation and retainment of δ-ferrite during solidification and cooling of GX4-CrNiMo-16-5-1 cast supermartensitic stainless steel. The obtained results were compared with results from the Schaeffler diagram, equilibrium calculations and the Scheil model in Thermo-Calc, and validated by using microscopy and energy dispersive X-ray spectroscopy for chemical analysis on a cast ingot. The kinetics model showed that micro-segregation from solidification homogenizes within 2–3 s (70 °C) of cooling, and that retained δ-ferrite originates from the incomplete transformation to austenite. The kinetics model predicted the measured amount of δ-ferrite and the partitioning of Cr and Ni reasonably well. Further, it showed that slower cooling for the investigated alloy leads to less retained δ-ferrite, which is in excellent agreement with experimental results.

KW - Casting

KW - Delta ferrite

KW - Diffusion

KW - Kinetics modeling

KW - Solid state transformation

KW - Solidification

KW - Supermartensitic stainless steel

U2 - 10.1016/j.matdes.2017.01.026

DO - 10.1016/j.matdes.2017.01.026

M3 - Journal article

VL - 118

SP - 138

EP - 145

JO - Materials & Design

JF - Materials & Design

SN - 0264-1275

ER -