Influence of Columbium on the 870°C Creep Properties of 18% Chromium Ferritic Stainless Steels

Johnson, John N.

doi:10.4271/810035

Cited by 4 publications

(3 citation statements)

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“…It is a strong Lavesphase former [23] and in combined alloying with tungsten, for improved solid solution strengthening, and silicon to accelerate nucleation [24][25][26][27][28], forms a thermodynamically stable (Fe,Cr,Si)2(Nb,W)-Laves phase [16,29,30]. With Nb being a strong carbonitride former it is necessary to restrict C and N to a minimum (< 0.01 wt.-%), because even small contents of these species may decrease the amount of Nb available [28,[31][32][33] for Laves phase precipitation. Furthermore, primary TiN particles may act as nucleation sites of niobium consuming Nb(C, N) [34,35], which may additionally affect the formation and stability of the desired Laves phase particles in a negative way.…”

Section: Alloy Designmentioning

confidence: 99%

Science and Technology of High Performance Ferritic (HiperFer) Stainless Steels

Kuhn¹,

Talik²,

Fischer³

et al. 2020

Preprint

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Future, flexible thermal energy conversion systems require new, demand-optimized highperformance materials. The High performance Ferritic (HiperFer) stainless steels, under development at the Institute of Microstructure and Properties of Materials (IEK-2) at Forschungszentrum Jülich GmbH in Germany, provide a balanced combination of fatigue, creep and corrosion resistance at reasonable price. This paper outlines the scientific background of alloy performance development, which resulted in an age-hardening ferritic, stainless steel grade. Furthermore, technological properties are addressed and the potential concerning application is estimated by benchmarking versus conventional state of the art materials.

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Section: Alloy Designmentioning

confidence: 99%

Science and Technology of High Performance Ferritic (HiperFer) Stainless Steels

Kuhn¹,

Talik²,

Fischer³

et al. 2020

Preprint

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show abstract

“…Sawatani et al [20] indicated that the toughness of the hot-rolled sheet decreases as the growth of the Laves phase in number and size at the grain boundaries. Morris et al [33] found that rapid coarsening of the Laves precipitate particles in Fe-25% Al-2% Nb alloy at higher temperatures leads to strength loss when the temperature up to 900 • C. The study of Johnson [34] also indicates that the strengthening effect in 18% Cr ferritic steels appears related to the Laves phase precipitate, which forms at elevated temperatures. In addition, Kato et al [35] studied the 17Cr-0.5Nb-0.5Si steel after aging at 1073 K (800 • C) exceeds 0.1 ks, the results showed that the content of the Laves phase precipitates increased, and the addition of Si promoted the precipitation of the Laves phase.…”

Section: Effects By the Laves Phase Precipitatesmentioning

confidence: 98%

Effect of Normalizing Treatment on Mechanical Properties of AISI 441 Stainless Steel Prepared by Investment Casting

Hu¹,

Mao²,

Yan³

et al. 2021

Metals

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In this paper, AISI 441 stainless steel was investigated as a casting steel using the investment casting process (ICP). The microstructure and mechanical properties of the as-cast and normalizing treatment samples were analyzed. The results show that the tensile strength of as-cast AISI 441 prepared by ICP is 458 MPa, and the elongation is 22.7%. Normalizing treatment can improve the mechanical performance of AISI 441 prepared by ICP, but strength and elongation have a slightly decreasing trend with increasing normalizing temperature and time. The suitable normalizing treatment condition is 850 °C for 2 h. It was found that normalizing temperature and time have little effect on grain size and carbonitride. There was an increasing trend in the mean equivalent length (MEL) of the Laves phase as normalizing temperature and time increases. The effect of normalizing treatment on strength increase was mainly related to the change of the Laves phase size.

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“…It is a strong Laves-phase former [23] and in combined alloying with tungsten, for improved solid solution strengthening, and silicon to accelerate nucleation [24][25][26][27][28], forms a thermodynamically stable (Fe,Cr,Si) 2 (Nb,W)-Laves phase [16,29,30]. With Nb being a strong carbonitride former it is necessary to restrict C and N to a minimum (< 0.01 wt.%), because even small contents of these species may decrease the amount of Nb available [28,[31][32][33] for Laves phase precipitation. Furthermore, primary TiN particles may act as nucleation sites of niobium consuming Nb(C, N) [34,35], which may additionally affect the formation and stability of the desired Laves phase particles in a negative way.…”

Section: Alloy Designmentioning

confidence: 99%

Science and Technology of High Performance Ferritic (HiperFer) Stainless Steels

Kuhn

Talik

Fischer

et al. 2020

Metals

View full text Add to dashboard Cite

Future, flexible thermal energy conversion systems require new, demand-optimized high-performance materials. The High performance Ferritic (HiperFer) stainless steels, under development at the Institute of Microstructure and Properties of Materials (IEK-2) at Forschungszentrum Jülich GmbH in Germany, provide a balanced combination of fatigue, creep and corrosion resistance at reasonable price. This paper outlines the scientific background of alloy performance development, which resulted in an age-hardening ferritic, stainless steel grade. Furthermore, technological properties are addressed and the potential concerning application is estimated by benchmarking versus conventional state of the art materials.

show abstract

Influence of Columbium on the 870°C Creep Properties of 18% Chromium Ferritic Stainless Steels

Cited by 4 publications

References 0 publications

Science and Technology of High Performance Ferritic (HiperFer) Stainless Steels

Science and Technology of High Performance Ferritic (HiperFer) Stainless Steels

Effect of Normalizing Treatment on Mechanical Properties of AISI 441 Stainless Steel Prepared by Investment Casting

Science and Technology of High Performance Ferritic (HiperFer) Stainless Steels

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