Influences of Vanadium and Silicon on Case Hardness and Residual Stress of Nitrided Medium Carbon Steels

Klemm-Toole, Jonah; Burnett, Michael; Clarke, Amy J.; Speer, John G.; Findley, Kip O.

doi:10.1007/s11661-020-06063-x

Cited by 5 publications

(1 citation statement)

References 44 publications

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“…On the one hand, the precipitation of X in Fe-3.5C-3Si-M might be accelerated by co-precipitation of X and Cu, Mn 3 N 2 or MnSiN 2 , if the latter precipitates faster in α-Fe than X. Accelerated X formation is known from nitriding of Fe-Ti/Cr-Si alloys [22], in which X nucleates at phase boundaries of α-Fe and previously formed CrN and TiN precipitates. Moreover, MnSiN 2 possibly forming in addition to X may also deplete α-Fe in Si, contributing to the observed increase in a α .…”

Section: Precipitation Of X In α-Fe Of the Diffusion Zone (Dz)mentioning

confidence: 99%

Interaction of N with White-solidified Cast Iron Model Alloys: The Effect of Mn and Cu on the Formation of Fe and Si Nitrides

Kante

Leineweber

2021

JCME

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Surface remelting and subsequent nitriding improves the surface properties of cast irons. Upon remelting, a white-solidified surface layer forms, which contains coarse Si-free eutectic cementite (θ) and Si-enriched ferrite, pearlite or martensite in the intercarbidic regions between the eutectic θ. Nitriding produces a compound layer at the surface, which is composed of ε and γ’-iron (carbo)nitrides and enhances the corrosion resistance. Nitriding of white-solidified Fe-C-Si alloys, being model materials for remelted low-alloy ferritic cast irons, has shown that Si dissolved in α-Fe notably affects the formation of ε and γ’ in intercarbidic regions while Si simultaneously precipitates as amorphous nitride, X. Under process conditions only allowing for the formation of γ’ in pure Fe, Si dissolved in α-Fe promotes the formation of ε over the formation γ’, whereas Si-free eutectic θ transforms into nitride following the sequence θ → ε → γ’. The present work studies the nitriding of white-solidified Fe-3.5wt.%C-3wt.%-M alloys with additions of M = 1 wt.% Mn, 1 wt.% Cu or 1 wt.% Mn + 1 wt.% Cu, serving as model materials for remelted pearlitic cast irons. The presence of Mn and/or Cu causes notable deviations from the nitriding behavior known from Fe-C-Si alloys. Mn accelerates the precipitation of X in intercarbidic regions and obstructs the transformation of ε formed from Si-free θ into γ’. Cu promotes the formation of γ’ in Si-rich intercarbidic regions, surpassing the ε-promoting effect of Si.

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Section: Precipitation Of X In α-Fe Of the Diffusion Zone (Dz)mentioning

confidence: 99%

Interaction of N with White-solidified Cast Iron Model Alloys: The Effect of Mn and Cu on the Formation of Fe and Si Nitrides

Kante

Leineweber

2021

JCME

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Improving the fatigue performance of vanadium and silicon alloyed medium carbon steels after nitriding through increased core fatigue strength and compressive residual stress

Klemm-Toole

Clarke

Findley

2021

Materials Science and Engineering: A

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Plasma Nitriding of an Air-Hardening Medium Manganese Forging Steel

Gramlich

Auger

Richter

2022

HTM Journal of Heat Treatment and Materials

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The impact of plasma nitriding on the microstructure and the hardness of a recently developed 4 wt.-% medium manganese steel are presented. In contrast to standard quench and tempering steels, the investigated material achieves its martensitic microstructure by air-cooling from the forging heat, which enables the reduction of the carbon footprint of the forged components. The influence of nitriding on this grade of steel has not been investigated so far, but fundamental differences in comparison to standard nitriding steels are expected due to the increased manganese concentration. To address this issue, nitriding treatments with different temperatures (350 °C, 580 °C and 650 °C) have been performed, followed by examinations of the microstructure, the phase composition, the obtained hardness profiles and the tensile properties of the bulk material after nitriding, accompanied by thermodynamic equilibrium calculations. It is demonstrated that after nitriding at 580 °C similar hardness profiles like standard nitriding steels are achieved, with a shorter process as austenitization and hardening were omitted, reaching a hardness of approximately 950 HV0.1. Furthermore, it was demonstrated that austenite can be stabilized by manganese and nitrogen partitioning to room temperature during nitriding in the intercritical phase region.

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Influences of Vanadium and Silicon on Case Hardness and Residual Stress of Nitrided Medium Carbon Steels

Cited by 5 publications

References 44 publications

Interaction of N with White-solidified Cast Iron Model Alloys: The Effect of Mn and Cu on the Formation of Fe and Si Nitrides

Interaction of N with White-solidified Cast Iron Model Alloys: The Effect of Mn and Cu on the Formation of Fe and Si Nitrides

Improving the fatigue performance of vanadium and silicon alloyed medium carbon steels after nitriding through increased core fatigue strength and compressive residual stress

Plasma Nitriding of an Air-Hardening Medium Manganese Forging Steel

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