Determination of Stress Profiles in Expanded Austenite by Combining Successive Layer Removal and GI-XRD

Fernandes, Frederico Augusto Pires; Christiansen, Thomas; Somers, Marcel A. J.

doi:10.4028/www.scientific.net/amr.996.155

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…[8,28] Nevertheless, huge compressive stress levels in excess of 7 GPa as reported for nitrided AISI 316 cannot be understood and have recently been attributed to the application of inappropriate elastic constants and grain-interaction models. [29] B. Effect of Prior Deformation on Nitriding Behavior…”

Section: A Mechanical Properties and Microstructure Of As-deformed Mmentioning

confidence: 99%

Influence of Plastic Deformation on Low-Temperature Surface Hardening of Austenitic Stainless Steel by Gaseous Nitriding

Bottoli

Winther

Christiansen

et al. 2015

Metall Mater Trans A

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This article addresses an investigation of the influence of plastic deformation on low-temperature surface hardening by gaseous nitriding of two commercial stainless steels: EN 1.4369 and AISI 304. The materials were plastically deformed to several levels of equivalent strain by conventional tensile straining, plane strain compression, and shear. Gaseous nitriding of the strained material was performed in ammonia gas at atmospheric pressure at various temperatures. Microstructural characterization of the as-deformed state and the nitrided case produced included X-ray diffraction analysis, reflected-light microscopy, and microhardness testing. The results demonstrate that a case of expanded austenite develops and that the presence of plastic deformation has a significant influence on the morphology of the nitrided case. The presence of strain-induced martensite favors the formation of CrN, while a high dislocation density in a fully austenitic structure does not lead to such premature nucleation of CrN.

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Section: A Mechanical Properties and Microstructure Of As-deformed Mmentioning

confidence: 99%

Influence of Plastic Deformation on Low-Temperature Surface Hardening of Austenitic Stainless Steel by Gaseous Nitriding

Bottoli

Winther

Christiansen

et al. 2015

Metall Mater Trans A

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“…This may be caused by the weak Ni-N repulsion with slightly decreases the solubility of N in γ N (see in this respect [42][43][44], where it is observed that a high Ni content limits the N solubility in the alloys 2 ). These lattice parameter values are affected by both the composition and the occurrence of compressive residual stresses [45]. The lattice parameter of original alloys is also plotted in the Fig.…”

Section: Evolution Of Lattice Parameters In γ N and γ' Nmentioning

confidence: 99%

Co-existence of γ'N phase and γN phase on nitrided austenitic Fe–Cr–Ni alloys- I. experiment

et al. 2019

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“…L 0 22 (41) Since there are now both a plastic region from the surface to a depth z pl and an elastic region from z pl to the maximum depth, L, the integral is split as follows Assuming constant material parameters (E, ν) and inserting the expressions for the stress in elastic (equation ( 39)) and the plastic regions (equation ( 38)) in equation ( 43) gives…”

Section: Plastic Accommodation Of Stressmentioning

confidence: 99%

“…Bottoli, et al [40] investigated two qualities of austenitic stainless steel deformed to various degrees of equivalent strain, and found that the Vickers hardness (HV) and yield stress Realizing that hardness and yield stress both are a measure of the resistance against plastic deformation, it is attempted to obtain an estimate for the concentration dependence of the yield stress from the hardness. Correlating hardness-depth and concentration-depth profiles for nitrided AISI 316 austenitic stainless steel from [41] and converting hardness into yield stress with Eq. A-15, the dependence displayed in Fig.…”

Section: A5-concentration Dependent Yield Stressmentioning

confidence: 99%

Modelling the evolution of composition-and stress-depth profiles in austenitic stainless steels during low-temperature nitriding

Jespersen¹,

Hattel²,

Somers³

2016

Modelling Simul. Mater. Sci. Eng.

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Nitriding of stainless steel causes a surface zone of expanded austenite, which improves the wear resistance of the stainless steel while preserving the stainless behavior. During nitriding huge residual stresses are introduced in the treated zone, arising from the volume expansion that accompanies the dissolution of high nitrogen contents in expanded austenite.An intriguing phenomenon during low-temperature nitriding is that the residual stresses evoked by dissolution of nitrogen in the solid state, affect the thermodynamics and the diffusion kinetics of nitrogen dissolution. In the present paper solid mechanics was combined with thermodynamics and diffusion kinetics to simulate the evolution of composition-depth and stress-depth profiles resulting from nitriding. The model takes into account a composition-dependent diffusion coefficient of nitrogen in expanded austenite, short range ordering (trapping) of nitrogen atoms by chromium atoms, and the effect of composition-induced stress on surface concentration and diffusive flux. The effect of plasticity and concentrationdependence of the yield stress was also included.

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Determination of Stress Profiles in Expanded Austenite by Combining Successive Layer Removal and GI-XRD

Cited by 8 publications

References 17 publications

Influence of Plastic Deformation on Low-Temperature Surface Hardening of Austenitic Stainless Steel by Gaseous Nitriding

Influence of Plastic Deformation on Low-Temperature Surface Hardening of Austenitic Stainless Steel by Gaseous Nitriding

Co-existence of γ'N phase and γN phase on nitrided austenitic Fe–Cr–Ni alloys- I. experiment

Modelling the evolution of composition-and stress-depth profiles in austenitic stainless steels during low-temperature nitriding

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