Nanomechanical characterization of the hydrogen effect on pulsed plasma nitrided super duplex stainless steel

Asgari, Masoud; Johnsen, Roy; Barnoush, Afrooz

doi:10.1016/j.ijhydene.2013.08.137

Cited by 24 publications

(9 citation statements)

References 40 publications

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“…Investigations of Asgari et al [18] on super duplex stainless steels with a chemical composition more comparable with our high-alloy TRIP steel determined an indentation hardness of 4.5 GPa both for the austenitic and the ferritic phase. In both papers [17,18], the nanoindentation experiments were performed on undeformed material states. However, in [17], the carbon content is as high that the higher indentation hardness of the martensitic phase can result both from interstitial hardening as well as from the small grain size.…”

supporting

confidence: 75%

“…These authors found an average indentation hardness of about 7 GPa for martensite with a mean grain size of 1.4 μm [17]. Investigations of Asgari et al [18] on super duplex stainless steels with a chemical composition more comparable with our high-alloy TRIP steel determined an indentation hardness of 4.5 GPa both for the austenitic and the ferritic phase. In both papers [17,18], the nanoindentation experiments were performed on undeformed material states.…”

supporting

confidence: 48%

“…The authors expect that the small martensitic nuclei with dimensions in the sub-micrometre range yield a so-called dynamical Hall-Petch effect [9] known already from the mechanical twinning in TWinning Induced Plasticity steels [10][11][12]. However, there are only few studies [13][14][15][16][17][18] investigating the nano-hardness of austenite and α'-martensite in TRIP steels in the literature. Figure 1a shows schematically the concurrent increase in strength and ductility for TRIP steels compared with stable austenitic steel.…”

Section: Introductionmentioning

confidence: 99%

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Nanoindentation measurements on deformation-induced α’-martensite in a metastable austenitic high-alloy CrMnNi steel

Weidner¹,

Hangen²,

Biermann³

2014

Philosophical Magazine Letters

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2014) Nanoindentation measurements on deformation-induced α'-martensite in a metastable austenitic high-alloy CrMnNi steel, Philosophical Magazine Letters, 94:8, 522-530,The hardness of deformation-induced α'-martensite and parent austenitic matrix in high-alloy CrMnNi steel was investigated by nanoindentation measurements inside scanning electron microscope using picoindenter. After the indentation, the microstructure was investigated by electron backscattered diffraction measurements. The hardness values for α'-martensite are only 24% higher than those of austenite. Thus, the increase in strength during the formation of deformation-induced α'-martensite is rather caused by the small grain size of α'-nuclei resulting in a dynamic Hall-Petch effect than by its "intrinsic" hardness.

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supporting

confidence: 75%

supporting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

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Nanoindentation measurements on deformation-induced α’-martensite in a metastable austenitic high-alloy CrMnNi steel

Weidner¹,

Hangen²,

Biermann³

2014

Philosophical Magazine Letters

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“…Indeed, given the complexity of the problem, a more direct approach of reducing hydrogen transport by a surface coating method might be considered more appealing. Other research groups have followed a similar approach and suggested electrodeposited coatings of Pb, Ni, or Bi; 1-4 surface nitriding, carburizing, or sulfurizing; [9][10][11][12][13][14] or other surface modification by aluminizing, shot peening, laser treatment, or plasma thin film deposition. [5][6][7][8] In those cases, as in the current case, the reduction of hydrogen ingress into metal alloys susceptible to hydrogen embrittlement can be demonstrated.…”

Section: Effect Of Nitriding On Mechanical Properties and Hydrogen Emmentioning

confidence: 99%

Effect of Nitriding on the Hydrogen Diffusion Coefficient through AISI 4340

Jebaraj

Morrison

McLaughlin

et al. 2014

J. Electrochem. Soc.

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The effect of plasma nitriding on hydrogen permeation through AISI 4340 was studied both experimentally and theoretically. Effective hydrogen diffusion coefficients were measured for three different AISI 4340 membrane specimens: as-received, nitrided, and nitrided specimens with the compound layer removed by mechanical abrasion. The as-received specimen had a higher diffusion coefficient (2.8 × 10 −6 cm 2 /sec) than the nitrided specimens. The nitrided specimen with the compound layer intact had a much lower hydrogen diffusion coefficient (0.65 × 10 −6 cm 2 /sec) than the specimen without the compound layer (1.9 × 10 −6 cm 2 /sec). These results demonstrate that the γ-Fe 4 N rich compound surface layer and the N that diffuses more deeply into AISI 4340 during plasma nitriding both reduce the effective hydrogen diffusion coefficient. Multiple permeation transients yield evidence for the presence of only reversible trap sites in as-received specimens and the presence of both reversible and irreversible trap sites in nitrided specimens, with and without the compound zone intact. In addition, density functional theory-based molecular dynamics simulations yield hydrogen diffusion coefficients through γ-Fe 4 N (1.5 × 10 −5 cm 2 /sec) one order of magnitude lower than through α-Fe (1.2 × 10 −4 cm 2 /sec), which supports the experimental measurements of hydrogen permeation.

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“…Intergranular cracking (IGC) is one of the most critical damage modes in the development of 17-4 pH steel [1]. Because of the harmful effect of IGC in high strength steels, numerous investigations have been performed [4][5][6]. Researchers have suggested several methods to reduce the probability of IGC such as adding micro-alloying elements [7,8], eliminating precipitations [9], and reducing segregations [10,11].…”

Section: Introductionmentioning

confidence: 99%

The role of microstructure and grain orientations on intergranular cracking susceptibility of UNS 17400 martensitic stainless steel

Masoumi

Tavares

Pardal

et al. 2017

Engineering Failure Analysis

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Nanomechanical characterization of the hydrogen effect on pulsed plasma nitrided super duplex stainless steel

Cited by 24 publications

References 40 publications

Nanoindentation measurements on deformation-induced α’-martensite in a metastable austenitic high-alloy CrMnNi steel

Nanoindentation measurements on deformation-induced α’-martensite in a metastable austenitic high-alloy CrMnNi steel

Effect of Nitriding on the Hydrogen Diffusion Coefficient through AISI 4340

The role of microstructure and grain orientations on intergranular cracking susceptibility of UNS 17400 martensitic stainless steel

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