Defect-dependent nitride surface layer development upon nitriding of Fe–1 at.% Mo alloy

Selg, H.; Bischoff, E.; Bernstein, I.; Woehrle, Thomas; Meka, Sai Ramudu; Schacherl, R. E.; Waldenmaier, T.; Mittemeijer, E. J.

doi:10.1080/14786435.2013.765983

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…Section III-C). A (near) N-W OR has been reported before for the c¢ developed in the ferrite matrix of nitrided Fe-Mo, [33] nitrided Fe-Al [32] and a hypoeutectoid Fe-N alloy. [61] The formation of c¢ with a N-W OR with the ferrite matrix is associated with the occurrence of different morphologies for the c¢ phase.…”

Section: Discussionmentioning

confidence: 69%

“…[27] Whereas in the presence of strong nitride-forming alloying elements, such as Cr, V and Ti, the usual layer-type growth of iron nitride is observed, [28][29][30] weak nitride-forming alloying elements, such as Al and Mo, induce an unusual (e.g., plate-like) morphology of the formed iron nitride. [31][32][33] Usually steel contains Si: it is an important de-oxidizer for steel melts and an important alloying element in transformation-induced plasticity (TRIP), bainitic and electrical steels. [34,35] After the first demonstration that silicon nitride precipitates in ferrite in a highly unusual amorphous state, [36] only recently have the kinetics of this amorphous silicon nitride precipitation been investigated more extensively.…”

Section: Introductionmentioning

confidence: 99%

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Unusual Iron Nitride Formation Upon Nitriding Fe-Si Alloy

Meka

Schubert

Bischoff

et al. 2020

Metall Mater Trans A

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The influence of Si, substitutionally dissolved in ferritic Fe-2 at. pct Si and Fe-4.5 at. pct Si alloys, on the nucleation and growth of c¢ iron nitride upon controlled gaseous nitriding was investigated. The nitrided specimens were characterized by XRD, light microscopy, TEM, EELS, EPMA and EBSD. The combination of difficult and thus delayed precipitation of (1) silicon nitride, because of a large misfit with the ferrite matrix, and (2) c¢ iron nitride, because of the negligible solubility of Si, was shown to lead to a series of unusual, nonequilibrium phenomena: high nitrogen supersaturation, development of Si-containing metastable c¢ phase of peculiar morphology, precipitation of amorphous silicon nitride in c¢ and development of e nitride at thermodynamic conditions unlikely to allow its formation.

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Section: Discussionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Unusual Iron Nitride Formation Upon Nitriding Fe-Si Alloy

Meka

Schubert

Bischoff

et al. 2020

Metall Mater Trans A

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“…[3][4][5][6][7][8] In addition, the influence of alloying elements on the developing iron nitride layers on ferritic steel substrates has been investigated extensively. [9][10][11][12] The growth of iron-nitrogen (expanded) austenite layers on austenitic steel substrates has been studied. 1,[13][14][15][16] However, the role of alloying elements in the steel matrix as potentially influencing the resulting nitrided microstructure, in a dramatic way, by a change of the crystal structure of the nitrided matrix, has not received distinct attention until now.…”

Section: Introductionmentioning

confidence: 99%

Generating duplex microstructures by nitriding; nitriding of iron based Fe–Mn alloy

Meka

Chauhan

Steiner

et al. 2016

Materials Science and Technology

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Nitriding of Fe–2 at-%Mn alloy at 650°C employing a nitriding potential of 0·05 atm− 1/2 resulted in a highly complex microstructural development as a function of depth below the specimen surface: a surface adjacent layer exhibiting an austenite–martensite duplex microstructure, followed by an intermediate region showing a ferrite–austenite duplex microstructure, and at even larger depths a region where an austenite layer covers the grain boundaries of the ferrite matrix grains. Development of this complex microstructure is attributed to the strong austenite stabilising effects of Mn and N. This work demonstrates the power of a relatively simple nitriding treatment to realise a highly complex microstructure known to be associated with strongly enhanced mechanical properties.

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“…The fatigue performances of the superficially treated parts depend closely on the hardened layers quality: the metallurgical structure, the hardening and the residual stresses state. [3][4][5][6][7][8][9] The surfaces preparation mode before nitriding, the surface layers preliminary characteristics and their eventual effect on the resistance to fatigue were not approached in the literature. Indeed the initial state of surfaces and superficial layers before nitriding treatment was seldom described in the total of the references concerning the nitriding treatments.…”

Section: Introductionmentioning

confidence: 99%

Effects of Surface Pre-treatment on the Nitrided Layers Properties

Terres¹

2017

AJMIE

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Abstract:In this work the 42CrMo4 steel ground surface integrity was evaluated at different grinding conditions before and after nitriding. An experimental study was carried out to investigate the influence of depth of cut on work piece surface integrity by grinding. Surface integrity was characterized by roughness, micro-hardness, residual stress distribution and ground surface morphology. These properties were compared to nitriding state. These improvements in grindability and in surface integrity are particularly favoured by low depth of cut values. It is also shown that these improvements are essentially due to the reduction of the grinding temperature, which decrease the tensile residual stresses and favours the material removal by shearing and limits the ground surface damage. The roughness of the ground work piece surfaces increases with the depth of cut, which was attributed to plastically deformed coatings on the work piece surface occurring with elevated temperature. The results presented in this study shows that the material history before nitriding does not have any influence on the residual stresses distribution after nitriding. This is due to that during the nitriding treatment, especially in the heating phase; the tensile stresses generated by grinding are cancelled under the temperature effect.

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Defect-dependent nitride surface layer development upon nitriding of Fe–1 at.% Mo alloy

Cited by 9 publications

References 26 publications

Unusual Iron Nitride Formation Upon Nitriding Fe-Si Alloy

Unusual Iron Nitride Formation Upon Nitriding Fe-Si Alloy

Generating duplex microstructures by nitriding; nitriding of iron based Fe–Mn alloy

Effects of Surface Pre-treatment on the Nitrided Layers Properties

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