Ion nitrided AISI H13 tool steel Part I – Microstructural aspects

Cruz, M. R.; Nachez, Lucas; Nosei, L.; Feugeas, J.; Staia, M.H.

doi:10.1179/174329406x126663

Cited by 13 publications

(14 citation statements)

References 18 publications

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“…Among these, one can single out the role of the (possibly varying with treatment time) nitrogen concentration at the material surface and the nitride precipitation kinetics of iron and alloying elements such as chromium, molybdenum and vanadium, which profoundly influence the nitriding "effect". 3,4,5 If local equilibrium prevails at the surface, the nitrogen concentration in the solid at the surface is determined by the chemical potential of nitrogen in the nitriding atmosphere. This thermodynamic parameter is crucial for (control of) the efficiency of the nitriding process, also under non-equilibrium conditions.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of tool steel after low temperature ion nitriding

Zagonel

Mittemeijer

Alvarez

2009

Materials Science and Technology

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The microstructural development in H13 tool steel upon nitriding by an ion beam process was investigated. The nitriding experiments were performed at a relatively low temperature of about 400 ºC and at constant ion beam energy (400 eV) of different doses in a high-vacuum preparation chamber; the ion source was fed with high purity nitrogen gas. The specimens were characterized by X-ray photoelectron spectroscopy (XPS), electron probe microanalysis (EPMA), scanning and transmission electron microscopy (SEM and TEM), and grazing incidence and Bragg-Brentano X-ray diffractometry. In particular, the influence of the nitrogen surface concentration on the development of the nitrogen concentration-depth profile and the possible precipitation of alloying element nitrides were discussed.

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Section: Introductionmentioning

confidence: 99%

Microstructure of tool steel after low temperature ion nitriding

Zagonel

Mittemeijer

Alvarez

2009

Materials Science and Technology

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“…In Figure 5 in the diffractogram of the post-oxidized plasma nitrided pin, the presence of the magnetite (Fe 3 O 4 ) phase, hematite (Fe 2 O 3 ) phase, ε-Fe 2-3 N (hexagonal compact) and γ'-Fe 4 N (face-centered cubic) [21,22] could be observed. The significant presence of the hematite phase, the poorest oxide phase in tribological properties was also verified [5].…”

Section: Resultsmentioning

confidence: 97%

Tribological evaluation of duplex treatment of plasma nitriding/ oxidation applied to injection mold extraction system

Reis¹,

Dotta²,

Farias³

et al. 2020

Tecnol. Metal. Mater. Min.

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This work analyzes the application of surface treatment of plasma nitriding with post-oxidation applied to injection mold extractor pins to reduce the injection cycle's interruptions for mold lubrication. For that, a device that simulates the operation of the injection mold extraction system was created. Wear was evaluated by mass loss and dimensional variation of the extraction pins and their bushings. The samples were characterized by microhardness and X-ray diffraction (XRD). The wear mechanisms were identified by scanning electron microscopy (SEM) and the coefficient of friction was analyzed employing a ball-on-plate tribological test. The results showed that the proposed system with plasma nitriding and postoxidation meets the requirements with a lubrication interval twice as long as the current system.

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“…005 (Ref. 8). Figure 6a and b shows the presence of a small amount of debris which generated a mild abrasive wear mechanism.…”

Section: Room Temperature Testsmentioning

confidence: 99%

Ion nitrided AISI H13 tool steel Part 2 – High temperature performance under sliding wear conditions

Cruz

Staia

2006

Surface Engineering

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In the present work, study on a systematic variation of the processing parameters such as gas mixture, time of nitriding and current density has been carried out in order to determine how these will influence the sliding wear behaviour of plasma nitrided layers on AISI H13. Optical profilometry and scanning electron microscopy were used to characterise the worn sample and to determine the wear mechanism. The results revealed a strong influence of the current density on the formation of different diffusion and nitrided layers, which explained the wear behaviour of the studied samples, especially for those tested at room temperature. It was found that the wear volume of the nitrided samples without the existence of a compound layer was y200 times smaller than the wear volume of the untreated samples and nearly seven times smaller than the wear volume of nitrided samples when the compound layer was present. When the tests were carried out at 300uC, the wear behaviour was worse for the nitrided samples than for the untreated ones, owing to the formation of higher amount of debris as a consequence of the breakdown of the compound layer and the subsequent removal of the enriched Cr-N from the ferritic matrix, generating a severe abrasion wear mechanism. All the samples tested at 600uC presented a similar tribological behaviour irrespective of the processing parameters values chosen for nitriding, as a consequence of the formation of a uniform and 'lubricious' iron oxide layer which, however, was insufficient to protect the steel against wear at this temperature to the levels which were obtained for the samples tested at room temperature.

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Ion nitrided AISI H13 tool steel Part I – Microstructural aspects

Cited by 13 publications

References 18 publications

Microstructure of tool steel after low temperature ion nitriding

Microstructure of tool steel after low temperature ion nitriding

Tribological evaluation of duplex treatment of plasma nitriding/ oxidation applied to injection mold extraction system

Ion nitrided AISI H13 tool steel Part 2 – High temperature performance under sliding wear conditions

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