Surface characteristics analysis of nitrocarburized (Tenifer) and carbonitrided industrial steel AISI 02 types

Fares, Mohamed Lamine; Touhami, Mohamed Zine; Belaid, M.; Bruyas, H.

doi:10.1002/sia.2991

Cited by 25 publications

(19 citation statements)

References 34 publications

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“…For the effect of nitrocarburizing time, the N8 sample presents a Fe 3 N peak smaller than that of N6. [18] It is the same for sample N6O90 when compared to N8O90. The consideration of the combination of oxidation and nitrocarburizing times applies for the N8 sample which presents a Fe 3 N peak almost the same as that of N8O30 but larger than that of N8O90.…”

Section: Microstructure and Diffusion Mechanismmentioning

confidence: 68%

“…Abrasive wear tests were conducted by means of a pin-ondisc setup [18,21] and the pin-shaped specimens were forced to slide on fresh 800-mesh abrasive paper with an applied normal load of 2 N. The paper was fitted on a steel disc rotating at a speed of 14 cycles/min. This low angular speed is adjusted in order to establish the relative wear behaviour of the different phases at the immediate surface layers.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…[17] Additionally, thermochemical treatments such as nitrocarburizing in salt bath for 6 h have been successfully introduced to improve the surface characteristics. [18] In the present research, an investigation is carried out in order to provide improvements of corrosion, wear and strength resistance. Results of surface modifications after using salt bath nitrocarburizing for 6 h and 8 h at 570…”

Section: Introductionmentioning

confidence: 99%

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Post‐oxidizing effects on surface characteristics of salt bath nitrocarburized AISI 02 tool steel type

Fares¹,

Chaoui²,

Coze³

2009

Surface & Interface Analysis

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The effect of post-oxidizing treatment on the characteristics of modified surface layers produced by salt bath nitrocarburizing on the industrial American Iron and Steel Institute (AISI) 02 tool steel types is investigated. Nitrocarburizing treatment is performed for 6 h and 8 h at 570• C and post-oxidizing treatment for 30, 60 and 90 min at 520 • C, using argon-steam mixture. Formed layers are characterized by their basic properties such as thickness layer, depth, surface hardness and wear resistance. Detailed estimation of the modified metal surface quality, in terms of chemical composition, formed phases, microstructures and diffusion mechanisms are performed by metallographic techniques, EDX, X-ray diffraction, scanning electron microscopy (SEM) and glow discharge optical electron spectroscopy (GDOES). The corrosion resistance was investigated in 0.4 M H 2 SO 4 solutions, using steady-state electrochemical polarization methods. The obtained results revealed the existence of a superficial oxide layer which consists of magnetite (Fe 3 O 4 ) and hematite (Fe 2 O 3 ) and the presence of an ε-phase associated with a small amount of γ -phase. Important improvements in wear, microhardness and corrosion resistance occur after these treatments and it is specifically concluded that the sole application of a nitrocarburizing treatment does not significantly ameliorate the corrosion resistance of the as-received steel. In fact, post-oxidation treatment contributes to increase corrosion resistance by forming a dense magnetite layer and at the same time, it partially covers the compound layer pores.

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Section: Microstructure and Diffusion Mechanismmentioning

confidence: 68%

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Post‐oxidizing effects on surface characteristics of salt bath nitrocarburized AISI 02 tool steel type

Fares¹,

Chaoui²,

Coze³

2009

Surface & Interface Analysis

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“…When processing times are very long, high levels of retained austenite and case porosity may occur. 6 Formed cases can be harder than carburised cases, and they allow maintaining an appreciable hardness at higher service temperatures. Usually, quenching conditions will determine final characteristics, such as surface hardness, the type and properties of induced internal stresses and mechanical properties, such as torsional and tensile strengths.…”

Section: Introductionmentioning

confidence: 99%

Effects of gas carbonitriding process on surface characteristics of new hot working tool steel

Fares¹,

Talhi

Chaoui

et al. 2011

Surface Engineering

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Gaseous carbonitriding effects on improvement of surface characteristics of new hot working tool steel close to as either chromium AISI H11 or AISI H13 are investigated. Experimental results are related to three aspects: formed layers, microstructure and obtained precipitates. The formed layers are characterised by their basic properties, which are thickness, depth, formed phases, hardness and wear resistance. Microstructure and the diffusion mechanism suggested that high temperature gas carbonitriding process has the potential of improving the mechanical properties with shorter processing time. The arrangement of carbonitrides, nitrides, chromium oxides and retained austenite and Fe 3 C carbides allowed obtaining tool performance from the moderate low mass. Microstructural characterisations were performed by metallographic techniques, electron dispersive energy, X-ray diffraction techniques, optical and scanning electron microscopy and glow discharge optical electron spectroscopy. The mechanical properties were assessed mainly by standard hardness and wear tests.

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“…Da diese Stähle einen hohen Anteil an Nitrid bildenden Legierungselementen aufweisen, findet zusätzlich zur martensitischen Härtung beim Abkühlen eine Ausscheidungshärtung statt, da sich beim Carbonitrieren durch die zusätzliche Diffusion von Stickstoff in die Randschicht bei Überschreitung der Löslich-keit Legierungselement-Ausscheidungen, wie Nitride und Carbonitride, ausbilden können. Untersuchungen von Fares belegen, dass durch Carbonitrieren die Verschleißbeständigkeit des Kaltarbeitstahls 1.2842 verbessert werden kann [4]. Für Warmarbeitsstähle liegen bisher nur wenige Untersuchungen zum Carbonitrieren vor, z.…”

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Carbonitrieren von Warmarbeitsstählen*

Hoja

Skalecki

Klümper-Westkamp

et al. 2017

HTM Journal of Heat Treatment and Materials

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Kurzfassung/AbstractUm den hohen Beanspruchungen bei der Warmmassivumformung zu begegnen, werden die Randbereiche der eingesetzten Werkzeuge nitriert. In vorangegangenen Untersuchungen zu nitrierten Gesenken zeigte sich, dass die Verschleißtiefe an kritischen Stellen deutlich über der Nitrierhärtetiefe lag. Eine Steigerung der Nitrierhärtetiefe ist durch Nitrierdauern von mehreren hundert Stunden in den meisten Fällen jedoch unwirtschaftlich. In order to withstand the rough operation conditions, the surfaces and boundary areas of forging dies are nitrided. In former investigations of nitrided dies it was shown that the depth of abrasive wear at the critical parts of the dies is much deeper than the nitriding depth. However, a further increase in nitriding depth is, in most cases, uneconomic since it would require treatment times of several hundreds of hours. Another possibility to increase the wear resistance and heat resistance of the boundary layer is to use carbonitriding. The diffusion of carbon and nitrogen then occurs at higher temperatures so that deeper hardening depths can be obtained in economic treatment times. Carbonitriding is typically used for components made of un-or low-alloyed steels, with carbon contents lower than 0.25 %. The aim of the carbonitriding treatment is then an improvement of the properties like hardenability, surface hardness, wear resistance, fatigue strength, and tempering resistance of the carbonitrided layer allowing replacement of more expensive high-alloy steels. On the development of carbonitriding treatments for hot working tool steels the initial situation and the focus is completely different. The high contents of alloying elements allow formation of finely distributed nitrides and carbonitrides, which are stable at the elevated temperatures during service and which can improve the wear resistance. Although carbonitriding provides a high potential to improve properties of the surface area of hot working steels, there are only few investigations with this aim. The investigations of the present work concern the development of carbonitriding treatments for the hot working tool steels X38CrMoV5-3 and 55NiCrMoV7, aiming at generating finely distributed precipitations providing wear-resistant and thermally stable surface layers. n

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Surface characteristics analysis of nitrocarburized (Tenifer) and carbonitrided industrial steel AISI 02 types

Cited by 25 publications

References 34 publications

Post‐oxidizing effects on surface characteristics of salt bath nitrocarburized AISI 02 tool steel type

Post‐oxidizing effects on surface characteristics of salt bath nitrocarburized AISI 02 tool steel type

Effects of gas carbonitriding process on surface characteristics of new hot working tool steel

Carbonitrieren von Warmarbeitsstählen*

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