Relation microstructure-endommagement dun acier à outil de travail à froid

Belaid, M.; Fares, Mohamed Lamine; Khettache, Abdelkader; Saker, Abdelhadid

doi:10.3166/acsm.29.5.25-35

Cited by 3 publications

(7 citation statements)

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“…7, oxygen diffused into the steel and combined with certain alloying elements, in particular chromium and manganese. [37,39] In order to evaluate the results, data obtained by FNC, carbonitriding and heat treatments [2] are summarized in Table 5. Initially, the relationship between weight losses, hardness distribution profiles with nitrocarburizing time can be clearly deduced.…”

Section: Microhardness and Weight Lossmentioning

confidence: 99%

“…The microhardness depth profiling and the weight loss are also evaluated and are compared with those of samples subject to thermal treatment previously published. [2] …”

Section: Introductionmentioning

confidence: 99%

“…In general, the resulting damage configurations are abrasion, erosion, surface fatigue and corrosion. In a previous work, [2] it was proposed to improve tool's mechanical characteristics through appropriate conventional heat treatments (quenching-tempering). Significant results, relating to hardening by martensitic transformation and precipitation, were obtained.…”

Section: Introductionmentioning

confidence: 99%

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

Fares

Touhami

Belaid

et al. 2008

Surface & Interface Analysis

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Generally, tool steels for cold work are obtained by rolling and forging processes. They are treated to have a structure conferring to the material a high toughness limit in terms of wear resistance and endurance. The objective of this study is the thermochemical heat treatment of industrial steel blades made of AISI 02 types, intended for polymer crushing. The effects of nitrocarburizing (Tenifer) and gaseous carbonitriding processes on surface characteristics are considered. These surface treatments increase the usefulness of properties, that is, fatigue strength, wear and corrosion resistance of this microalloyed steel. The influence of treatment duration and the thickness of the layers on surface properties are investigated. The analysis and characterization are carried out using physical analysis [optical microscopy, scanning electron microscopy, X-ray diffraction and glow discharge optical emission spectroscopy (GDOES) techniques] and mechanical measurements (microhardness, weight loss and residual stresses) of treated material. The results are intended to contribute in defining and optimizing the adequate choice of treatments for this type of steel in industrial conditions.

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Section: Microhardness and Weight Lossmentioning

confidence: 99%

“…The microhardness depth profiling and the weight loss are also evaluated and are compared with those of samples subject to thermal treatment previously published. [2] …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Fares

Touhami

Belaid

et al. 2008

Surface & Interface Analysis

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“…In previous works, heat treatments such as quenching and tempering were considered in order to improve both hardness and lifetime of such steel. [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.…”

Section: Introductionmentioning

confidence: 99%

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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“…As the current studied steel is iron‐based alloys with high carbon content, one of the main remedies for these issues is conventional heat treatments [6]. Accordingly, a homogeneous microstructure consisting of a hardened matrix with acceptable mechanical characteristics, in terms of hardness/toughness and dimensional stability, has been achieved thanks to conventional heat treatments [7]. However, this prospect remains insufficient for the tool edge retention.…”

Section: Introductionmentioning

confidence: 99%

Surface characterization of a modified cold work tool steel treated by powder‐pack boronizing

Belaid

Fares

Assalla

et al. 2022

Materialwissenschaft Werkst

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The present work examines the effects of pack‐boronizing treatment on the surface characteristics of modified industrial cold‐work tool steel intended for polymer crushing. Particular attention is paid to optimizing the process parameters to improve the tool surface properties and thus achieve a satisfactory tool life. To this end, a series of samples were subjected to boronizing treatment within the temperature range from 800 °C to 1000 °C for soaking periods of 2 h, 4 h, 6 h and 8 h. The structural and mechanical properties of the modified metal surface were analyzed using optical and scanning electron microscopy, x‐ray diffraction, microhardness testing and pin‐on‐disk tribotesting. The adhesion quality of the boride layer‐substrate was carried out using the adhesion test Daimler Benz Rockwell‐C. The corrosion properties were determined by the electrochemical polarization method. Experimental results showed that the optimum temperature‐temporal conditions of 900 °C/4 h that are the intermediate processing parameters led to a better compromise between the intended properties, in terms of resistance to wear and corrosion, as well as adhesion quality.

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Relation microstructure-endommagement dun acier à outil de travail à froid

Cited by 3 publications

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

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

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

Surface characterization of a modified cold work tool steel treated by powder‐pack boronizing

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Relation microstructure-endommagement dun acier à outil de travail à froid

Cited by 3 publications

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

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

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

Surface characterization of a modified cold work tool steel treated by powder‐pack boronizing

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Relation microstructure-endommagement dun acier à outil de travail à froid