Effect of D.C. electric field on salt bath nitriding for 35 steel and kinetics analysis

Zhou, Zhengshou; Dai, Mingyang; Shen, Zhiyuan; Hu, Jing

doi:10.1016/j.jallcom.2014.10.146

Cited by 23 publications

(4 citation statements)

References 19 publications

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“…The data linearity for temperatures of 703K, 723K and 743K suggests that low-temperature liquid nitrocarburizing is a diffusion controlled process. The active energy Q can be used to predict the case thickness or to determine the treatment time and temperature for obtaining a predetermined case layer thickness [42]. layer is adjacent to H13 steel and the other flat side is adhere to aluminum.…”

Section: The Relationship Between Diffusion Coefficientmentioning

confidence: 99%

Combat molten aluminum corrosion of AISI H13 steel by low-temperature liquid nitrocarburizing

Chen

Wang

Fan

et al. 2019

Journal of Alloys and Compounds

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Section: The Relationship Between Diffusion Coefficientmentioning

confidence: 99%

Combat molten aluminum corrosion of AISI H13 steel by low-temperature liquid nitrocarburizing

Chen

Wang

Fan

et al. 2019

Journal of Alloys and Compounds

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“…For instance, gas nitriding, salt bath nitriding, plasma nitriding, laser accumulating operation, reactive magnetron spraying (injecting), nitrogen implanting and plasma [11]. The primary aim of the process of salt bath nitriding (SBN) [12] is to obtain high surface hardness, improve mechanical properties and increase wear resistance, fatigue life, dimensional stability and corrosion resistance as a result of the presence of compounds formed at the surface, in addition to a zone of diffused nitrogen in solid solution with the base material, subjacent to the compound layer [13,14,15]. Nitriding is one type of the most widely used thermo-chemical treatments in the industry, which produces strong and shallow case with high compressive residual stresses on the surface of steel components such as gears, crankshafts, dies and tools [16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Time on the Compound Layer Formed During Salt Bath Nitriding of Aisi 4140 Steel

Ghelloudj

Tahar

Djebaili

2018

Acta Metall Slovaca

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<p class="AMSmaintext">This research was carried out to study the effect of time on the compound layer of AISI 4140 steel in salt bath nitriding. The nitriding process were implemented on AISI 4140 steel in salt bath component for different times (from 1 h to 10 h) at 580 °C. Samples of AISI 4140 steel were treated and characterized (at surface and core of samples) through the following technique: optical microscopy, scanning electron microscopy, X-ray diffraction (XRD) and microhardness tester. Shows that thick compound layers are formed during continuous salt bath nitriding. The thickness of the compound layer and surface hardness increases with increasing time.</p>

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“…Salt bath nitriding [3,4,5] is one of the most widely used thermo-chemical methods [6,7,8], which produces strong and shallow case with high compressive residual stresses on the surface of steel components such as gears, crankshafts, dies and tools [9,10,11]. Surface roughness of industrial components strongly affects their performance, i.e, many surface properties such as friction [12][13], surface wear [14], fluid flow in rough pipes [15] and the functioning of vacuum seals [16] are strictly dependent on surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Effect of Salt Bath Nitriding on Surface Roughness Behaviour of Aisi 4140 Steel

Ghelloudj

Hannachi

Djebaili

2017

Acta Metall Slovaca

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In the present research, AISI 4140 steel was nitrided in salt bath to study and analyze the behaviour of the surface roughness. The structural surface characterization behaviour of the nitrided steel was compared to the behaviour of the same steel which was untreated. The nitriding process was implemented in the salt bath component at ten different times (from 1 h to 10 h) when the temperature was constant at (580ºC). The influence of nitriding treatment on structural properties of the material was studied by scanning electron microscopy (SEM), microhardness tester and surface profilometer. It was found that salt bath nitriding was effective in improving the surface properties behaviour of this steel. Experimental results showed that the nitrides ε-Fe2-3(N,C) and γ'-Fe4(N,C) present in the compound layer increase the microhardness (406-502 HV0.3), the initial surface roughness values of nitrided samples were higher than those of unnitrided specimens, it also observed that the increasing the nitriding time increases the surface roughness parameters (Ra, Rq and Rz).Keywords: salt bath nitriding, AISI 4140 steel, microhardness, surface roughness IntroductionSurface topography is an important characteristic that determines, among other things, catalytic activity, electrochemical potential, adhesion, friction coefficient, susceptibility to wear and scuffing failure and aesthetic appearance [1][2]. Salt bath nitriding [3,4,5] is one of the most widely used thermo-chemical methods [6,7,8], which produces strong and shallow case with high compressive residual stresses on the surface of steel components such as gears, crankshafts, dies and tools [9,10,11]. Surface roughness of industrial components strongly affects their performance, i.e, many surface properties such as friction [12][13], surface wear [14], fluid flow in rough pipes [15] and the functioning of vacuum seals [16] are strictly dependent on surface roughness. In addition, surface roughness seems to be important in bioengineering for example in the joints of the bones [17]. Quite often small roughness is desired since small roughness reduces wear and energy loss, but when high friction is needed also the roughness should be larger. Hence, the inspection of surface roughness of the work piece is very important to assess the quality of a component. The quality of surface roughness is an important requirement for coated parts [18]. There are at least five different mechanisms by using the surface modification methods to increase the fretting resistance: (1) to induce a residual compressive stress; (2) to decrease the coefficient of friction; (3) to increase the surface hardness; (4) to alter the surface chemistry; (5) to increase the surface roughness [19].

show abstract

Effect of D.C. electric field on salt bath nitriding for 35 steel and kinetics analysis

Cited by 23 publications

References 19 publications

Combat molten aluminum corrosion of AISI H13 steel by low-temperature liquid nitrocarburizing

Combat molten aluminum corrosion of AISI H13 steel by low-temperature liquid nitrocarburizing

Effect of Time on the Compound Layer Formed During Salt Bath Nitriding of Aisi 4140 Steel

Effect of Salt Bath Nitriding on Surface Roughness Behaviour of Aisi 4140 Steel

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