The investigation of mechanical properties of ion-nitrided AISI 5140 low-alloy steel

Alsaran, Akgün; Karakan, Mehmet; Çelik, A.

doi:10.1016/s1044-5803(02)00275-9

Cited by 62 publications

(39 citation statements)

References 8 publications

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“…It should be observed that, while the compound layer provides a better corrosion resistance [1,2], the diusion zone concentrates the load bearing capacity and fatigue strength [3,4]. Then long treatments weaken the surface hardness and a deeper diusion layer the wear [5].…”

Section: Introductionmentioning

confidence: 99%

Nitriding of 4140 Annealed Low Alloy Steel in RF Plasma

et al. 2013

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The annealed low alloy 4140 steel samples have been nitrided for dierent treatment periods (16 h) in an RF inductive plasma discharge with very low bias voltage (≈ 400 V). The resulting nitrided layer has been observed by means of an optical microscope whereas the nitride phases have been characterised by X-ray analysis. The corrosion response, assessed by the potentiodynamic tests in the 3.5% NaCl solution, presents both higher noble potential values and lower corrosion rates when compared with the untreated sample. The Vickers microhardness tests values show an appreciable increment compared to that of the untreated sample. The process is characterized by a high overall eciency because similar average Vickers tests values were obtained, no matter for how long the treatment was extended. Likewise, the scanning electron micrographs conrmed no appreciable size evolution of the compound layer microstructure at dierent times of treatment.

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Section: Introductionmentioning

confidence: 99%

Nitriding of 4140 Annealed Low Alloy Steel in RF Plasma

et al. 2013

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“…At longer times, the precipitate particles are larger in size and more prone to coarsening, leading to a lower precipitate density and hence lower hardness [27,28]. The depth increases with increasing time and temperature [29]. The higher depth values of the case depth are obtained as the treatment time increases.…”

Section: Microhardnessmentioning

confidence: 99%

The Influence of Salt Bath Nitriding Variables on Hardness Layer of Aisi 1045 Steel

Ghelloudj¹,

Djebaili²,

Hannachi³

et al. 2016

Acta Metall Slovaca

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The aim of this paper is to study and analyze the effects of a surface controlled salt bath nitriding on the microhardness of AISI 1045 steel. 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 (520ºC). The nitriding process repeated of other specimens at the same times, but the temperature was (580ºC).The microstructure of the surface layers was investigated by scanning electron microscopy (SEM) and optical microscopy. Hardness profiles were measured with lowload hardness testing to determine the growth of the case depth after nitriding. Microhardness testing was carried out on samples to investigate the hardness profile at the transition from the compound to the diffusion layer. The microhardness of the surface of the nitrided sample at 520ºC and 580ºC was observed in the range of 318-430 HV0.3 and 329-421 HV0.3, respectively. Experimental results showed that the nitrides ε-Fe2-3(N, C) and γ'-Fe4(N,C) present in the compound layer increase the microhardness , It also showed that the Increasing the salt bath nitriding parameters (treatment time and temperature) increases the surface hardness and hardness profile.

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“…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]. DOI There's plenty of research that aims to predict the behaviour of steel after nitriding treatments, AISI 5140 [20][21][22][23][24][25], AISI 430 [21], AISI 1045 [22], AISI 4340 [23], AISI 410 [24], API X-65 [26], Fe-Cr alloys [27] and examine changes in the resulting structures of treatment nitrided components by plasma nitriding [28,29,32,33], ion nitriding [30,31,34], plasma nitrocarburizing [35] and salt bath nitriding [5]. On the other hand there's many studies interested to study surface roughness [36,37,38,39,40,41], methods of measurement of surface roughness parameters [43,44,45,47] and others [42,46,48].…”

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].

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The investigation of mechanical properties of ion-nitrided AISI 5140 low-alloy steel

Cited by 62 publications

References 8 publications

Nitriding of 4140 Annealed Low Alloy Steel in RF Plasma

Nitriding of 4140 Annealed Low Alloy Steel in RF Plasma

The Influence of Salt Bath Nitriding Variables on Hardness Layer of Aisi 1045 Steel

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

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