Effect of process time on structural and tribological properties of ferritic plasma nitrocarburized AISI 4140 steel

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

doi:10.1016/j.matdes.2003.10.017

Cited by 49 publications

(24 citation statements)

References 15 publications

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“…For each specimen, surface roughness was determined by five measurements and the average was plotted. the material, As expected in [63,64,65,66,67]. A white layer of a few microns thickness and a relatively thick diffusion layer were formed at the surface.…”

Section: Microstructure and Microhardness And Surface Roughness Measusupporting

confidence: 74%

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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Section: Microstructure and Microhardness And Surface Roughness Measusupporting

confidence: 74%

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

Ghelloudj

Hannachi

Djebaili

2017

Acta Metall Slovaca

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“…On all the treated specimens an increasein hardness with temperature was found. Between the two treatments plasma nitrocarburizing has yielded a higher hardness values at all these temperatures mainly due the carbon and nitrogen saturated expanded austenite at 400 C and the presence of carbonitrides above 400 C [34]. It was interesting to note that the microhardness of ferrite phase was harder than the austenite phase despite the fact that ferrite phase of the untreated specimen was softer than the austenite phase.…”

Section: Surface Roughness and Microhardnessmentioning

confidence: 98%

Study of plasma nitriding and nitrocarburizing for higher corrosion resistance and hardness of 2205 duplex stainless steel

2015

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“…Different approaches have been proposed and studied to produce better surface properties with nitrogen and carbon inclusion via plasma techniques, including pulsed plasma, r.f. plasma, and plasma immersion ion implantation [7][8][9][10][11]. These studies used plasmas composed of nitrogen gas (sometimes diluted in hydrogen gas) and, for carbon carrying gas, carbon dioxide, or some hydrocarbon gas such as methane or acetylene.…”

Section: Introductionmentioning

confidence: 99%

Tool steel ion beam assisted nitrocarburization

Zagonel

Alvarez

2007

Materials Science and Engineering: A

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The nitrocarburization of the AISI-H13 tool steel by ion beam assisted deposition is reported. In this technique, a carbon film is continuously deposited over the sample by the ion beam sputtering of a carbon target while a second ion source is used to bombard the sample with low energy nitrogen ions. The results show that the presence of carbon has an important impact on the crystalline and microstructural properties of the material without modification of the case depth.

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Effect of process time on structural and tribological properties of ferritic plasma nitrocarburized AISI 4140 steel

Cited by 49 publications

References 15 publications

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

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

Study of plasma nitriding and nitrocarburizing for higher corrosion resistance and hardness of 2205 duplex stainless steel

Tool steel ion beam assisted nitrocarburization

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