Effect of ion nitriding on fatigue behaviour of AISI 4140 steel

Genel, Kenan; Demirkol, Mehmet; Çapa, Mehmet

doi:10.1016/s0921-5093(99)00689-9

Cited by 150 publications

(84 citation statements)

References 16 publications

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“…The results presented for nitrided samples validate the above discussion. Clearly, the triode plasma nitriding and oxynitriding treatments create direct compressive stresses at the surface of the treated Ti alloy, which could be of significant importance to the fatigue behaviour of Ti-6Al-4V since they effectively reduce the maximum surface tensile stress experienced during the rotating-bending tests [43]. This normal stress is also accompanied by low-magnitude shear stresses; however, these have been observed to vary only slightly between all diffusion treated samples and typically lie between 55 and 85 MPa.…”

Section: Residual Stress Analysismentioning

confidence: 99%

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Cassar

Wilson²,

Banfield

et al. 2011

International Journal of Fatigue

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a b s t r a c tThe effect of triode-plasma enhanced low-pressure oxygen and/or nitrogen diffusion treatments, either as a single process or in conjunction with plasma-assisted physical vapour deposition (PAPVD) on Ti6Al-4V has been studied under rotating-bending fatigue testing. Following the diffusion treatment, samples exhibit a hardened case, more than 30 lm deep. Semi-logarithmic S-N plots are used to demonstrate and compare the significant changes in fatigue resistance obtained from each process. Fractography and residual stress measurements show that, compared to annealed samples, the fatigue strength of the diffusion-treated samples was superior; although the result changed depending on the processing parameters and microstructure of the substrate material. Also, unsupported and mechanically uncompliant ceramic coatings, such as TiN, promote the initiation of multiple crack sites, which lead to premature failure of the Ti-alloy substrate and a consequent reduction in endurance limit.

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Section: Residual Stress Analysismentioning

confidence: 99%

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Cassar

Wilson²,

Banfield

et al. 2011

International Journal of Fatigue

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“…Although a significant number of studies have been carried out on fatigue and corrosion behaviour of high strength steels, most of these studies were carried out in 3.5% NaCl solutions [46,[48][49][50][51][52][53] in boiling sodium hydroxide [54], in gaseous hydrogen [55]. Fatigue behaviour of 4140 has also been investigated on the effect of magnetic treatment [56] and on the effect of ion nitriding [57]. However, not much information is available in literature on the influence of dissolved hydrogen (ex situ hydrogen charging) on the fatigue crack growth behaviour of AISI 4140 steel.…”

Section: Hydrogen Embrittlement Mechanismsmentioning

confidence: 99%

Influence of dissolved hydrogen on the fatigue crack growth behaviour of AISI 4140 steel

Nagarajan

2014

International Journal of Fatigue

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“…There is still an interest in studying the properties of AISI 4140 steel. The main concern of these studies is improving the mechanical performance of the material using surface treatment [49][50], corrosion resistance [51], wear behaviour [52,53,54], microstructure [55], fatigue life [56,57,58,59,60] and other investigations [61]. However, the studies on the effects of salt bath nitriding on AISI 4140 steel and the variations in surface roughness parameters of the nitrided layer are very scarce.…”

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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Effect of ion nitriding on fatigue behaviour of AISI 4140 steel

Cited by 150 publications

References 16 publications

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Influence of dissolved hydrogen on the fatigue crack growth behaviour of AISI 4140 steel

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

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