Influence of initial conditions on the mechanical behavior of ion nitrided AISI 4340 steel

Şirin, Şule Yıldız; Sirin, Kahraman; Kaluç, Erdinç

doi:10.1016/j.msea.2012.11.029

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…This can be as low as less than 0.25 µm during ion implantation where the case depths are shallow [67]. The minimum case depth which has been obtained by ion nitride of AISI 4340 steel at temperature of 500°C and nitriding time of 2 h is 280 µm [68,69]. The investigation by Chou [61] of AISI 4340 steel bars machined at 1.2 mm flank wear (VB) showed the hardened depth is about 30 µm.…”

Section: Resultsmentioning

confidence: 99%

Cryogenic milling and formation of nanostructured machined surface of AISI 4340

Muhamad

Ghani

Haron

et al. 2020

Nanotechnology Reviews

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Hardened layers are commonly required for automotive components after their production using a machining process in order to enhance the service life of these components. This study investigates the possibility of producing a nanostructured machined surface which can increase the hardness of the machined surface by varying the machining parameters under cryogenic conditions in end milling of AISI 4340. The end milling experiments were performed using multi-layered TiAlN- and AlCrN-coated carbide. Prior to the experiment, a finite element method (FEM) was used to simulate the cutting temperature generated and it had been found that at cutting speed of 200–300 m/min, feed rate of 0.15–0.3 mm/tooth, axial depth of cut of 0.3–0.5 mm, and radial depth of cut of 0.2–0.35 mm, the temperature generated can be sufficiently high to cause austenitic transformation. A field emission scanning electron microscope (FESEM) equipped with angle selective backscattered (AsB) detection analysis was used to investigate the microstructure and machined-affected layers of the machined surfaces. The crystallographic orientation/phase change and nano-hardness were analysed through X-ray diffraction (XRD) and a nano-hardness testing machine. The results showed that the cryogenic machining had significantly affected the surface integrity characteristics of the AISI 4340 alloy due to refined microstructure, favourable phase structure, and higher hardness near the surface layer. The results of this study may be useful in providing an insight into a potential technological shift from conventional surface case hardening processes to the present technique.

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Section: Resultsmentioning

confidence: 99%

Cryogenic milling and formation of nanostructured machined surface of AISI 4340

Muhamad

Ghani

Haron

et al. 2020

Nanotechnology Reviews

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“…Such layer is created on the surface by nitrogen diffusing into the substrate of the steel and react with iron and other alloying elements. According to Fe-N phase diagram, for conventional nitriding, nitrided layer are composed of a diffusion zone and a compound layer which consist predominantly of iron nitrides ε-Fe 2-3 N and γ′-Fe 4 N [4][5][6][7]. In general, the wear resistance improvement depends on the properties of the whole nitrided layer (compound layer + diffusion layer) [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of compound layer on the corrosion resistance of low alloy steel in a 3.5% NaCl solution

Wang

2024

Eng. Res. Express

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Samples of AISI 4140 low alloy steel were nitrided at different conditions by using plasma nitriding. The optical microscopy observation and X-ray diffraction analysis showed that a 3~14 m thick compound layer composed of -Fe2–3N and γ′-Fe4N was formed on the surface after nitriding treatments. The corrosion behavior was evaluated by measuring the anodic polarization curves in a 3.5% NaCl solution along with the observation of corroded surfaces and cross-sectional morphologies using optical and scanning electron microscope. The results indicated that the corrosion resistance of low alloy steel was significantly enhanced through the formation of compound layer. The thickness of compound layer was one important factor in determining its corrosion resistance.

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