A novel rapid D.C. salt bath nitrocarburizing technology

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

doi:10.1016/j.vacuum.2014.07.016

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…After salt bath nitriding, a compound layer is formed, which can significantly improve the performance of metal [7][8][9]. However, for obtaining the effective thickness of nitrided layer, the nitriding temperature or holding time must be increased [10][11][12], which would bring out porosity in the nitrided layer, thus may results in side effect on the surface hardness and wear resistance. It has been reported that preoxidation can enhance the nitriding efficiency, since a thin oxide layer is formed during preoxidation process, which can be decomposed during the followed nitriding process [13,14].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Salt Bath Preoxidation and Air Preoxidation for Salt Bath Nitriding

Mei

Dai

et al. 2019

Acta Metall Slovaca

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<p class="AMSmaintext1">Salt bath preoxidation was primarily conducted prior to salt bath nitriding, and the effect on salt bath nitriding was compared with that of conventional air preoxidation. Characterization of the modified surface layer was made by means of optical microscopy, scanning electron microscope (SEM), micro-hardness tester and x-ray diffraction (XRD). The results showed that the salt bath preoxidation could significantly enhance the nitriding efficiency. The thickness of compound layer was increased from 13.3μm to 20.8μm by salt bath preoxidation, more than 60% higher than that by conventional air preoxidation under the same salt bath nitriding parameters of 560℃ and 120min. Meanwhile, higher cross-section hardness and thicker effective hardening layer were obtained by salt bath preoxidation, and the enhancement mechanism of salt bath preoxidation was discussed.</p>

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Section: Introductionmentioning

confidence: 99%

Comparison of Salt Bath Preoxidation and Air Preoxidation for Salt Bath Nitriding

Mei

Dai

et al. 2019

Acta Metall Slovaca

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“…The most desirable phase to comprise the microstructure of the compound layer is the single ɛ-Fe 2-3 N phase. However, it has been found that the compound layer formed by plasma nitrocarburizing usually consists of a heterogeneous mixture of ɛ-Fe 2-3 N and γ'-Fe 4 N phases 16,[17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

Morphology of the DIN 100Cr6 Case Hardened Steel after Plasma Nitrocarburizing Process

Fontes¹,

Scheid

Machado

et al. 2019

Mat. Res.

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Nitrocarburizing is considered one of the most important thermochemical treatments for surface modification of metallic materials and involves the simultaneous diffusion of nitrogen and carbon onto the surface. Understanding and controlling the formation of the nitrocarburized layer have considerable industrial interest due to the improvements regarding wear, fatigue, and corrosion resistances. DIN 100Cr6 steel samples were treated by plasma nitrocarburizing for two hours, with two treatment temperatures (550 and 600°C) and four methane concentrations in the gas mixture composition (0, 1.0, 1.5, and 2.0%). SEM and XRD analyses, and wear resistance tests were used to characterize the samples. Results showed that the treatment temperature and atmosphere composition had considerable influence on the compound layer morphology. For nitrided samples the compound layer consists of γ'-Fe 4 N phase, and the presence of carbon in the gas mixture helps stabilize the ɛ-Fe 2-3 N phase. Higher CH 4 concentration in the treatment atmosphere improve the sample superficial wear resistance.

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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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A novel rapid D.C. salt bath nitrocarburizing technology

Cited by 13 publications

References 11 publications

Comparison of Salt Bath Preoxidation and Air Preoxidation for Salt Bath Nitriding

Comparison of Salt Bath Preoxidation and Air Preoxidation for Salt Bath Nitriding

Morphology of the DIN 100Cr6 Case Hardened Steel after Plasma Nitrocarburizing Process

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

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