Effects of Nitriding and Nitro-carburizing on the Fatigue Properties of Ductile Cast Iron

Nobuki, Tohru; Hatate, Minoru; Kawasaki, Yoshihisa; Ikuta, Akihiko; Hamasaka, Naoji

doi:10.1007/s40962-016-0088-5

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…The nitrided sample presents intense peaks associated to the γ'-Fe 4 N phase and only very minor peaks of the ɛ-Fe 2-3 N phase, as reported by Nobuki et al 30 . The compound layers formed under higher amount of CH 4 consists mainly of the ɛ-Fe 2-3 N phase with trace amounts of the γ'-Fe 4 N phase.…”

Section: Resultssupporting

confidence: 77%

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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Section: Resultssupporting

confidence: 77%

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

Fontes¹,

Scheid

Machado

et al. 2019

Mat. Res.

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“…Simultaneously, compression stress occurs in the nitrocarburized layer [8]. Additionally, in [10,11], the high fatigue strength of carburized and nitrocarburized parts is explained by the high yield point of the surface layer.…”

Section: Introductionmentioning

confidence: 99%

Impact of Nitrocarburizing on Hardening of Reciprocating Compressor’s Valves

et al. 2022

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One of the urgent problems in reciprocating machinery is ensuring the functional properties of direct-flow valves. Coatings of these parts should increase energy efficiency, reduce compressed gas temperature, and increase compressor performance. In this article, the effect of nitrocarburizing in pastes on increasing the performance and resource of such valves was studied. The primary research methods were metallographic and electron-metallographic research of the surface layer structure of steel 60Si2Cr. Comparison with similar characteristics obtained for stainless steel 09Cr15Ni8Al was also performed. As a result, it was determined that nitrocarburizing of carbon spring steel 60Si2Cr leads to a greater depth of the diffusion layer than nitrocarburizing of alloyed chromium-nickel steel 09Cr15Ni8Al. Simultaneously, the diffusion layers of both types of steel are almost the same. Simultaneously, the increase in the endurance limit of 60Si2Cr steel during nitrocarburizing is about 1.3 times compared to untreated material. Finally, the predictive maintenance showed that the evaluated lifetime of nitrocarburized valves increases by 5.7 times compared with untreated valves.

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“…In previous contributions, several authors have analysed the effect of nitrocarburizing on the fatigue limit of the plain material [26][27][28][29][30][31], while only few contributions [10,24] have been devoted to investigating the effect of nitrocarburizing on the medium-high cycle fatigue regime, considering both plain and notched specimens. Moreover, the effects of the combination of salt bath nitrocarburization and post-oxidation, i.e., QPQ treatment, have been mainly analysed from the point of view of microstructure, hardness, wear and corrosion resistance [14][15][16][17][18]32], while the effects of QPQ treatment on the fatigue behaviour have been investigated in detail only for some steel categories, such as carbon steels [33][34][35], alloyed steels [36,37], tool steel [38]; and also for ductile cast iron [39].…”

Section: Introductionmentioning

confidence: 99%

Effect of Salt Bath Nitrocarburizing and Post-Oxidation on Static and Fatigue Behaviours of a Construction Steel

Campagnolo

Dabalà

Meneghetti

2019

Metals

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Several surface modification technologies are typically applied to improve the mechanical properties of the material surface of structural components subjected to severe conditions of load, wear and chemical erosion of the surface. The nitrocarburizing and post-oxidation heat treatment, also known as quench-polish-quench (QPQ), improves the fatigue, wear and corrosion resistance properties of the material, since it increases the surface hardness and generates surface compressive residual stresses. In the present contribution, the effects of the salt bath nitrocarburizing and post-oxidation heat treatment on the static and fatigue behaviours of 39NiCrMo3 construction steel have been investigated by experimentally testing plain as well as notched specimens. For comparison purposes, 39NiCrMo3 construction steel, both untreated and treated, and X5CrNiCuNb 16-4 stainless steel have been tested. First, the microstructure of the untreated and treated steel has been identified by metallographic analysis; micro-hardness measurements have been collected and residual stresses profiles have been obtained by using the X-ray diffraction technique. Then, experimental static and fatigue tests have been performed. Finally, the fracture surfaces have been analysed to locate fatigue crack nucleation sites.

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Effects of Nitriding and Nitro-carburizing on the Fatigue Properties of Ductile Cast Iron

Cited by 6 publications

References 9 publications

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

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

Impact of Nitrocarburizing on Hardening of Reciprocating Compressor’s Valves

Effect of Salt Bath Nitrocarburizing and Post-Oxidation on Static and Fatigue Behaviours of a Construction Steel

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