Advanced QPC complex salt bath heat treatment

Yeung, C. F.; Lau, K. H.; Li, H.Y.; Luo, De Fu

doi:10.1016/s0924-0136(96)02535-6

Cited by 39 publications

(13 citation statements)

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“…The liquid nitrocarburizing in salt bath has been widely employed in industry since the 1940s; however, this method had a major issue related to toxicity of the cyanide-cyanate salt, which was solved in 1970 [11] by adopting a nontoxic cyanate-bearing bath. Later on, in the 1980s, an advanced salt bath heat treatment, given by the combination of nitrocarburizing and post-oxidation, known also as quench-polish-quench (QPQ) treatment, has been proposed and, then, widely employed in industrial applications, since it was demonstrated that the additional process of post-oxidation after nitrocarburizing further enhances the mechanical properties of the treated materials [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 99%

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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“…However, the low hardness and, in particular, the poor wear resistance limits its wide applications, which highlights the significance to enhance the wear resistance. Quench polish quench (QPQ) is an environmentally friendly heat treatment technology for metal surfaces which contributes to improving mechanical properties and corrosion resistance at low cost and with low part distortion [5,6]. As a comprehensive method of metal surface strengthening, its essence is the combination of nitriding and oxidation processes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Quench Polish Quench Nitriding Temperature on the Microstructure and Wear Resistance of SAF2906 Duplex Stainless Steel

Xiang

Liu

et al. 2019

Metals

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The effect of quench polish quench (QPQ) nitriding temperature on the microstructure and wear resistance of SAF2906 duplex stainless steel was investigated. Results showed the surface of the nitrided samples was composed of an oxidized layer, a loose compound layer, a compact compound layer, and a diffusion layer. The oxidized layer was composed of Fe3O4. The main phases of the loose compound layer were CrN, αN, Fe2–3N, and Fe3O4. The compact compound layer was composed of CrN, αN, and Fe2–3N. In the diffusion layer, CrN and expanded austenite (S) were the main phases. The nitrided layer thickness increased from 20 to 41 μm with an increasing temperature of 570 to 610 °C. When the nitriding temperature was above 590 °C, the precipitates in the diffusion layer became coarsened, and their morphologies gradually changed from spherical particulate to rod-like and flocculent-like. Tribotests showed the cumulative mass loss of QPQ-treated samples was much lower than that of the substrate. The cumulative mass loss of the samples nitrided at 610 °C was higher than that at 570 °C during the first 29 h. When the test time was over 29 h, the former was lower than the latter.

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“…Salt bath nitriding is developed as an industrial process, especially for surface modification of iron-based steels; this process technology has solved environmental problems and can be applied DOI 10.12776 to AISI 1045 steel and high alloy steels with high reaction efficiency [13][14]. Salt bath nitriding is done to obtain high surface hardness, to increase wear resistance, to improve fatigue life, and to improve corrosion resistance, high dimensional stability [15][16]. Chosen for this paper work, on the basis of their application and commercial availability, there is insufficient knowledge about the effects of nitriding factor on microstructure and properties when complex salt bath nitriding is done on AISI 1045 steel at low temperature.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Salt Bath Nitriding Variables on Hardness Layer of Aisi 1045 Steel

Ghelloudj¹,

Djebaili²,

Hannachi³

et al. 2016

Acta Metall Slovaca

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The aim of this paper is to study and analyze the effects of a surface controlled salt bath nitriding on the microhardness of AISI 1045 steel. 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 (520ºC). The nitriding process repeated of other specimens at the same times, but the temperature was (580ºC).The microstructure of the surface layers was investigated by scanning electron microscopy (SEM) and optical microscopy. Hardness profiles were measured with lowload hardness testing to determine the growth of the case depth after nitriding. Microhardness testing was carried out on samples to investigate the hardness profile at the transition from the compound to the diffusion layer. The microhardness of the surface of the nitrided sample at 520ºC and 580ºC was observed in the range of 318-430 HV0.3 and 329-421 HV0.3, respectively. Experimental results showed that the nitrides ε-Fe2-3(N, C) and γ'-Fe4(N,C) present in the compound layer increase the microhardness , It also showed that the Increasing the salt bath nitriding parameters (treatment time and temperature) increases the surface hardness and hardness profile.

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Advanced QPC complex salt bath heat treatment

Cited by 39 publications

References 0 publications

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

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

Effect of Quench Polish Quench Nitriding Temperature on the Microstructure and Wear Resistance of SAF2906 Duplex Stainless Steel

The Influence of Salt Bath Nitriding Variables on Hardness Layer of Aisi 1045 Steel

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