Oxide layer formed on AISI 5140 steel by plasma nitriding and post-oxidation in a mixture of air and ammonia

Shen, Hongyu; Wang, Liang

doi:10.1016/j.jallcom.2019.07.314

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…Therefore, it is of great value to develop a novel method comprising a nitriding layer with a thin, brittle compound layer and a thick diffusion layer for components subjected to severe impact and heavy load wear. In our previous research [27][28][29][30], post-oxidation (PO) could adjust the characteristics of the nitriding layer, i.e., change the ratio of the compound layer thickness to the diffusion layer thickness. However, no studies have reported on the effect of PO on the nitrided layer toughness.…”

Section: Introductionmentioning

confidence: 99%

Novel Effect of Post-Oxidation on the Comprehensive Performance of Plasma Nitriding Layer

Ni,

Ma,

Wei

et al. 2024

Coatings

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In order to enhance the comprehensive performance of plasma nitrided heavy load components used in corrosive environments, post-oxidation was conducted under different conditions after plasma nitriding 42CrMo4 steel at 500 °C for 5 h. The results show that an oxide film composed of Fe3O4 and Fe2O3 was formed above the compound layer, resulting in a significant increase in corrosion resistance; the self-corrosion potential was greatly increased from −658.72 mV to −429.23 mV. Meanwhile, it needs to be emphasized that the characteristics of the plasma nitriding layer could be effectively adjusted as expected by post-oxidation. The compound layer thickness decreased from 9.41 μm to 3.62 μm by post-oxidation at 400 °C for 2 h, while the thickness of the effective hardening layer increased from 300 μm to 378 μm. Due to the expected change in the characteristics of the plasma nitriding layer, post-oxidation could simultaneously improve the toughness, hardness, and wear resistance of the samples; the brittleness level decreased from Grade 4 to Grade 1; the surface hardness increased from 765 HV0.05 to 825 HV0.05; and the wear rate decreased from 3 × 10−5 g·m−1·N−1 to 1.19 × 10−5 g·m−1·N−1, illustrating that the wear resistance was greatly improved.

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Section: Introductionmentioning

confidence: 99%

Novel Effect of Post-Oxidation on the Comprehensive Performance of Plasma Nitriding Layer

Ni,

Ma,

Wei

et al. 2024

Coatings

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show abstract

“…Applying different heat treatment systems, this alloy can be utilized to manufacture and process mechanical parts that bear different loads while operating at different speeds, such as knuckles, gears, sprockets, shafts, crankshafts, worms, splined shafts, sliders, collars, pins, and connecting rods [2][3][4][5]. Studies show that 40Cr alloy is one of the most commonly used structural materials for processing and manufacturing machinery in diverse industrial and aerospace applications [6]. Considering the joints in the space manipulator as an example, 40Cr alloy is applied in gear shafts and planetary gears in the planetary gear system, and other moving components, connecting rods, and pins.…”

Section: Introductionmentioning

confidence: 99%

“…6 show the microstructures in the transmission electron microscope images of the 5140 alloy steel after tempering at 480 °C, 520 °C, and 560 °C after different proton irradiation evolutions, respectively.…”

mentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of Tempered 5140 Alloy Steel after Proton Irradiation at Different Temperatures

Dai

Niu

2020

Materials

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This article introduces the effect of tempered 5140 alloy steel commonly used in engineering on its structure and mechanical properties under the action of proton irradiation. In the present study, the irradiation energy of 160 keV is applied to experimentally investigate the proton irradiation with different cumulative fluences on the tempered 5140 alloy steel. The effect of the cumulative fluence of the proton irradiation on the microstructure evolution of tempered 5140 alloy steel is studied through transmission electron microscopy. Moreover, the morphology of the tensile fracture is analyzed by scanning electron microscope. The effect of the cumulative fluence of the proton irradiation on the nanomechanical properties of tempered 5140 alloy steel is investigated with a nanomechanical tester. It is found that the surface hardening effect formed by the proton irradiation damage causes the dislocation density in the structure near the tempered 5140 alloy steel surface layer and such effect increases as the proton irradiation cumulative fluence increases. The results obtained show that the yield and tensile strength of the tempered 5140 alloy steel increase slightly as the cumulative fluence of the proton irradiation increases. However, the corresponding elongation decreases. For a stable pressure load of the nanoindentation, the hardness of the nanoindentation of the tempered 5140 alloy steel increases as the proton irradiation fluence increases. However, the corresponding indentation depth decreases. Based on the obtained results, it is concluded that proton irradiation has no significant effect on the macro- and nanomechanical properties of the tempered 5140 alloy steel. This may be attributed to the low energy of the proton irradiation, and the resulting radiation damage only acts on the thin layer of the tempered 5140 alloy steel surface.

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Investigation of surface modifications for combating the molten aluminum corrosion of AISI H13 steel

et al. 2020

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Oxide layer formed on AISI 5140 steel by plasma nitriding and post-oxidation in a mixture of air and ammonia

Cited by 9 publications

References 18 publications

Novel Effect of Post-Oxidation on the Comprehensive Performance of Plasma Nitriding Layer

Novel Effect of Post-Oxidation on the Comprehensive Performance of Plasma Nitriding Layer

Microstructure Evolution and Mechanical Properties of Tempered 5140 Alloy Steel after Proton Irradiation at Different Temperatures

Investigation of surface modifications for combating the molten aluminum corrosion of AISI H13 steel

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