X-Ray Residual Stress in the S-Phase of Stainless Steel Nitrided by Plasma Nitriding Method and Residual Stress Measurement of DLC Film Deposited on the S-Phase

Miki, Yasuhiro; Nishimoto, Akio; Tamiya, Takazumi

doi:10.2472/jsms.65.517

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…Figure 6 shows the residual stress measurement results of the ASPN-treated plate samples. The residual stress values obtained in this study are considered reliable because they are close to the values reported by Y. Miki et al 17) A compressive residual stress was induced by the formation of the S-phase, a supersaturated solid solution of nitrogen in an austenite phase, on the sample surface by ASPN treatment. In addition, the compressive residual stress increased as the treatment time increased because of the increase in the thickness of the S-phase.…”

Section: Experimental Methodssupporting

confidence: 89%

Effect of Active Screen Plasma Nitriding on Fatigue Characteristics of Austenitic Stainless Steel

2019

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In the active screen plasma nitriding (ASPN) method, the material to be processed is insulated. A mesh-like metal screen is placed around the material to be used as the cathode and a furnace wall is used as the anode. In this study, the effect of ASPN treatment on the fatigue characteristics of austenitic stainless steel was investigated. Nitride layers of varying thicknesses were formed by varying the treatment time to energize the treated material without insulation. A direct-current plasma nitriding apparatus was used for active screen plasma nitriding treatment. The nitriding treatment was performed at an N 2 :H 2 concentration ratio of 1:1 for 28.8172.8 ks at 673 K and 100 Pa. The thickness of the nitride layer increased as the treatment time increased. The fatigue strength increased as a result of the ASPN treatment. Furthermore, the fatigue strength increased as the thickness of the nitride layer increased.

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Section: Experimental Methodssupporting

confidence: 89%

Effect of Active Screen Plasma Nitriding on Fatigue Characteristics of Austenitic Stainless Steel

2019

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Dimensional Stability of Low Temperature Surface Hardened Stainless Steel Components*

Bauer

Schreiner²

2021

HTM Journal of Heat Treatment and Materials

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Stainless steels are commonly used for high precision components, which often are exposed to corrosive media. However, their inferior tribological behaviour restrict the use of these materials in many technical applications. Thermochemical surface hardening is one way to overcome these weaknesses. Solution nitriding in the austenitic range above 1000 °C is mainly used for hardening martensitic and ferritic stainless grades. In austenitic and duplex stainless grades, however, the hardening effect is limited. Additionally, the high process temperatures combined with a necessary rapid cooling may lead to non-desired dimensional changes. Low temperature surface hardening processing below 500 °C here offers interesting alternatives for increasing the wear properties, while maintaining the corrosion resistance. This paper demonstrates the influence of high and low process temperatures of thermochemical surface hardening treatments on the tight dimensional tolerances of a rotationally symmetrical precision component made from cold worked AISI 304. Based on these results, current and new industrial applications, which benefit from low temperature surface hardening, will be discussed.

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Effect of Nitrogen Concentration Profile on the Wear Rate of Expanded Austenite Phase

Handa

Abraha

2021

J. Japan Inst. Metals and Materials

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The wear rate of the expanded austenite phase formed by low-temperature plasma nitriding treatment determines the lifetime of the treated stainless steel components. In this research, austenitic stainless steel (AISI304) samples were plasma nitrided between 1 h and 24 h at a temperature of 400℃, a pressure of 1.0 Pa (25％ N 2 and 75％ H 2 ) gas ambiance. The expanded austenite phase was characterized in thin layers with about the same nitrogen concentration. Characterization of the samples was performed by wavelength dispersive X-ray analysis (WDS) using Electron Probe Micro Analyzer (EPMA), X-ray diffraction (XRD), laser microscopy, and micro-Vickers hardness. The results of our experiments confirm that the wear rate of the expanded austenite phase varies with the depth from the surface. Thin layers of expanded austenitic phase with the same nitrogen concentration but formed under different treatment times showed the same wear rate. As the nitrogen concentration increased, the lattice parameters and compressive residual stresses calculated from the XRD pattern showed a logarithmic increase. The wear rate, on the other hand, decreased exponentially and reached 35 × 10 −6 mm 3 /min at 25 at％. Finally, from the data obtained for the wear rate against the nitrogen concentration, an exponential fitting curve was established to determine the wear rate at any specific depth of the austenitic expanded phase.

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X-Ray Residual Stress in the S-Phase of Stainless Steel Nitrided by Plasma Nitriding Method and Residual Stress Measurement of DLC Film Deposited on the S-Phase

Cited by 3 publications

References 21 publications

Effect of Active Screen Plasma Nitriding on Fatigue Characteristics of Austenitic Stainless Steel

Effect of Active Screen Plasma Nitriding on Fatigue Characteristics of Austenitic Stainless Steel

Dimensional Stability of Low Temperature Surface Hardened Stainless Steel Components*

Effect of Nitrogen Concentration Profile on the Wear Rate of Expanded Austenite Phase

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