Microstructure and corrosion resistance of the layers formed on the surface of precipitation hardenable plastic mold steel by plasma-nitriding

Wen, Dong

doi:10.1016/j.apsusc.2009.08.062

Cited by 74 publications

(23 citation statements)

References 20 publications

(19 reference statements)

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“…이에 따라 난삭 재료들의 가공기술에 대한 연구가 활발히 진행되고 있다. 그 중 NAK80 금형강은 우수한 용접성과 높은 표면경도, 안정성 등의 장점으로 정밀금 형에 적합하여 사출성형, 정밀 플라스틱 금형과 프레스 금형 등 금형 산업에서 많이 사용되는 소재이다 (1) . 이런 난삭 소재의 가공은 주로 연삭가공에 의해 이루어지는데 금형의 복잡한 형 상 때문에 연삭숫돌의 제작이 어렵고, 일반적인 연삭가공으로 는 균일한 표면을 얻기가 매우 힘들다.…”

Section: 서 론unclassified

Surface Condition Monitoring in Magnetic Abrasive Polishing of NAK80 Using AE Sensor and Neural Network

Kim¹,

Shin²,

Kim³

et al. 2012

Journal of manufacturing engineering & technology

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The magnetic abrasive polishing (MAP), for online monitoring with AE sensor attachment, was performed in this study.To predict the surface roughness after the magnetic abrasive polishing of NAK80, the signal data acquired from the AE sensor were analyzed. A dimensionless coefficient, which consisted of average of AErms and standard deviation of AE signal, was defined as a characteristic of the MAP and a prediction model was obtained using least square method. A neural network, which had multiple input parameters from AE signals and polishing conditions, was applied for predicting the surface roughness. As a result of this study, it was seen that there was very close correlation between the AE signal and the surface roughness in the MAP. And then on-line prediction of the surface roughness after the MAP of the NAK80 was possible by the developed prediction model.

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Section: 서 론unclassified

Surface Condition Monitoring in Magnetic Abrasive Polishing of NAK80 Using AE Sensor and Neural Network

Kim¹,

Shin²,

Kim³

et al. 2012

Journal of manufacturing engineering & technology

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“…Major deficiencies of the tool steels which get them out of service, are due to wear, local corrosion and even thermo-mechanical fatigue [1] and as for their application, they are always exposed to great thermal stresses. However, tribological limitations and problem of these steels can be tackled using a proper and effective surface treatment technique [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Study on Formation and Growth Mechanism of Nitride Layers During Plasma Nitriding Process of Plastic Injection Mold Steel

Nayebpashaee

Soltanieh

Kheirandish

2015

Materials and Manufacturing Processes

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Ion nitriding modifies composition of surface layer in steel used in plastic mold application and this consequently improves their lifecycle. In this study, pulsed plasma nitriding technique was used to produce a protecting hard layer on AISI P20 steel at three process temperatures of 450°C, 500°C and 550°C for durations of 2.5, 5, 7.5 and 10 hours at a constant gas mixture of 75% N 2 -25% H 2 . Surface morphology was studied by optical and scanning electron microscope (SEM) and the phases formed on the surface layer were determined by X-Ray diffraction (XRD). Elemental depth profile was measured by techniques including EDS, WDS and GDS and for identifying hardness profile, micro-hardness variations from surface to core of samples were recorded. Results showed that, thickness of compound layer of plastic mould steel AISI P20 was negligible.Moreover in ion nitriding of AISI P20, nitride were formed and grown in some preferred directions and upward diffusion of carbon and downward diffusion of nitrogen occurred during ion nitriding of AISI P20. XRD results showed that, ε-nitride is the dominant phase after plasma nitriding in all strategies. Furthermore, ion nitriding improved Downloaded by [New York University] at 02:06 14 July 2015 2hardness of AISI P20 up to 3 times and as time and temperature increased, hardness and hardness depth of diffusion zone increased considerably.

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“…The corrosion resistance of nitrided steels depends on the phase composition and compound layer integrity [7,8]. A positive influence of ε-phase (Fe 2−3 N) to corrosion resistance increase had been found; this increased corrosion resistance can be further increased by the post-oxidizing process (surface oxidation) of the nitride layer [9][10][11]. Corrosion resistance of plasma nitrided 42CrMo4 steel (AISI 4137/4140), used in weapon industry for breech mechanism manufacturing, was compared with another surface technologies used for surface treatment of breech parts namely: alkali blackening used for optical and aesthetic reasons, manganese phosphate used for running-in improvement and nitrocarburizing (Tenifer ) for wear and corrosion resistance increasing.…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistance of surface treated 42CrMo4 steel

Kusmič¹,

Hruby²,

Bachárová³

2016

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This article deals with corrosion resistance comparison of plasma nitrided 42CrMo4 steel to another surface technologies used for breech mechanism manufacturing in the armament production. Increasing of demands on materials used for armament production and in other industrial applications leads to the innovation of technologies in the field of surface treatment, especially wear resistance, surface hardness, running-in properties and corrosion resistance, optical demands and others. For the evaluation of experimental corrosion resistance were plasma nitrided samples of 42CrMo4 steel compared with alkali blackening, manganese phosphate and Arcor technologies. The conditions of plasma nitriding process were set to provide exactly defined nitride layers with defined parameters. In this case, the above-mentioned surface technologies were applied to individual samples of 42CrMo4 steel, which were subsequently metallographically evaluated and the hardness and microhardness were measured. The corrosion resistance comparison was realized by the NSS corrosion tests in the condensation chamber and visually evaluated. The results and comparison of corrosion resistance of plasma nitrided steel samples with above-mentioned surface treatment technologies showed significant differences in corrosion rate propagation. Thank to different plasma nitriding conditions, there are evident differences in corrosion resistance between the plasma nitrided steel samples as well. The corrosion resistance evaluation is supplemented by the surface layer characteristics. K e y w o r d s : plasma nitriding, breech mechanism, corrosion resistance

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Microstructure and corrosion resistance of the layers formed on the surface of precipitation hardenable plastic mold steel by plasma-nitriding

Cited by 74 publications

References 20 publications

Surface Condition Monitoring in Magnetic Abrasive Polishing of NAK80 Using AE Sensor and Neural Network

Surface Condition Monitoring in Magnetic Abrasive Polishing of NAK80 Using AE Sensor and Neural Network

A Study on Formation and Growth Mechanism of Nitride Layers During Plasma Nitriding Process of Plastic Injection Mold Steel

Corrosion resistance of surface treated 42CrMo4 steel

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