Gotowe bibliografie tematyczne / Nitriding

Gotowa bibliografia na temat „Nitriding”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 6 lipca 2024

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Artykuły w czasopismach na temat "Nitriding"

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A-Hussein Al-Taee, Abbas. "Fatigue Behaviour of Nitrided En41A Nitralloy Steel". FES Journal of Engineering Sciences 2, nr 1 (6.11.2006): 18. http://dx.doi.org/10.52981/fjes.v2i1.90.

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It has been recognized that the fatigue properties of metals are greatly affected by the surface condition. In steel parts a marked improvement in fatigue performance can result from the formation of hard layer on the surface. The processes commonly used for surface hardening are nitridig and carburizing. The reason for such improvement is attributed to the formation of compressive residual stresses in the hardened layer. Nitriding processes produce higher hardness, hence induces higher compressive residual stresses., which effectively increase fatigue performance. In this work, a mixture of (NH3 –H2 )) gas was used for nitriding fatigue specimens of En41 A steel. The effect of nitriding condition such as, temperature, ammonia content., nitriding time, hardness, microstructure and the depth of nitrided layer was investigated. The results from fatigue tests were discussed and related with the hardness and the nature of microstructure of nitrided layer. It was found that higher hardness without the formation of Iron-nitride layer ( white layer) gives better fatigue properties.
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Sklizkov, Ivan Dmitrievich, Ruslan Karimovich Vafin, Alexandr Vladislavovich Asylbaev i Daniil Valerievich Mamontov. "Investigation of influence of ion nitriding in the glow discharge with magnetic field on microstructure and microhardness of steel HSS M2 with preliminary plastic deformation". Materials. Technologies. Design 5, nr 3 (13) (6.12.2023): 143–51. http://dx.doi.org/10.54708/26587572_2023_5313143.

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This work was devoted to the study of the influence of magnetic field on microhardness of HSS M2steel during ion nitriding in the glow discharge. The samples were preliminarily subjected to intenseplastic torsion deformation (IPTD). Standard methods of optical metallography and microhardnessmeasurements were used in the experiments. It was found that IPTD allows creating ultrafine-grained(UFG) structure in the material, and magnetic field allows intensifying the process of ion nitriding byincreasing the number of ionization acts, which leads to an increase in the thickness of the diffusionlayer and microhardness compared to ion nitriding without preliminary IPTD and without magneticfield. The results obtained indicate the importance of using a magnetic field during ion nitridingin the glow discharge. The described effects are of potential interest for improving the mechanicalproperties of high-speed steels.
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Kartikasari, Ratna, Adi Subardi, Rivan Muhfidin, Ihwanul Aziz, Marwan Effendy, Triyono Triyono i Kuncoro Diharjo. "Development of Fe-13.8Cr-8.9Mn alloy for steel biomaterials". Eastern-European Journal of Enterprise Technologies 6, nr 12 (126) (27.12.2023): 6–15. http://dx.doi.org/10.15587/1729-4061.2023.293009.

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Traumatic, osteoarthritic, tumoral, and congenital bone issues impact human lives and health. The next generation of bone implants is made from biodegradable materials, including Fe-based materials with superior mechanical properties and high biocompatibility. However, efforts to inhibit the risk of inflammation and bacterial infection due to the biological response and corrosion properties of metals are a significant challenge. This study aims to develop biomaterials based on Fe-Cr-Mn alloys to obtain superior physical and mechanical properties through plasma nitriding. Each sample was plasma-nitridated in a vacuum chamber at various temperatures of 250–450 °C for 3 hours at a pressure of 1.8 kPa. Several main tests were performed to investigate the effects of plasma nitriding, such as the chemical compositions of raw material, surface nitrogen contents, phase changes, thickness, hardness, and corrosion. Those parameters were then used to evaluate plasma nitriding's effectiveness, including observing the change in phenomena at each temperature treatment. The results indicated that forming the S phase on the surface of Fe-13.8Cr-8.9Mn alloy is a saturated solution of nitrogen in ɣ-Fe, where the nitrogen content on the surface increases with increasing nitriding temperature. The layer's surface hardness is uniform across its whole thickness, which reduces as the grade of raw material passes through the nitride layer. The highest hardness at a nitriding temperature of 450 °C reached 625.3 VHN. The findings showed that the corrosion rate decreased significantly, reaching the lowest value, 0.0018 mm/year, at a plasma nitriding temperature of 450 °C. Plasma nitriding could enhance the physical and mechanical properties of Fe-Cr-Mn alloy
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Badisch, Ewald, Andreas Trausmuth, Manel Rodríguez Ripoll, Alexander Diem, Wolfgang Kunze, Johann Glück, Klaus Lingenhöle i Peter Orth. "Influence of Nitrocarburizing Process Parameters on the Development of Surface Roughness and Layer Formation". Key Engineering Materials 674 (styczeń 2016): 325–30. http://dx.doi.org/10.4028/www.scientific.net/kem.674.325.

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Nitriding of tools and engineering components is a well-established surface modification procedure in many industries to ensure operational efficiency. The focus of this work is laid on understanding the influence of nitriding processing technology on the resulting surface properties which strongly dominate its tribological performance. Therefore, nitriding layers based on salt bath and plasma procedure were realised using 31CrMoV9 substrate. The surface roughness before nitriding was set to a Ra value of ~0.16 μm which corresponds to at technically fine grinded surface. 3D measurements as well as SEM micrographs of the nitrided surfaces were compared to the original surface prior to the nitriding procedure. Additionally, cross-section microscopy and hardness depth profiles were done to describe nitriding layer structure and nitriding hardness depth (NHD). Results show a correlation of nitriding processing parameters with the resulting compound layer formation and nitriding hardening depth (NHD). An increase of surface roughness during nitriding can be correlated with the growth of ɛ-nitrides on top of the surface.
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Xiong, Xin Hong, Jia Lin Chen, Dun Miao Quan i Qiao Xin Zhang. "Research on the Nitriding Effect of Ta-10W with Change of Process Parameters". Advanced Materials Research 941-944 (czerwiec 2014): 1406–9. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.1406.

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Plasma nitriding is a thermochemical treatment method to make the metal surface reinforced. It can be used to significantly improve the surface hardness, abrasion resistance, fatigue strength, corrosion and erosion resistance. This paper presents a study of the influence of nitriding temperature and holding time on the nitriding effect while different nitriding process parameters are adopted on Ta-10W board samples by plasma nitriding technology. The result shows that nitriding temperature is the key parameter to the final effect of nitriding. Samples nitrided at 950oC for 10h get thicker nitride layer and more nitrogen in nitride layer.
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Liu, Yong, Xing Sheng Lao, Chun Hui Dai i Shi Wei Yao. "Study on Surface Structure and Properties of Titanium Alloy Modified by Ion Nitriding". Materials Science Forum 1005 (sierpień 2020): 24–28. http://dx.doi.org/10.4028/www.scientific.net/msf.1005.24.

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TC4 titanium alloy was treated by ion nitriding. The structure of nitriding layer was analyzed by scanning electron microscopy. The depth and microhardness of nitriding layer were measured. The frictional properties of titanium alloy before and after nitriding were compared by friction test. The results show that the ion nitriding technology can form a stable nitriding layer with a depth of up to 20μm and a surface hardness of 560 HV0.2. At the same time, after nitriding, the wear resistance of the titanium alloy surface is improved. And the coefficient of friction between the friction pair is reduced.
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ISHIKAWA, Nobuyuki, Tetsuo SHIRAGA, Kaoru SATO, Moriyuki ISHIGURO, Hitoshi KABASAWA i Yoshihiro KUWAHARA. "Effects of Nitriding Temperature on Gas Nitriding Property of Steels for Nitriding". Tetsu-to-Hagane 82, nr 2 (1996): 164–69. http://dx.doi.org/10.2355/tetsutohagane1955.82.2_164.

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Li, Wan Jun, i Xiao Xia Li. "Research on Gas Nitriding Technology Catalyzed by Rare Earth for 40CrNiMoA Alloy Steel". Materials Science Forum 953 (maj 2019): 21–25. http://dx.doi.org/10.4028/www.scientific.net/msf.953.21.

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A kind of gas nitriding method catalyzed by rare earth for 40CrNiMoA alloy steel was researched in this article. Effect of temperature on surface hardness of gas nitriding method catalyzed by rare earth, change law of layer depth with time at 500 °C were carried out and compared with normal gas nitriding. Based on these researches, gas nitriding method catalyzed by rare earth was optimized. The results show that gas nitriding catalyzed by rare earth can not only increase the nitriding speed, but also enhance the surface hardness of the nitriding layer. Using three - stage gas nitriding method catalyzed by rare earth and after 40 hours, the samples can meet the need of nitrided layer depth no less than 0.5mm, surface vickers hardness no less than 600.
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Berladir, Khrystyna, Tetiana Hovorun, Vitalii Ivanov, Djordje Vukelic i Ivan Pavlenko. "Diffusion Nitride Coatings for Heat-Resistant Steels". Materials 16, nr 21 (26.10.2023): 6877. http://dx.doi.org/10.3390/ma16216877.

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The effect of ion nitriding and nitriding in a melamine-based powder mixture on the structure and properties of AISI A290C1M steel was studied in the paper. Using ion nitriding made it possible to shorten the technological cycle’s duration by 5–6 times compared to two-stage nitriding, optimize the diffusion layer’s composition, provide a technologically simple process automation scheme, and improve the quality of nitride coatings. After the proposed mode of ion nitriding, a saturated layer depth of 0.25–0.32 mm, hardness up to 1000 HV, and an increase in wear resistance by 2.17 times were obtained. Using 95% melamine + 5% sodium fluoride during nitriding in a powder mixture significantly simplified the technological process. It did not require additional expensive equipment, which in turn significantly simplified the nitriding process with energy savings. The proposed technology and the composition of the mixture contributed to a significant acceleration of the nitriding process of AISI A290C1M steel, compared to traditional gas nitriding, and to obtain a hardness of the nitride layer of 970 HV and an increase in wear resistance by 2.6 times. A nitriding speed is explained by a significantly higher amount of atomic nitrogen when using melamine instead of ammonia and by the almost simultaneous disintegration of nanodispersed particles when the nitriding temperature was reached. After nitriding in a powder mixture, steel was subject to the slightest wear.
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Senatorski, Jan, Paweł Mączyński i Jan Tacikowski. "A comparison of some properties of the computer controlled nitriding process versus carburizing". Inżynieria Powierzchni 26, nr 1 (8.06.2021): 23–33. http://dx.doi.org/10.5604/01.3001.0014.8775.

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A comparison is presented of the nitriding and carburizing processes. Traditional gas nitriding, despite its several advantages over carburizing, has still not achieved its due popularity. The key factor is inadequate process control. An industrial-scale computerized system, employing the nitriding potential as the fundamental controlling parameter, can produce repeatable, superior nitriding results, limiting layer brittleness and enhancing usable properties. Results obtained showed that nitriding layers match carburized layers in fatigue, while exceeding them in both impact strength and wear resistance. The superiority of the computer-controlled process over traditional nitriding is illustrated by results of wear testing. The advent of controlled nitriding makes this process a viable alternative to carburizing.
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Rozprawy doktorskie na temat "Nitriding"

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Fitz, T. "Ion nitriding of aluminium". Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29382.

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Fitz, T. "Ion nitriding of aluminium". Forschungszentrum Rossendorf, 2002. https://hzdr.qucosa.de/id/qucosa%3A21765.

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Yang, Mei. "Nitriding - fundamentals, modeling and process optimization". Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/127.

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Gas nitriding is an important thermochemical surface treatment that is used to improve the wear and corrosion resistance as well as the fatigue endurance of steel parts. Accurate process control is the effective way to ensure the properties reliability of nitriding process. To realize the accurate process control, the nitriding process parameters need to be modeled and controlled to meet the specifications. There has been ongoing effort on the simulation of the gas nitriding process since 1990s. However, most of the work has been done to simulate the gas nitriding process of pure iron due to the limited thermodynamics and kinetics information available on the gas nitriding process of steels. The objective of this project is to develop an accurate and user friendly software model to simulate the gas nitriding process of steels based on the fundamental understanding of thermodynamics and kinetics. In this work, the customized Lehrer diagram which describes the phase stabilities in specified steel as a function of nitriding potential and temperature has been successfully constructed by computational thermodynamics for the first time. Based on the Lehrer diagrams for steels, the compound layer growth model is proposed to simulate the gas nitriding process of steels. By using this model, the properties of the nitrided steels based on the phase constitution, surface nitrogen concentration, nitrogen concentration profile, case depth, as well as growth kinetics can be simulated as a function of the process parameters (temperature, time, and the nitriding atmosphere). The results of the model are in excellent agreement with experimental results.
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Liu, Wendi. "The effects of contaminants on the gas nitriding of Nitralloy-135". Worcester, Mass. : Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-112408-113232/.

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Crust, Glen Alexander. "The nitriding of high speed steel cutting tools". Thesis, University of Plymouth, 1989. http://hdl.handle.net/10026.1/2379.

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There is an interest in industry in cost reduction. Tool wear constitutes an important element in the cost of many metal working processes, not only because of the cost of the tool, but also because of the cost of machine downtime. Saltbath nitriding of high speed steel tools adds only about 1% to the cost of a finished tool, but has been found to confer benefits considerably in excess of this over a range of cutting conditions . A series of cutting tests is described, during which cutting forces and tool temperatures were recorded simultaneously using microcomputer based instrumentation developed at the Polytechnic as part of this study. The shear mechanism for tools with a nose radius is investigated, and methods for evaluating the primary shear plane area are proposed and discussed. The variation in primary shear plane area with chip flow angle is evaluated. The method for predicting chip flow angle from tool geometry is presented, and results from this analysis compared with experimental data . A method for predicting primary shear angle from tool geometry, force measurements and workpiece material properties is developed. A number of methods for measuring tool temperature are described . Temperature distributions obtained from finite element heat transfer analysis are presented, and a mechanism for the catastrophic failure of the toolnose is proposed. A range of cutting conditions is described, over which the performance of high speed steel cutting tools is enhaced by saltbath nitriding.
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Bennett, Robert. "The plasma nitriding of tool and bearing steels". Thesis, Aston University, 1987. http://publications.aston.ac.uk/11876/.

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There is some evidence to suggest that nitriding of alloy steels, in particular high speed tool steels, under carefully controlled conditions might sharply increase rolling contact fatigue resistance. However, the subsurface shear stresses developed in aerospace bearing applications tend to occur at depths greater than the usual case depths currently produced by nitriding. Additionally, case development must be limited with certain materials due to case spalling and may not always be sufficient to achieve the current theoretical depths necessary to ensure that peak stresses occur within the case. It was the aim of' this work to establish suitable to overcome this problem by plasma nitriding. To assist this development a study has been made of prior hardening treatment, case development, residual stress and case cracking tendency. M2 in the underhardened, undertempered and fully hardened and tempered conditions all responded similarly to plasma nitriding - maximum surface hardening being achieved by plasma nitriding at 450°C. Case development varied linearly with increasing treatment temperature and also with the square root of the treatment time. Maximum surface hardness of M5O and Tl steels was achieved by plasma nitriding in 15% nitrogen/85% hydrogen and varied logarithmically with atmosphere nitrogen content. The case-cracking contact stress varied linearly with nitriding temperature for M2. Tl and M5O supported higher stresses after nitriding in low nitrogen plasma atmospheres. Unidirectional bending fatigue of M2 has been improved up to three times the strength of the fully hardened and tempered condition by plasma nitriding for 16hrs at 400°C. Fatigue strengths of Tl and M5O have been improved by up to 30% by plasma nitriding for 16hrs at 450°C in a 75% hydrogen/25% nitrogen atmosphere.
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Tsujimura, Hiroyuki. "Electrochemical nitriding in molten LiCL-KCL-Li3N systems". Kyoto University, 2004. http://hdl.handle.net/2433/147418.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(エネルギー科学)
甲第10972号
エネ博第83号
新制||エネ||24(附属図書館)
UT51-2004-G819
京都大学大学院エネルギー科学研究科エネルギー基礎科学専攻
(主査)教授 伊藤 靖彦, 教授 八尾 健, 教授 吉田 起國
学位規則第4条第1項該当
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Wei, Yingying. "Simulation, optimization and development of thermo-chemical diffusion processes". Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/145.

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Thermo-chemical diffusion processes play an important part in modern manufacturing technologies. They exist in many varieties depending on the type of diffusing elements used and the respective process objectives and procedures. To improve wear and/or corrosion performance of precisely machined steel components, gas nitriding is selected as the most preferred thermo-chemical surface treatment. Conventional gas nitriding of steels is a multi-hour, sometimes multi-day hardening process carried out at ferritic temperatures and including a complete heat treatment cycle: normalizing, austenitizing, martensitic quenching and tempering. An alternative, subcritical-temperature austenitic nitriding process is evaluated with the purpose of accelerating the treatment and optimizing the hardness and toughness of nitrided layers while minimizing the distortion of steel parts treated. The alternative process involves liquefied nitrogen cryogenic quenching as well as aging. This study presents results of experimental work on AISI 4140 steel, examining the interplay between the nitriding and tempering conditions and phase transformations in both ferritic (525oC) and subcritical, nitrogen-austenitic (610oC) processes. Thermodynamic models, used to design processing conditions, are applied also in the microstructural interpretation of nitrided layers. Results are verified using the SEM, EPMA and EDS techniques. Kinetics of interstitial diffusion, isothermal martensite transformation, as well as dimensional control of nitrided parts is also presented. Carburizing is, by far, the most widely adopted method in surface hardening. Problems with intergranular oxidation (IGO), energy efficiency and carbon footprint of conventional endothermic atmosphere (CO-H2-N2) carburizing is forcing heat treating and manufacturing companies to move toward increasingly capital- and operating-cost expensive, low-pressure (vacuum furnace) carburizing methods. In response, a new activated and alternate carburizing method (A2A carburizing) has recently been developed, bridging the endothermic atmosphere and vacuum processes, where a plasma-activated, oxygen-free, non-equilibrium nitrogen-hydrocarbon gas blend is utilized. The optimization of industrial A2A carburizing processes involves improvement of case uniformity of parts at different locations in the charge as well as between different sides on the parts. Connected to the optimization, a computational fluid dynamics (CFD) study is conducted for examination of gas flow field inside the furnace and trays holding steel parts treated. To mitigate soot in the atmosphere and minimize the poorly carburized contact area between parts, effects of different combinations of nitrogen-hydrocarbons mixture on soot formation in atmosphere, deposition on metal surface and graphite growth at carburizing temperature are investigated. N2- 0.4%C3H8-1%CH4 mixture is proven to be able to provide proper carburizing hardened case with less soot in atmosphere, less coke deposition on metal surface, as well as minimized marginally carburized contact zone. A soot formation mechanism for non-equilibrium atmosphere in A2A carburizing is discussed. The carburizing processes have been investigated for decades, yet it still faces challenges concerning performance, reliability and process control. Since carburized parts must meet tolerances and specifications of particular applications, it is necessary to accurately predict carbon concentration profiles as a function of processing conditions. Proper carbon distribution is critical for satisfactory and reliable service life of carburized parts. Based on experimental work and theoretical developments, a software CarbTool© has been created for atmosphere and low pressure carburizing methods which consider the thermodynamics, mass transfer kinetics and carbon diffusion aspects of the carburizing process and the gas-steel interface condition. The models are capable now to accurately predict the surface carbon concentration and the carbon concentration profile in the steel, i.e. the most important outcomes of the process.
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Parascandola, S. "Nitrogen transport during ion nitriding of austenitic stainless steel". Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29591.

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Hubbard, Paul, i paul hubbard@rmit edu au. "Characterisation of a Commercial Active Screen Plasma Nitriding System". RMIT University. Applied Physics, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090212.161932.

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Nitriding is a plasma based processing technique that is used to improve the surface properties of components and products in many areas including the aerospace, automotive and biomedical industries to name a few. Active Screen Plasma Nitriding (ASPN) is a relatively new nitriding technique which has potential advantages over the more traditional nitriding techniques such as Direct Current (DC) plasma nitriding where high substrate biases can be problematic. However, there is considerable debate as to the mechanism for nitriding in ASPN. This thesis focuses on investigating the mechanism for nitriding in a commercial ASPN system. Commercial ASPN treatments of nitrideable alloy steels were found to be unsatisfactory unless a sufficient bias was applied. The level of bias required to produce a satisfactory nitriding response, in terms of the cross sectional hardness, was found to depend on the concentration of strong alloy nitride forming elements present in the steel. Although active screen material was found to be transferred to the workload, no evidence was found that this process played a significant role in enhancing the nitriding response. The primary mechanism for nitrogen mass transfer in ASPN was found to be dependent on the active screen/workload separation distance. When this separation is small (less than approximately 10cm for the conditions used in this study) then nitrogen mass transfer in the form of energetic ions or neutrals can occur between the active screen and the workload. This allows samples to be treated without a substrate bias. On the other hand, when the active screen/workload separation distance is large (greater than approximately 10cm) as is normally the case in a commercial environment, this mechanism for nitrogen mass transfer breaks down and a substrate bias is essential. In this latter case, nitrogen ions attracted to the workload using a bias is the primary nitrogen mass transfer mechanism and the role of the active screen is primar ily to uniformly heat the workload.
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Książki na temat "Nitriding"

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Aghajani, Hossein, i Sahand Behrangi. Plasma Nitriding of Steels. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-43068-3.

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M, Lakhtin I͡U︡, red. Teorii͡a︡ i tekhnologii͡a︡ azotirovanii͡a︡. Moskva: "Metallurgii͡a︡", 1991.

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Ramchandani, Ajit. Nitriding of austenitic stainless steel. Birmingham: University of Aston. Department of Mechanical and Production Engineering, 1985.

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Sharif, Shahed. Process development of high pressure nitriding. Birmingham: University of Birmingham, 1997.

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Wołowiec-Korecka, Emilia. Carburising and Nitriding of Iron Alloys. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-59862-3.

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International, Conference on Ion Nitriding (1st 1986 Cleveland Ohio). Ion nitriding: Proceedings of an International Conference on Ion Nitriding, Cleveland, Ohio, USA, 15-17 September 1986. [Metals Park, Ohio]: ASM International, 1987.

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Spalvins, Talivaldis. Advances and directions of ion nitriding/carburizing. Cleveland, Ohio: Lewis Research Center, 1989.

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Betz, Juergen. Laser and plasma nitriding of titanium alloys. Birmingham: University of Birmingham, 1988.

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Center, Lewis Research, red. Advances and directions of ion nitriding/carburizing. Cleveland, Ohio: Lewis Research Center, 1989.

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International Conference on Ion Nitriding. Ion nitriding and ion carburizing: Proceedings of ASM's 2nd International Conference on Ion Nitriding/Carburizing, Cincinnati, Ohio, USA, 18-20 September 1989 / edited by T. Spalvins and W.L. Kovacs ; sponsored by ASM International ; co-sponsored by NASA Lewis Research Center. Materials Park, OH: ASM International, 1990.

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Części książek na temat "Nitriding"

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Gooch, Jan W. "Nitriding". W Encyclopedic Dictionary of Polymers, 485–86. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7908.

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Xu, Zhong, i Frank F. Xiong. "Plasma Nitriding". W Plasma Surface Metallurgy, 13–21. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5724-3_2.

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Babul, Tomasz. "Gas Nitriding". W Encyclopedia of Tribology, 1455–60. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_719.

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Pye, David. "Nitriding and Nitrocarburizing". W Encyclopedia of Tribology, 2421–28. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_1191.

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Aghajani, Hossein, i Sahand Behrangi. "Conventional DC Plasma Nitriding". W Plasma Nitriding of Steels, 9–69. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43068-3_2.

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Aghajani, Hossein, i Sahand Behrangi. "Active Screen Plasma Nitriding". W Plasma Nitriding of Steels, 127–59. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43068-3_4.

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Aghajani, Hossein, i Sahand Behrangi. "Radiofrequency (RF) Plasma Nitriding". W Plasma Nitriding of Steels, 161–81. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43068-3_5.

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Okumiya, Masahiro, Hiroshi Ikeda i Yoshiki Tsunekawa. "Study on Nitriding Mechanism for Aluminum Using Barrel Nitriding". W Solid State Phenomena, 137–42. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-25-6.137.

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Aghajani, Hossein, i Sahand Behrangi. "Introduction". W Plasma Nitriding of Steels, 1–8. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43068-3_1.

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Aghajani, Hossein, i Sahand Behrangi. "Pulsed DC Glow Discharge Plasma Nitriding". W Plasma Nitriding of Steels, 71–125. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43068-3_3.

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Streszczenia konferencji na temat "Nitriding"

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Winter, Karl-Michael. "Simulation of Nitriding Processes". W HT 2015. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.ht2015p0446.

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Abstract In the past there have been many attempts to predict nitriding and nitrocarburizing results. Most of the existing scientific work has been focusing on applying thermodynamics on pure iron and binary or ternary alloys with nitride-forming elements and/or carbon. While in pure iron, solubility for nitrogen and interfaces to Fe4N and Fe2-3N nitrides can be derived from the iron-nitrogen phase diagram [1,2,3] and likewise the solubilities for nitrogen and carbon and the resulting interfaces to Fe3C cementite and Fe2-3NC carbonitrides can be derived from the iron-nitrogen-carbon phase diagram [4,5], the presence of nitride and carbide forming elements in real steels has a tremendous influence on the growth kinetics of the diffusion layer as well as of the compound layer. In addition, when treating steel parts, the pre-nitriding condition of the material has to be taken into account. In order to adjust to such a complexity, a more pragmatic approach is used in models that are using a steel database with empirically derived data for later interpolation to predict the outcome in not tested process conditions [6, 7]. This paper will present a new approach were thermodynamic and kinetic effects are calculated based on material composition and pre-nitrided condition. The model is able to simulate up to three-stage recipes with varying temperature and nitriding as well as carburizing potentials, also taking nucleation time into account. The simulation result is giving compound layer thickness, precipitation layer and total diffusion depth and calculates surface hardness, core hardness and effective case depth (core + 50 HV).
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Chatterjee, Madhu S., i Roxana Ruxanda. "Specifying Nitriding Process Requirements". W HT 2015. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.ht2015p0167.

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Abstract Discovering microstructural features of white layer in a nitrided part has appealed to many scientists and researchers. A slight change in microscopic properties can bring a huge difference in their macro-scale behavior. A thorough knowledge of the compound (the white layer) and of the diffusion zone will enable materials scientists to monitor the grain size (the phases within the material), which alter the macro-scale toughness and strength and finally the amount of porosity. Unlike carburizing, which is a more matured technology, nitriding specifications are genetically stated as surface hardness and hardness at depths. No constituents or type and percent of compounds are mentioned. This paper will attempt to address methodologies used to identify different constituents of both the compound and the diffusion layers of a nitrided part. Three different materials have been heat treated for this study. Three different methods of investigation were used: optical microscopy, electron dispersive spectroscopy (EDS) and electron probe microanalysis (EPMA). This is the beginning of a series of investigations which are underway. In this article, information already known will be the starting point. In future articles, more in depth investigation of the white layer and of the diffusion zone will be shown.
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Skalecki, Marian Georg, Heinrich Klümper-Westkamp, Franz Hoffmann, Hans-Werner Zoch, Sebastian Bischoff i Jörn Rohde. "Plasma Nitriding Potential and a New Modeling Approach for Plasma Nitriding Process Control". W HT 2015. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.ht2015p0325.

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Abstract Plasma nitriding is a thermochemical surface heat treatment of steel components to produce nitride layers which increase wear-, corrosion- and fatigue resistance. Research into plasma nitriding lately showed that there is a significant and characteristic amount of ammonia formed off the process gases nitrogen and hydrogen. This research paper is aimed to analyze the influence of plasma treatment parameters, such as pressure, voltage, temperature and nitrogen to hydrogen ratio on the atmosphere and the formation of ammonia during plasma nitriding. The ammonia content is measured in the exhaust gas. By correlating the measured ammonia with the treatment parameters and modeling the nitriding process, the ammonia content can then be predicted. Further a plasma nitriding potential, comparable to the gas nitriding potential, based on ammonia content is calculated and its practicability as process control parameter is shown by correlating the potential with the nitriding results, e.g. the formation of ε and γ’ nitride phases.
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Poor, Ralph. "Advances in Plasma Ion Nitriding". W HT2019. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.ht2019p0160.

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Abstract The ion or plasma nitriding process has been around for many decades. Developed in the late 1930s, the process was used extensively in Europe. During the 1980s, the process became more popular in the U.S., and many systems were purchased. Early on, the process was not widely understood, and some applications were not a good fit. As plasma nitriding advantages and limitations became realized, the process found its niche in many different industries. Very demanding applications proved to be good applications for ion over gas nitriding. In general, plasma nitriding uses high voltage power operating in the 500–100VDC range, often conducting hundreds of amps to power the process by activating the glow discharge. The glow discharge is not only capable of heating the parts but also ionizes the atmosphere to allow the process to operate. This paper provides insight into plasma nitriding and discusses new advances, widening the range of applications for the process. Many of the advances are in the form of advanced process control electronics, mass flow controllers for process gas flow, and, most importantly, newer high voltage power supply designs with high speed microprocessor arc detection technology.
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Heineck, S., i Frank Theisen. "Controlled Gas Nitriding/Nitrocarburizing Process Control and Precalculation Possibilities". W HT 2015. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.ht2015p0287.

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Abstract Controlled gas nitriding is recognized as optimization of component properties by creating nitride layers with a defined layer structure corresponding to the demands. Requirements are: • Knowledge about the optimal layer structure for a given component stress that enables specifications about the structure stress-related surface layer. • Knowledge about the behaviour of components during nitriding depending on material and nitriding conditions as basis for material selection and the selection of technological parameters. • The measurement and control of nitriding conditions, especially the nitriding potential as basis for a controlled process control.
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Matsubara, Naoya, Ikuo Shohji i Hideyuki Kuwahara. "Erosion Behavior of Plasma Nitriding Stainless Steel by Molten Sn-Ag-Cu Lead-Free Solder". W ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/ipack2011-52026.

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The erosion behavior of plasma nitriding SUS304 stainless steel by molten lead-free solder was examined. Plasma nitriding treatment was conducted to the surface of SUS304 steel. The thickness of the nitriding layer was approximately 17 μm. The layer mainly consists of Fe4N, CrN and Cr2N. Erosion of nitriding SUS304 stainless steel was observed after erosion test with molten Sn-3Ag-0.5Cu (mass%) solder at 450°C for 100 h. On the basis of the result of microstructure observation, it was found that Sn diffusion into the nitrided layer occurred in non eroded area. The result shows that Sn diffusion into the nitrided layer induces erosion of plasma nitriding stainless steel.
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Nestler, M. C., H. J. Spies i K. Herrmann. "Process Combination Thermal Spraying/Nitriding—Wear, Corrosion Resistance, and Coating Structure". W ITSC 1997, redaktor C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0369.

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Abstract At the present, components which require both nitriding and locally a thermal sprayed coating or nitrided components which should l)e reworked are usually nitrided before spraying and the area to be coated is masked during nitriding or is prepared before spraying by locally removing the nitrided layer by grinding. Seen technically, advantages are to be expected if the nitriding process can be carried out after spraying. Moreover a post-nitriding of thermal sprayed coatings is of interest for improving coating characteristics, mainly wear resistance. Understanding the behaviour of sprayed coatings during nitriding in comparison to bulk materials will help to understand generally the behaviour of such coatings in gas atmospheres at increased temperatures. The objectives of the project are the investigation of the interaction between thermal spraying and nitriding, and the optimisation of both processes to achieve improved bonding, wear and corrosion characteristics respectively to get nitriding of the substrate through the coating without spalling or cracking. Furthermore the behaviour and structural changes of different coatings at increased temperatures are determined. The metallographic, X-ray, wear and corrosion results of the resulting compound coatings and parts are presented. Possible new applications are discussed. The project is funded by the German Research Ministry.
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Zhao, Jingyi, G. X. Wang, Yalin Dong i Chang Ye. "A Cellular Automata Model for Nitriding of Nanocrystalline Iron". W ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9316.

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In this study, a numerical model was developed to investigate the effects of grain refinement on the efficiency of nitrogen diffusion during the nitriding process. A cellular automata (CA) model without considering the effects of grain boundaries was built to simulate the nitriding process. The results from the numerical model were compared and validated by experimental data in the literature. Then, nanoscale grain boundaries were integrated into this CA model. The nitriding efficiency in materials with different grain sizes was investigated. The results demonstrate that nanocrystallization can significantly increase the nitrogen diffusion efficiency and thus make low temperature (300°C) nitriding possible.
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Schaaf, Peter, Christof Illgner, Felix Landry i Klaus-Peter Lieb. "Laser nitriding and ion beam analysis". W The fifteenth international conference on the application of accelerators in research and industry. AIP, 1999. http://dx.doi.org/10.1063/1.59282.

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Tarelnyk, Viacheslav, Oksana Gaponova, Vasyl Martsynkovskyy, Ievgen Konoplianchenko, Viktor Melnyk, Vitaliy Vlasovets, Marina Mikulina i in. "New Process for Nitriding Steel Parts". W 2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2021. http://dx.doi.org/10.1109/nap51885.2021.9568563.

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Raporty organizacyjne na temat "Nitriding"

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Haggerty, J. S. Identification of nitriding mechanisms in high purity reaction bonded silicon nitride. Office of Scientific and Technical Information (OSTI), marzec 1993. http://dx.doi.org/10.2172/10140324.

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Haggerty, J. S. Identification of nitriding mechanisms in high purity reaction bonded silicon nitride. Office of Scientific and Technical Information (OSTI), marzec 1993. http://dx.doi.org/10.2172/6632571.

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Kawasaki, Kaoru, Katsuya Ujita, Jun Takahashi, Masaaki Sugiyama i Kazuto Kawakami. Mechanical Properties and Microstructure Change in Nitriding Processes of Cu-Added Steels. Warrendale, PA: SAE International, wrzesień 2005. http://dx.doi.org/10.4271/2005-08-0528.

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Bikyashev, Envyar. Effect of reduction/nitriding on structure and photocatalytic activity of tin dioxide. Peeref, lipiec 2023. http://dx.doi.org/10.54985/peeref.2307p5860746.

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Shao, Lin, Don A. Lucca, Michael Short i Frank Garner. Advanced surface plasma nitriding for development of corrosion resistant and accident tolerant fuel cladding: Final Report. Office of Scientific and Technical Information (OSTI), luty 2019. http://dx.doi.org/10.2172/1497857.

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