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Diffusion layer growth mechanism in ASPN method using an iron cage for St52 steel
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نویسنده
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salavat m.k. ,soltanieh m. ,hasheminiasari m.
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منبع
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iranian journal of materials science and engineering - 2017 - دوره : 14 - شماره : 2 - صفحه:24 -31
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چکیده
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The mechanism of diffusion layer growth in plasma nitrided coatings applied on a st52 steel using an active screen is investigated. the nitriding was performed at 450,500 and 550 °c temperature nitrtding times of 5. 10 and 15 h. in a gas mixture containing 20 vol. % h2: 80 vol. % n2 and dc-pulsed plasma nitriding unit. the surface,cross section and the thickness of diffusion of specimens was studied in terms of optical and scanning electron microscopy. according to the measurements of diffusion layer thickness,values of q and do for nitrogen diffusion in substrate were calculated as 50585 (j/mol) and 4. 11 × 10-10 (m2/s)respectively the variations of depth of hardness during nitriding period was determined. © 2017,iran university of science and technology. all rights reserved.
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کلیدواژه
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Active screen; AISI St52 tool steel; Diffusion zone; Growth mechanism; Microhardness; Plasma nitriding
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آدرس
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department of materials and metallurgical engineering,iran university of science and technology,tehran, ایران, department of materials and metallurgical engineering,iran university of science and technology,tehran, ایران, department of materials and metallurgical engineering,iran university of science and technology,tehran, ایران
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Authors
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