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Title

Evaluation of niobium nitride coatings produced on AISI ۴۳۰ steel by niobizing and plasma nitriding

دهمین کنفرانس بین المللی مهندسی مواد و متالورژی (iMat۲۰۲۱)
Year: 1400
COI: IMES15_195
Language: EnglishView: 113
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Authors

Nazanin Jalalian Karazmoudeh - Ph.D. Candidate, School of Metallurgy and Materials Engineering, Iran University of Science and technology
Mansour Soltanieh - Professor, School of Metallurgy and Materials Engineering, Iran University of Science and technology
Mahmoud Heydarzadeh Sohi - Professor, School of Metallurgy and Materials, College of Engineering, University of Tehran
Hamed Nadimi - Ph.D., School of Metallurgy and Materials Engineering, Iran University of Science and technology

Abstract:

In this work, AISI ۴۳۰ stainless steel was duplex treated via niobizing followed by plasma nitriding and vice versa. Niobizing was performed through pack cementation in a powder mixture of Al۲O۳, NH۴Cl, and FeNb at ۹۵۰ ̊C for ۲h. Then one group of samples (Nb-PN) were plasma nitrided at ۴۵۰ °C for ۶ h at an atmosphere of ۷۵% N۲ and ۲۵% H۲, and the other group were nitrided and then niobized in a similar condition (PN-Nb). The cross sections and samples surface were investigated by optical and scanning electron microscope (SEM). Phase identification was performed using XRD. The surface hardness and electrochemical behavior of the treated samples were assessed. Results revealed that an approximately ۱۵ μm thick layer that contained NbN, NbCr۲, and Fe۲Nb was formed after duplex treatment. The highest surface hardness value achieved was ۷۵۳ HV۰.۰۹۸ in the Nb-PN sample, which was ۳.۵ times higher than that of the bare stainless steel. Plasma nitriding of the niobized layer caused a significant improvement in corrosion resistance; i.e., the Nb-PN sample reduced the Icorr to a value (۰.۷۲ μA/cm۲) ten times lower than that of the bare stainless steel (۹.۵ μA/cm۲).

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This Paper COI Code is IMES15_195. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/1388827/

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Jalalian Karazmoudeh, Nazanin and Soltanieh, Mansour and Heydarzadeh Sohi, Mahmoud and Nadimi, Hamed,1400,Evaluation of niobium nitride coatings produced on AISI ۴۳۰ steel by niobizing and plasma nitriding,10th International Conference on Materials Science & Metallurgical Engineering (iMat2021),https://civilica.com/doc/1388827

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Type of center: دانشگاه دولتی
Paper count: 23,465
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