LOW-TEMPERATURE NITRIDING BEHAVIOR OF COMPRESSIVE DEFORMED AISI 316Ti AUSTENITIC STAINLESS STEELS

Fatih Kahraman, Gökçe Mehmet Gençer (), Ayça D. Kahraman (), Coşkun Yolcu () and Haydar Kahraman ()
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Fatih Kahraman: Engineering Faculty, Mechanical Engineering Department, Dokuz Eylul University, Izmır, Turkey
Gökçe Mehmet Gençer: Engineering Faculty, Mechanical Engineering Department, Dokuz Eylul University, Izmır, Turkey
Ayça D. Kahraman: #x2020;Engineering Faculty, Mechanical Engineering Department, Manisa Celal Bayar University, Manisa, Turkey
Coşkun Yolcu: Engineering Faculty, Mechanical Engineering Department, Dokuz Eylul University, Izmır, Turkey
Haydar Kahraman: #x2021;Engineering Faculty, Metalurgical and Materials Engineering Department, Dokuz Eylul University, Izmır, Turkey

Surface Review and Letters (SRL), 2019, vol. 26, issue 05, 1-8

Abstract: The effects of compressive cold deformation under the quasi-static loads on the nitride formation, nitride layer growth and surface hardness properties were researched in this study. Martensite structure did not form in AISI 316Ti stainless steel as a result of quasi-static deformation. Diffusion layer did not form in all nitrided samples. Both the deformed and undeformed samples have only compound layer on the surfaces at the low-temperature nitriding conditions (400∘C, 7h). According to the X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS) and electron probe microanalysis (EPMA) results, S-phase and chromium nitride (CrN) were formed in the compound layers of the deformed samples. However, CrN did not form in the compound layer of the undeformed sample. The optical microscope (OM) results showed that the compressive cold deformation increased the nitrogen diffusion rate and led to thicker nitrided layer than the undeformed sample under the same plasma-nitriding conditions. All nitrided layers presented higher microhardness values (∼1200HV) when compared with the untreated sample hardness. It was also verified that the deformation amount did not affect significantly the nitrided layer hardness.

Keywords: Low-temperature nitriding; quasi-static deformation; chromium nitride (CrN); compound layer; AISI 316Ti stainless steel (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18501883

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