Banca de QUALIFICAÇÃO: JORDAN NELSON SOARES CARNEIRO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JORDAN NELSON SOARES CARNEIRO
DATE: 14/11/2022
TIME: 14:00
LOCAL: Sala 414 - CETEC
TITLE:

Nitriding of tool steels: a comparative study of the characteristics of the nitrided layers produced by plasma electrolytic nitriding and by cathodic cage plasma nitriding

KEY WORDS:

tool steels, plasma electrolytic nitriding, surfaces engineering

PAGES: 75
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

In the metal-mechanic industry where tool steels are used in the manufacture of various components, surface refinement plays a vital role to ensure their good performance and durability. In this regard, thermochemical treatments such as nitriding have been used. And among the nitriding processes commonly used, the plasma assisted process has received great attention for ensuring low distortion in the nitrided components and greater control of the nitrided layer, besides being environmentally friendly. Thus, in recent years, different plasma nitriding techniques have been studied, among which we can highlight: the cathodic cage plasma nitriding (NPGC) and the electrolytic plasma nitriding (NPE). Studies carried out in the Plasma Laboratories (LabPlasma) of UFRN/UFPI showed that the NPGC technique was effective in increasing the microhardness and wear resistance of different steels, in particular tool steels of the D and M series. Therefore, in this work, we sought to investigate the effects of the NPE technique on samples of AISI D2 tool steels, AISI D6 and AISI M2 tool steels using an aqueous solution of ammonium nitrate NH4NO3 (100 g/l) with ammonium chloride NH4Cl (150 g/l) and variations of process parameters in order to compare the effectiveness of this technique with that of NPGC by comparing the characteristics of the nitrided layers obtained through NPE with those previously produced in LabPlasma (UFRN/UFPI) through NPGC using a stainless steel cathodic cage AISI 304 and AISI 316. And in order to achieve the objectives of this work, after plasma treatment, the nitrided samples were characterized for surface and profile microhardness. In addition, the morphology and thickness of the nitrided layers were investigated by Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). While the phase compositions of the coatings were identified by X-ray diffraction (XRD).

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