Título

MICROSTRUCTURAL AND MICROMECHANICAL CHARACTERIZATION OF A DUPLEX MULTILAYER COATED H13 TOOL STEEL

MICROSTRUCTURAL AND MICROMECHANICAL CHARACTERIZATION OF A DUPLEX MULTILAYER COATED H13 TOOL STEEL

Autoria

Recco, Abel André Cândido; Tschiptschin, André Paulo

DOI

10.5151/2594-5327-17065

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Resumo

Quenched and tempered H13 tool steel was plasma nitrided and PVD coated in a hybrid reactor aiming to obtain a TiN/TiC multi-layer coating deposited on a plasma nitrided substrate, with a more gentle transition of elastic-plastic properties between the outermost layer of the coating and the substrate. Duplex treatment (plasma nitriding and PVD coating) was carried out in a hybrid reactor. Plasma nitriding preceded the DC triode magnetron sputtering PVD process, conducted inside the same chamber, using CH4 and N2 as reactive gases. Multi-layer TiN/TiC coatings deposited on a nitrided H13 substrate were obtained. Deposited TiC layers were characterized as containing 18.4 at% and 32.3 at% C, in a cF8 NaCl type unit cell, respectively. The TiN layer showed 41.9 at% N, also in a cF8 NaCl type unit cell. The multi-layer coating showed a gentle transition of elastic-plastic properties assessed by the H/E* and the H3/E*2 ratios and the elastic recovery as a function of the distance from the surface of the specimen. The adhesion of the multi-layered coating to the substrate was greater in the case of the duplex coated specimen compared to the non duplex treated H13 steel.

 

Quenched and tempered H13 tool steel was plasma nitrided and PVD coated in a hybrid reactor aiming to obtain a TiN/TiC multi-layer coating deposited on a plasma nitrided substrate, with a more gentle transition of elastic-plastic properties between the outermost layer of the coating and the substrate. Duplex treatment (plasma nitriding and PVD coating) was carried out in a hybrid reactor. Plasma nitriding preceded the DC triode magnetron sputtering PVD process, conducted inside the same chamber, using CH4 and N2 as reactive gases. Multi-layer TiN/TiC coatings deposited on a nitrided H13 substrate were obtained. Deposited TiC layers were characterized as containing 18.4 at% and 32.3 at% C, in a cF8 NaCl type unit cell, respectively. The TiN layer showed 41.9 at% N, also in a cF8 NaCl type unit cell. The multi-layer coating showed a gentle transition of elastic-plastic properties assessed by the H/E* and the H3/E*2 ratios and the elastic recovery as a function of the distance from the surface of the specimen. The adhesion of the multi-layered coating to the substrate was greater in the case of the duplex coated specimen compared to the non duplex treated H13 steel.

Palavras-chave

PVD-TiN; PVD-TiC; Plasma nitriding; PVD coating; Multilayer coatings.

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