Título

THE USE OF CATHODIC CAGE PLASMA NITRIDING FOR IMPROVEMENT THE SLIDING WEAR RESISTANCE OF AISI H-13 TOOL STEEL BLADES FOR CUTTING HOT STEEL STRIPS

THE USE OF CATHODIC CAGE PLASMA NITRIDING FOR IMPROVEMENT THE SLIDING WEAR RESISTANCE OF AISI H-13 TOOL STEEL BLADES FOR CUTTING HOT STEEL STRIPS

Autoria

JÚNIOR, ADONIAS RIBEIRO FRANCO; JÚNIOR, JOSÉ CARLOS DE PONTES; CACERES, JAIME ALBERTO SANCHEZ; JANTORNI, BEATRIZ CAPUCHO; MAIA, GUILHERME ALVERNAZ DA SILVA

JÚNIOR, ADONIAS RIBEIRO FRANCO

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JÚNIOR, JOSÉ CARLOS DE PONTES

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CACERES, JAIME ALBERTO SANCHEZ

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JANTORNI, BEATRIZ CAPUCHO

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MAIA, GUILHERME ALVERNAZ DA SILVA

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DOI

10.5151/2594-5297-41136

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Resumo

AISI H13 HOT WORK TOOL STEEL IS WIDELY USED IN APPLICATIONS SUCH AS METAL FORMING AND MACHINING, WHERE ITS SURFACE IS UNDER SEVERE CONDITIONS OF MECHANICAL STRESSES AND SLIDING WEAR AT HIGH TEMPERATURES. THE PRESENT WORK AIMS TO INCREASE THE ABRASIVE WEAR RESISTANCE OF THIS MATERIAL APPLIED AS SHEAR BLADES FOR CUTTING HOT STEEL STRIPS. FOR SUCH PURPOSE, CATHODIC CAGE PLASMA NITRIDING (CCPN) EXPERIMENTS WERE CARRIED OUT VARYING BOTH TREATMENT TEMPERATURE AND TIME, AS WELL AS THE CONTENT OF NITROGEN IN THE GASEOUS ATMOSPHERE, PRODUCING NITRIDED LAYERS WITH DIFFERENT DEPTHS AND MICROSTRUCTURES ON THE MATERIAL SURFACE. THE RESULTS SHOWED THAT MAXIMUM WEAR RESISTANCE IS ACHIEVED WHEN CCPN IS CARRIED OUT AT 520°C, FOR 10 H, USING 20% N2 IN THE GASEOUS ATMOSPHERE. UNDER SUCH CONDITION, A NITRIDED LAYER OF ABOUT 200 μM THICKNESS, FREE OF WHITE LAYER AND PRECIPITATES IN GRAIN BOUNDARY, IS OBTAINED. INCREASING THE AMOUNT OF NITROGEN IN THE GASEOUS ATMOSPHERE UP TO 30% NITROGEN ALSO LED TO A SIGNIFICANT INCREASE IN THE SURFACE HARDNESS; HOWEVER, NO ADDITIONAL INCREASING IN THE ABRASIVE WEAR RESISTANCE OF THE MATERIAL IS OBTAINED DUE TO LOWER LAYER THICKNESS.

AISI H13 HOT WORK TOOL STEEL IS WIDELY USED IN APPLICATIONS SUCH AS METAL FORMING AND MACHINING, WHERE ITS SURFACE IS UNDER SEVERE CONDITIONS OF MECHANICAL STRESSES AND SLIDING WEAR AT HIGH TEMPERATURES. THE PRESENT WORK AIMS TO INCREASE THE ABRASIVE WEAR RESISTANCE OF THIS MATERIAL APPLIED AS SHEAR BLADES FOR CUTTING HOT STEEL STRIPS. FOR SUCH PURPOSE, CATHODIC CAGE PLASMA NITRIDING (CCPN) EXPERIMENTS WERE CARRIED OUT VARYING BOTH TREATMENT TEMPERATURE AND TIME, AS WELL AS THE CONTENT OF NITROGEN IN THE GASEOUS ATMOSPHERE, PRODUCING NITRIDED LAYERS WITH DIFFERENT DEPTHS AND MICROSTRUCTURES ON THE MATERIAL SURFACE. THE RESULTS SHOWED THAT MAXIMUM WEAR RESISTANCE IS ACHIEVED WHEN CCPN IS CARRIED OUT AT 520°C, FOR 10 H, USING 20% N2 IN THE GASEOUS ATMOSPHERE. UNDER SUCH CONDITION, A NITRIDED LAYER OF ABOUT 200 μM THICKNESS, FREE OF WHITE LAYER AND PRECIPITATES IN GRAIN BOUNDARY, IS OBTAINED. INCREASING THE AMOUNT OF NITROGEN IN THE GASEOUS ATMOSPHERE UP TO 30% NITROGEN ALSO LED TO A SIGNIFICANT INCREASE IN THE SURFACE HARDNESS; HOWEVER, NO ADDITIONAL INCREASING IN THE ABRASIVE WEAR RESISTANCE OF THE MATERIAL IS OBTAINED DUE TO LOWER LAYER THICKNESS.

Palavras-chave

Shear blade for cutting steel strips; AISI H13 hot work tool steel; Cathodic cage plasma nitriding.

Shear blade for cutting steel strips; AISI H13 hot work tool steel; Cathodic cage plasma nitriding; Abrasive wear resistance