On the wear and corrosion of plasma nitrided AISI H13

Fernandes, Frederico Augusto Pires; Heck, Stênio Cristaldo; Picone, Carlos Alberto; Casteletti, Luíz Carlos

doi:10.1016/j.surfcoat.2019.125216

Cited by 37 publications

(12 citation statements)

References 37 publications

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“…On the other hand, increase in austenitizing temperature, providing higher core hardness (51-53 HRC) but much lower toughness (<30 MPa √ m; Figure 3) resulted in about 30% higher wear of the investigated AISI H11 tool steel, both at room and high temperature sliding. In this case wear resistance of plasma nitrided tool steel has been found more or less unaffected by core hardness, but mainly defined by reduced fracture toughness, which is further escalated by nitriding and formation of hard brittle surface zone [43].…”

Section: Thermo-chemical Treatment Vs Coatingmentioning

confidence: 99%

Properties of Tool Steels and Their Importance When Used in a Coated System

Podgornik¹,

Sedlaček²,

Žužek³

et al. 2020

Coatings

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The introduction of new light-weight high-strength materials, which are difficult to form, increases demands on tool properties, including load-carrying capacity and wear resistance. Tool properties can be improved by the deposition of hard coatings but proper combination and optimization of the substrate properties are required to prepare the tool for coating application. The aim of this paper is to elaborate on tool steel substrate properties correlations, including hardness, fracture toughness, strength and surface quality and how these substrate properties influence on the coating performance. Results show that hardness of the steel substrate is the most influential parameter for abrasive wear resistance and load-carrying capacity, which is true for different types of hard coatings. However, high hardness should also be accompanied by sufficient fracture toughness, especially when it comes to very hard and brittle coatings, thus providing a combination of high load-carrying capacity, good fatigue properties and superior resistance against impact wear. Duplex treatment and formation of a compound layer during nitriding can be used as an additional support interlayer, but its brittleness may result in accelerated coating cracking and spallation if not supported by sufficient core hardness. In terms of galling resistance, even for coated surfaces substrate roughness and topography have major influence when it comes to hard ceramic coatings, with reduced substrate roughness and coating post-polishing providing up to two times better galling resistance.

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Section: Thermo-chemical Treatment Vs Coatingmentioning

confidence: 99%

Properties of Tool Steels and Their Importance When Used in a Coated System

Podgornik¹,

Sedlaček²,

Žužek³

et al. 2020

Coatings

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show abstract

“…The different nitriding temperatures can obtain different compound structures which are directly related to the surface hardness of the specimen. According to Reference [33], when the nitriding temperature is relatively low, the thickness of the nitriding layer and the diameter of the nitride particles are relatively small. Then, the surface hardness is also relatively low.…”

Section: Microhardnessmentioning

confidence: 99%

Investigation of the Surface Properties and Wear Properties of AISI H11 Steel Treated by Auxiliary Heating Plasma Nitriding

et al. 2020

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This paper presents an auxiliary heating method to maintain a uniform specimen temperature and precisely control nitriding temperature during plasma nitriding. The surface properties and wear properties of AISI H11 steel treated by auxiliary heating plasma nitriding are investigated. Firstly, the specimens with different diffusion layers and different hardness levels are fabricated through changing the plasma nitriding temperature. Secondly, the surface properties of the plasma-nitrided H11 steel specimens are characterized by a scanning electron microscope (SEM), X-ray diffractometer, metallographic microscope and microhardness tester. The results show that the surface hardness of the plasma-nitrided specimen is almost twice as high as that of the untreated specimen. The thickness of diffusion layer increases with the increase of nitriding temperature. However, the surface hardness firstly increases and then decreases with the increase of the nitriding temperature. Finally, the wear properties of untreated and plasma-nitrided H11 steel specimens are investigated under different friction conditions. The results show that the plasma-nitriding method can significantly improve the wear resistance of AISI H11 steel. The friction coefficient fluctuations of the plasma-nitrided specimens are all lower than those of the untreated specimens. In addition, the wear rates of the plasma-nitrided specimens rise along with load, and reduce along with the sliding speed and friction temperature.

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“…O menor volume de desgaste foi obtido pela amostra nitretada a 450°C, que obteve uma menor espessura de camada total (tanto de camada de difusão quanto de camada composta) e uma maior uniformidade na camada de composto, o que promove uma maior resistência ao desgaste. O resultado obtido corrobora com o observado por Pereira Neto et al 16 , que analisou a resistência ao desgaste do aço Inoxidável Super duplex F53, nitretado a plasma durante 2h, com uma proporção gasosa de 80%N 2 -20%H 2 , variando a temperatura em 350, 400, 450, 500, 550 e 570°C. O menor volume de desgaste obtido foi na amostra nitretada a 400°C, que apresentou uma camada de composto uniforme e de menor espessura.…”

Section: Resultados E Discussões Efeito Da Temperaturaunclassified

Estudo do efeito da nitretação iônica a plasma na resistência ao desgaste do aço SAE 1020 utilizado em matriz de conformação

Danelon¹,

Soares²,

Manfrinato³

et al. 2020

RBAV

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O aço 1020, apesar de apresentar resistência mecânica adequada para conformação e corte do alumínio, sofre desgaste, diminuindo sua eficiência em serviço. Para evitar isto, pode-se recorrer a tratamentos termoquímicos, como a nitretação iônica a plasma, que promove a difusão do nitrogênio formando nitretos na superfície do material, aumentando a resistência ao desgaste, à corrosão e à fadiga do material. Assim, estudou-se o efeito do fluxo (500 sccm e 750 sccm), da temperatura (400, 450, 500, 550 e 600°C) e da proporção dos gases (5%N 2 +95%H 2 , 20%N 2 +80%H 2 , 50%N 2 +50%H 2 e 80%N 2 +20%H 2) na resistência ao desgaste do aço 1020 tratado por nitretação iônica a plasma. Analisando-se a variação da temperatura, a melhor condição de resistência ao desgaste foi obtida a 450°C. Observando-se a mudança de proporção gasosa, o melhor resultado em desgaste foi obtido para 20%N 2 +80%H 2. Alterando-se os fluxos, o menor volume de desgaste foi obtido para a amostra tratada com 500 sccm. O resultado comum entre os parâmetros que proporcionaram maior resistência ao desgaste foi alcançado com a obtenção de camada composta fina e dura de nitretos na superfície tratada, devendo-se buscar esta condição para obter uma melhor resistência ao desgaste do material estudado.

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On the wear and corrosion of plasma nitrided AISI H13

Cited by 37 publications

References 37 publications

Properties of Tool Steels and Their Importance When Used in a Coated System

Properties of Tool Steels and Their Importance When Used in a Coated System

Investigation of the Surface Properties and Wear Properties of AISI H11 Steel Treated by Auxiliary Heating Plasma Nitriding

Estudo do efeito da nitretação iônica a plasma na resistência ao desgaste do aço SAE 1020 utilizado em matriz de conformação

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