Mechanical and microstructural aspects of C20-steel blades subjected to gas nitriding

Kucharska, Barbara; Michalski, Jerzy; Wójcik, Grzegorz

doi:10.1016/j.acme.2018.09.006

Cited by 14 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the area below the iron nitride layer, there is an area called the inner nitriding layer. It consists of nitrogen saturated ferrite with precipitates of γ′ nitrite, while deeper it is found only nitrogen ferrite -α (N) [3,6].…”

Section: Fig 3 Presentation Of Treated Samplesmentioning

confidence: 96%

“…The nitrogen source in these processes is ammonia (NH3). Under the process conditions, the ammonia adsorbed on the surface of the treated steel undergoes a gradual dissociation and thus the atomic nitrogen formed diffuses into the steel as shown in Figure 1a; Figure 1b shows the Fe-N diagram [3]. The structure of the nitrated layer depends on the temperature values, the nitrogen potential, according to the Lehrer diagram [4] and the used steel [5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Considerations Regarding the Influence of the Gaseous Nitriding of the AISI1212 Steel on the Behavior at Atmospheric Corrosion

Maria¹

2019

RECENT

View full text Add to dashboard Cite

Given the wide field of use of the AISI1212 steel as well as the conditions required by its exploitation, we have considered a study to look at the possibilities of improving the mechanical properties and increasing the corrosion resistance up to the degradation factors of the metallic structure. This consisted in performing the thermochemical treatment of nitriding in a gas mixture, which has the effect of increasing surface hardness, long-term vibration resistance and obtaining an anti-corrosive protective layer. We aimed to obtain superior characteristics for it through the diffusion of nitrogen in the layer, in comparison with the classical heat treatment [1, 2].

show abstract

Section: Fig 3 Presentation Of Treated Samplesmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Considerations Regarding the Influence of the Gaseous Nitriding of the AISI1212 Steel on the Behavior at Atmospheric Corrosion

Maria¹

2019

RECENT

View full text Add to dashboard Cite

show abstract

“…The gas nitriding technique is not recommended for stainless steel because of the high chromium content. The chemical composition of steels leads to the formation of a chromium oxide layer on the steel surface, acting as a protective film, and preventing the diffusion of nitrogen in the sample [28].…”

Section: Conventional Nitriding Techniquesmentioning

confidence: 99%

Synthesis of TiN and TiO2 thin films by cathodic cage plasma deposition: a brief review

Abreu

Naeem

Borges

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

The cathodic cage plasma deposition (CCPD) is an advanced technique recently developed from an active screen plasma nitriding system, which has been used for thin film deposition such as titanium nitride and titanium dioxide (TiO 2). These coatings can improve the physical, mechanical, and optical properties of numerous materials, and such coatings can be developed by several techniques. Unfortunately, the conventional deposition techniques exhibit certain drawbacks, including high cost, the complexity of the operation, very low pressure, and high processing temperature; as a result, CCPD is an advantageous technique. In this review, brief information on the deposition of titanium nitride and oxide coatings on steel alloys, titanium, glass, and silicon substrates, and the effect of control parameters on deposition efficiency is provided. The effectiveness of this system for the synthesis of thin films on various substrates, including insulators and conductors, is also summarized. The recent developments and applications of CCPD for titanium-based coatings are described in detail.

show abstract

“…Nitriding process is well-known as a technique of surface treatment that improves the mechanical properties of metallic materials [1]. The most common methods of nitriding are as follows: controlled gas nitriding [2][3][4][5][6], plasma nitriding [7][8][9][10][11][12], and low-pressure gas nitriding [13,14]. Controlled gas nitriding and low-pressure gas nitriding is commonly used for constructional and tool steels.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of thick and porous ε (Fe 2-3 N) iron nitrides was particularly inadvisable. Therefore, in recent years, controlled gas nitriding has been intensively developed [2][3][4][5][6]. The process parameters, characteristic of the nitriding atmosphere, were as follows: the nitriding potential (K N ), the ammonia dissociation rate (α), the percentage composition of gaseous components of the atmosphere, and the flow rate (F In ).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Temperature Distribution during Laser Heat Treatment of Gas-Nitrided 42CrMo4 Steel on the Microstructure and Mechanical Properties

et al. 2020

Self Cite

View full text Add to dashboard Cite

A gas-nitrided layer was produced on the toughened 42CrMo4 low-alloy steel using the changeable nitriding potential in order to limit the thickness of a brittle ε zone. The microstructure consisted of the compound ε + (ε + γ’) zone and diffusion zone (nitric sorbite with γ’ precipitates). Such a layer was subjected to laser heat treatment with or without remelting. The single laser tracks were formed using various laser beam powers (in the range of 0.234–0.624 kW) and scanning rates (in the range of 2.24–3.84 m·min−1) and the same laser beam diameter (2 mm). The microstructure of laser-modified nitrided layer usually consisted of re-melted zone (MZ) with coarse-grained nitric martensite Feα’ and possible ε precipitates, heat-affected zone (HAZ) with fine-grained nitric martensite Feα’ and γ’ precipitates and diffusion zone with nitric sorbite and γ’ precipitates. Sometimes, the compound zone was partially re-melted and an amount of iron nitrides remained in the MZ. Only one laser track was characterized by the different microstructure, consisting of the compound ε + (ε + γ’) zone, HAZ with fine-grained nitric martensite Feα’ and γ’ precipitates and diffusion zone with nitric sorbite and γ’ precipitates. This laser track was formed without visible effects of remelting. The effect of temperature distribution during laser heat treatment of gas-nitrided 42CrMo4 steel on the microstructure and mechanical properties was studied. The equations developed by Ashby and Esterling were used in order to determine the temperature distribution along the axis of each laser track. Taking into account the temperature profiles, it was possible to calculate the depths of MZ and HAZ. These predicted values were compared to those-measured based on the microstructure observations, obtaining good compatibility. The microstructure of the produced surface layers influenced the mechanical properties such as hardness and Young’s modulus. The hardness of MZ was higher than that of ε zone and lower than that of ε + γ’ zone when compared to nitrided layer. Whereas Young’s modulus of MZ was significantly higher than those characteristic of the compound zone in gas-nitrided layer (both ε and ε + γ’ zone) and similar to that of HAZ. The laser heat treatment (LHT) without remelting resulted in the similar hardness and slightly higher Young’s modulus of ε zone in comparison with the nitrided layer. Simultaneously, such a treatment of the nitrided layer did not influence the hardness and the Young’s modulus of ε + γ’ zone considerably. The hardness of HAZ was higher than that of MZ and that of the same area of diffusion zone in the nitrided layer because of the presence of fine-grained nitric martensite with γ’ precipitates after laser quenching.

show abstract

Mechanical and microstructural aspects of C20-steel blades subjected to gas nitriding

Cited by 14 publications

References 3 publications

Considerations Regarding the Influence of the Gaseous Nitriding of the AISI1212 Steel on the Behavior at Atmospheric Corrosion

Considerations Regarding the Influence of the Gaseous Nitriding of the AISI1212 Steel on the Behavior at Atmospheric Corrosion

Synthesis of TiN and TiO2 thin films by cathodic cage plasma deposition: a brief review

The Effect of Temperature Distribution during Laser Heat Treatment of Gas-Nitrided 42CrMo4 Steel on the Microstructure and Mechanical Properties

Contact Info

Product

Resources

About