Low-Temperature Salt Bath Nitriding of Steels

Funatani, Kiyoshi

doi:10.1023/b:msat.0000048834.48163.2e

Cited by 55 publications

(18 citation statements)

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“…In contrast to other surface treatments such as gas nitriding, salt bath nitriding, carbonitriding, and nitrocarburising [12][13][14][15] , in plasma nitriding temperature is not dependent of a conventional heat source. Plasma energy is the heat source and process temperature can be adjusted with plasma voltage and pressure in addition to an external heat source.…”

Section: Introductionmentioning

confidence: 95%

Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings

et al. 2016

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When multifunctional surface engineering processes that combine purpose-oriented phases are applied to soft substrates, a combination of high wear resistance, high load support and low coefficients of friction can be achieved. In this study, the effects of different nitrided layers on the tribological behaviour of a diamond-like carbon (DLC) film deposited on a SAE 1040 steel were investigated. The nitriding was carried out under different temperatures and gas mixtures to create three distinct nitrided layers: two compound layers with predominant ε and γ' phases and a diffusion layer. All of the surfaces were then coated with DLC deposited via plasma-enhanced chemical vapour deposition (PECVD). The tribological tests indicated that the best performance was achieved for a specific combination of hardness, surface roughness and nitride type. The best load-bearing capacity between the DLC coating and the soft substrate was achieved when the nitrided layer was primarily a diffusion layer.

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Section: Introductionmentioning

confidence: 95%

Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings

et al. 2016

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“…In addition, the salt-bath specimen at 300 °C, became coarser was the austempering duration increased (Figure 4). A fully bainite matrix with finer primary carbides can be achieved with a longer austempering time [5,[12][13][14]. However, if the tempering time was insufficient, then no feathery structure was seen in the matrix after etching.…”

Section: Resultsmentioning

confidence: 99%

Microstructures and Mechanical Properties of Austempering SUS440 Steel Thin Plates

Chen

Hung

Lui

et al. 2016

Metals

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SUS440 is a high-carbon stainless steel, and its martensite matrix has high heat resistance, high corrosion resistance, and high pressure resistance. It has been widely used in mechanical parts and critical materials. However, the SUS440 martempered matrix has reliability problems in thin plate applications and thus research uses different austempering heat treatments (tempering temperature: 200˝C-400˝C) to obtain a matrix containing bainite, retained austenite, martensite, and the M7C3 phase to investigate the relationships between the resulting microstructure and tensile mechanical properties. Experimental data showed that the austempering conditions of the specimen affected the volume fraction of phases and distribution of carbides. After austenitizing heat treatment (1080˝C for 30 min), the austempering of the SUS440 thin plates was carried out at a salt-bath temperature 300˝C for 120 min and water quenching was then used to obtain the bainite matrix with fine carbides, with the resulting material having a higher tensile fracture strength and average hardness (HRA 76) makes it suitable for use as a high-strength thin plate for industrial applications.

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“…3,8) Figure 8 is the fracture characteristics of the specimens after each salt bath heat treatments. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Microstructures and Mechanical Properties of Austempering Cr–Mo (SCM 435) Alloy Steel

et al. 2013

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SCM435 is a CrMo alloy steel and it is usually used to make the matrix of tempered-martensite by oil bath method, but it has some problems about reliability in the thin plate specimens. This research used the austempering heat treatment on the SCM435 thin plate specimen with a type of double loop and obtained the CrMo bainite structure, and then we could further investigate the mechanical properties of SCM435 bainite materials. Experimental data showed that the stability of the mechanical properties of the specimen with austempering temperature 830°C for 25 min was better than that of 15 min. The size of the austenite grains affected the strength of thin plate bainite specimen. After austempering at 830°C for 25 min and salt bath at 290°C, the stability of the ultimate tensile strength (UTS) was better than that of the salt bath specimens at 310 and 330°C. The average hardness of all the specimens was more than HRA70. The specimen with austempering at 830°C for 25 min and salt bath at 290°C for 30 min had bigger grain size of the austenite and retained £ phase of 11.4 vol%. It also had higher hardness and strength. So, the austempering SCM435 alloy was improved for tensile strength comparing with traditional oil tempered-martensite process.

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Low-Temperature Salt Bath Nitriding of Steels

Cited by 55 publications

References 1 publication

Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings

Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings

Microstructures and Mechanical Properties of Austempering SUS440 Steel Thin Plates

Microstructures and Mechanical Properties of Austempering Cr–Mo (SCM 435) Alloy Steel

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Low-Temperature Salt Bath Nitriding of Steels

Cited by 55 publications

References 1 publication

Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings

Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings

Microstructures and Mechanical Properties of Austempering SUS440 Steel Thin Plates

Microstructures and Mechanical Properties of Austempering Cr&ndash;Mo (SCM 435) Alloy Steel

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Microstructures and Mechanical Properties of Austempering Cr–Mo (SCM 435) Alloy Steel