Case Structure and Properties of Nitrided Steels

Spies, H.‐J.; Dalke, Anke

doi:10.1016/b978-0-08-096532-1.01216-4

Cited by 10 publications

(10 citation statements)

References 42 publications

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“…3500 m, and the main reason of failures was the formation of cracks on the surface. Probably, the cracks started in the stress concentration zones formed due to the grain-boundary precipitation of carbonitride particles [25]. The induction hardened tubes had greater service life (approx.…”

Section: Resultsmentioning

confidence: 99%

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Induction surface hardening of 42CrMo4 steel tubes designed for rotary percussive drilling equipment

Майсурадзе¹,

Рыжков²

2016

AIP Conference Proceedings

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Section: Resultsmentioning

confidence: 99%

“…It is considered [24] that the presence of a white nitrided layer with a high hardness and a low friction coefficient reduces the abrasive wear of products and increases the service life of machine parts. On the other hand, carbonitride precipitations on grain boundaries embrittle the steel and cause failures of parts [25].…”

Section: Resultsmentioning

confidence: 99%

Induction surface hardening of 42CrMo4 steel tubes designed for rotary percussive drilling equipment

Майсурадзе¹,

Рыжков²

2016

AIP Conference Proceedings

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“…These indicators will be designated in the following sections as detailed in Table 1. Since they follow the classical and widely reported trends ( [Spies, 2014] [ASM, 1991] [Ginter, 2006]), the effect of nitriding time and temperature on hardness, residual stress and case depth are given in a simple way in Table 1 but not detailed. Increasing temperature or time resulted in an increase of case depth and in a decrease of case hardness and compressive residual stress.…”

Section: Methodsmentioning

confidence: 99%

A Simple Model for Hardness and Residual Stress Profiles Prediction for Low-Alloy Nitrided Steel, Based on Nitriding-Induced Tempering Effects

Thibault

Sidoroff

Jegou

et al. 2018

HTM Journal of Heat Treatment and Materials

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Nitriding of low-alloy steels is widely used for gears and bearings in aerospace industry. Some highly stressed surfaces require high nitrided depth, which involves long time/high temperature nitriding treatment. This study focused on identifying process parameter effects on hardness and residual stress profiles in a large range of nitriding time and temperature. We demonstrate that core and case can be considered as two materials, softening of which can be predicted by two tempering laws. In addition, a basic relationship was derived from the nitriding depth and a pseudo-diffusion coefficient, allowing prediction of the hardness profile. Residual stress results show that the diffusion controlled effect can also be used to predict residual stress profile affected depth. Likewise, the tempering controlled effect can be used to predict surface and maximum values of the residual stress profile.

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“…It is known that the largest NMI within a cyclically loaded volume initiates a fatigue crack, which can be used in particle analysis for defining the maximum inclusion size . This is achievable by cyclic loading in the VHCF regime by ultrasonic fatigue testing (USFT) and by additional protection of the surface from crack initiation (for example, by nitriding) . Cooperative NMI analysis by section imaging, chemical extraction and fractography covers the whole spectrum of size and chemical composition distribution.…”

Section: Introductionmentioning

confidence: 99%

“…[18] This is achievable by cyclic loading in the VHCF regime by ultrasonic fatigue testing (USFT) [19] and by additional protection of the surface from crack initiation (for example, by nitriding). [20] Cooperative NMI analysis by section imaging, chemical extraction and fractography covers the whole spectrum of size and chemical composition distribution.…”

mentioning

confidence: 99%

Effect of Filter Functional Coating on Detrimental Nonmetallic Inclusions in 42CrMo4 Steel and Its Resulting Mechanical Properties

et al. 2019

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Carbon‐bonded ceramic foam filters with different functional coatings are immersed in a 42CrMo4 steel melt within a steel casting simulator. The solidified steel is analyzed with respect to the size distribution and the chemical composition of the remaining nonmetallic inclusions (NMI). Cyclic loading and quasi‐static tests are performed to determine the fatigue limit, the strength, deformability, and toughness of the steel after filter immersion. The immersion of filter with calcium hexaluminate (CA6) coating significantly reduces the population of small (4–20 μm) NMIs. This leads to an increased deformability and, thus, ability for energy dissipation during deformation. However, the maximum size of NMIs is increased from 100 to 150 μm, which results in fatigue limit reduction, despite the decrease in NMIs total density. The majority of inclusions are found to be pure alumina. Large (up to 150 μm) plate‐like alumina inclusions introduce most of the detrimental effects on cyclic strength, whereas significant effect on quasi‐static strength is not found.

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Case Structure and Properties of Nitrided Steels

Cited by 10 publications

References 42 publications

Induction surface hardening of 42CrMo4 steel tubes designed for rotary percussive drilling equipment

Induction surface hardening of 42CrMo4 steel tubes designed for rotary percussive drilling equipment

A Simple Model for Hardness and Residual Stress Profiles Prediction for Low-Alloy Nitrided Steel, Based on Nitriding-Induced Tempering Effects

Effect of Filter Functional Coating on Detrimental Nonmetallic Inclusions in 42CrMo4 Steel and Its Resulting Mechanical Properties

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