High pressure gas quenching: Distortion analysis in gears after heat treatment

Atraszkiewicz, R.; Januszewicz, Bartłomiej; Kaczmarek, Ł.; Stachurski, Wojciech; Dybowski, K.; Rzepkowski, A.

doi:10.1016/j.msea.2012.08.047

Cited by 33 publications

(18 citation statements)

References 10 publications

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“…Moreover, oil quenching installations are are two-chamber furnaces, additionally equipped with an oil bath in which items are quenched. While oil quenching has the disadvantages mentioned above, it has one advantage compared to gas quenching this is higher heat transfer coefficient, which enables the quenching of parts made of steel of lower hardenability; therefore, this cooling method is still applied in industry [10][11][12][13][14]16].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing

Dybowski¹,

Sawicki²,

Kula³

et al. 2016

Archives of Metallurgy and Materials

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This paper presents a comparison of the deformations and residual stresses in gear wheels after vacuum carburizing process with quenching in high-pressure nitrogen and oil. The comparison was made on a medium-sized gear wheels, made of AMS6265 (AISI 9310) steel. This steel is applied in the aerospace industry for gears. The study has provided grounds for an assessment of the effect of the method of quenching on the size of deformations. Compared to oil quenching, high-pressure gas quenching following vacuum carburizing resulted in more uniform and smaller deformations.

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Section: Introductionmentioning

confidence: 99%

“…Hydrogen -because of the high risk of explosions and logistic issues. Currently performed research aim to eliminate this issues by storing hydrogen in metal hydride beds [11,15].…”

mentioning

confidence: 99%

The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing

Dybowski¹,

Sawicki²,

Kula³

et al. 2016

Archives of Metallurgy and Materials

Self Cite

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“…The maximum permissible measurement error when measuring length (distance, diameter, position) MPE E is: (1) where: L -measurement length [mm].…”

Section: Methodsmentioning

confidence: 99%

“…Low-pressure carburizing [6,7,16] is better than conventional carburizing [4,5] in terms of efficiency and it is characterized by a number of advantages, such as lack of internal oxidation, higher uniformity of resulting layers, good energy efficiency and environmental friendliness. At the same time there is a constant increase in requirements regarding, among others, minimizing the negative phenomena resulting in dimensional changes after hardening and enabling the determination of nature and magnitude of these changes [1,3]. The answer to these requirements is the concept of single-piece flow treatment, in which every single item passes through the same process stages and conditions [10÷15].…”

Section: Introductionmentioning

confidence: 99%

Hardening-Related Deformations of Gear Wheels After Vacuum Carburising and Quenching in Gas

Stachurski¹,

Zgórniak²,

Sawicki³

et al. 2017

Adv. Sci. Technol. Res. J.

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The purpose of modern surface hardening technology is obtaining reproducible, precisely planned parameters of the carburized layer, minimizing the negative phenomena that result in dimensional changes after hardening and making it possible to determine the nature and magnitude of these changes. This concerns mainly the concept of singlepiece flow in heat treatment applied for the purposes of mass production, employing a special autonomous 4D Quenching chamber for high pressure gas quenching (HPGQ). The main components of the 4D Quenching chamber include a system of cooling nozzles surrounding the processed item and providing a uniform inflow of cooling gas from all directions (3D) and a table rotating together with the item processed, contributing to uniform cooling (4D). Within the framework of this paper there was studied the impact of gear wheel quenching in a 4D Quenching chamber using nitrogen at pressure of 6 and 10 bar on changes in geometry. Geometric measurements of facewidth of gear, hole diameter and outside diameter were performed before and after carburization and quenching. The results obtained allowed us to determine the impact of quenching pressure inside a 4D Quenching chamber on dimensional changes in gear wheels analyzed. The thermo-chemical treatment resulted in a decrease in outside diameters and hole diameters measured and an increase in facewidth of gears.

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“…This in turn means it is necessary to neutralize drains and use oil residue separators. Additionally, systems with washing appliances occupy more space, whereas compact vacuum systems can be installed in technological lines, thus minimizing inter-operational transport [1,3,9,10,16].…”

Section: Introductionmentioning

confidence: 99%

DISTORTION OF 16MnCr5 STEEL PARTS DURING LOW-PRESSURE CARBURIZING

Dybowski

Niewiedzielski

2017

Adv. Sci. Technol. Res. J.

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One of the many advantages of low pressure carburizing (LPC) is that it can be combined with high-pressure gas quenching. This makes it possible to achieve workpieces with pure metallic surfaces, less distortion hardening, and, above all, it allows a more reliable and repeatable treatment than conventional oil quenching. This article presents a study of the distortion rate of workpieces carburized at low pressure then quenched in nitrogen at 1.4 MPa. By comparing the distortion which takes place during the carburizing stage only and the carburizing combined with post-carburizing heat treatment it will be possible to assess the distortion rate and its causes at the different stages of the heat treatment process.

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High pressure gas quenching: Distortion analysis in gears after heat treatment

Cited by 33 publications

References 10 publications

The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing

The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing

Hardening-Related Deformations of Gear Wheels After Vacuum Carburising and Quenching in Gas

DISTORTION OF 16MnCr5 STEEL PARTS DURING LOW-PRESSURE CARBURIZING

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