Microstructure and Residual Stress in AMS 6308 Steel after Vacuum Carburizing and Gas Quenching

Dychtoń, Kamil; Kocurek, Paweł; Rokicki, Paweł; Wierzba, Bartek�; Drajewicz, Marcin; Sieniawski, Jan

doi:10.12693/aphyspola.130.953

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…During the experiments there were ground flat surfaces of samples made of high-alloyed steel Pyrowear 53. That steel is applied for highly loaded machine parts such as elements of power systems, i.e., shafts and gears of highly loaded aviation gear transmissions [38][39][40]. Each of grinding wheels worked with constant values of process parameters such as grinding speed v s , feed speed v w and grinding depth a e .…”

Section: Methodsmentioning

confidence: 99%

Variation of Grain Height Characteristics of Electroplated cBN Grinding-Wheel Active Surfaces Associated with Their Wear

Bazan

Kawalec

Rydzak

et al. 2020

Metals

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During the operation of a single-layer grinding wheel (SLGW), irreversible changes occur on its active surface due to wear. The study of grinding-wheel microgeometry changes can be based on the measurement of the surface texture as well as the determination and analysis of its parameters. The article deals with the selection of suitable texture parameters and an appropriate mathematical model carrying information about the SLGW condition. In the study, samples of Pyrowear 53 steel were ground using electroplated cBN single-layer grinding wheels until they were completely worn out or removed assumed volume of the workpiece material. Each SLGW worked with constant process parameters. Among the 144 parameters tested, the highest sensitivity to changes in wheel active surfaces caused by wear was shown by the mean value of the mean island heights Zmean_m. In-depth research was conducted for Zmean_m and reduced peak height Spk. Compared to Spk, Zmean_m has proven to be a better measure of wear, especially when large areas of sticking occur. Moreover, the second-degree models linking Zmean_m and Spk to the process parameters and the specific material loss were better suited to the empirical data than the exponential models.

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Section: Methodsmentioning

confidence: 99%

Variation of Grain Height Characteristics of Electroplated cBN Grinding-Wheel Active Surfaces Associated with Their Wear

Bazan

Kawalec

Rydzak

et al. 2020

Metals

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“…In the SC process, the distribution of stresses in the surface layer of the gear teeth on the pitch diameter is more even and repeatable than in the CTC process. Moreover, the reduction in the amount of retained austenite within the technological surface layer resulted in an increase in the value of compressive stresses [42][43][44][45]. This state of stress determines the SC machining as the one for which the fatigue strength will probably be characterized by higher values.…”

Section: Xrd Resultsmentioning

confidence: 99%

Minimizing Deformations in High-Temperature Vacuum Carburizing

Atraszkiewicz,

Dybowski

2023

Materials

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This article presents the results of a study on reducing deformations resulting from high-temperature vacuum carburizing and post-carburizing heat treatment. The idea was to increase the strength of steel at elevated temperatures by pre-carburizing at heat-up to the process temperature (SC—stage carburizing). It has been shown that the use of carburizing in stages from a lower temperature to the target temperature, compared to traditional vacuum carburizing at a constant temperature (Constant-Temperature Carburizing—CTC), has a significant impact on the chemical and phase composition of the technological layer, surface after the process and, consequently, on its mechanical properties. It was shown that the retained austenite content after stage carburizing was reduced by approximately 45%, as was the thickness of the gear teeth measured at the pitch diameter. Additionally, uniform stress distribution was demonstrated for the SC process. Carbon saturation of austenite increases the yield strength, and therefore the dimensional stability of steel heat-treated at elevated temperatures also improves, which effectively permits high-temperature treatment of critical steel parts such as, for example, gear wheels, for which high dimensional accuracy is required.

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“…for machine parts. Carbon content, combined with a properly selected amount of alloying elements, allow for long-term operation in demanding conditions [1] There are many ways to improve materials properties through various surface engineering processes, such as: application of wear-resistant coatings by carburizing [2], nitriding [3] diffusion processes as well as hard coatings produced by PVD methods [4]. Diffusion boriding allows increasing the hardness and wearing resistance of steels surface layer.…”

Section: Introductionmentioning

confidence: 99%

The Structure of Boride Diffusion Coatings Produced on Selected Grades of Structural Steels

Góral,

Kościelniak,

Ochał

et al. 2024

SSP

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In the article the microstructure and phase composition of boride coatings deposited on selected structural steels were investigated. The boride coatings were produced using pack cementation method using commercial EKABOR-2 mixture containing of 50 wt. % of new and 50 wt. % of used powder. Boride coatings were deposited on alloyed structural steels grades (PN/EN 10084 standard): 16MnCr5, 18CrNiMo7-6, 41CrAlMo7 42CrMo4. Cylindrical samples with a diameter of 30 mm and a height of 30 mm were boronized in powder at 1000°C for 2, 4 and 6 hours in an argon atmosphere. The process was carried out in an industrial CVD Bernex BPX 325S device. The microstructure was analyzed using scanning electron microscope Phenom XL equipped with EDS spectrometer. The XRD phase analysis was conducted using XTRa diffractometer (ARL). The thickness as well as phase composition was analyzed on coatings formed on each grades of steels. The most of obtained boride coatings were characterized by single-phase structure (Fe2B). The formation of brittle FeB phase was detected only on 16MnCr5 steel grades steels.

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Microstructure and Residual Stress in AMS 6308 Steel after Vacuum Carburizing and Gas Quenching

Cited by 10 publications

References 7 publications

Variation of Grain Height Characteristics of Electroplated cBN Grinding-Wheel Active Surfaces Associated with Their Wear

Variation of Grain Height Characteristics of Electroplated cBN Grinding-Wheel Active Surfaces Associated with Their Wear

Minimizing Deformations in High-Temperature Vacuum Carburizing

The Structure of Boride Diffusion Coatings Produced on Selected Grades of Structural Steels

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