Microstructure, Hardness, and Tensile Properties of Vacuum Carburizing Gear Steel

Chen, Wu; He, Xiaofei; Yu, Wantai; Wang, Maoqiu; Yao, Kefu

doi:10.3390/met11020300

Cited by 9 publications

(5 citation statements)

References 22 publications

(34 reference statements)

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“…This indicates that more austenite was retained at a higher austenitizing temperature. Because of the increased number of carbides dissolved into austenite, the carbon content in the austenite is higher [28]. All of the above supports and explains the reasons for increase in wear resistance and hardness with increasing carburizing temperature.…”

Section: Edx Resultsmentioning

confidence: 64%

Evaluation of the Impact of Surface Treatment on the Turbine Blade Performance

2023

jjmie

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The combination of a hard surface and a soft interior is greatly valued in modern engineering because it can withstand very high stress and fatigue, a property that is required in such items as gears, turbine blade and anti-friction bearings. Surface-hardened steel is also valued for its low cost and superior flexibility in manufacturing. This study looked at how the carbonization temp affected the resistance against wear and hardness of the steel alloy utilized to make turbine impellers. The specimens were activated in Co2 at each temperature for soaking at about 30, 60, 90, and 120 minutes. The carbonization temp was changed from 850, 900, and 950 to 1000C°. The Carburized steels are put through various tests, including wear tests utilizing a pin on a desk, hardness tests utilizing a Brinell-hardness tester, and phase observations utilizing an EDX (Energy Dispersive X-Ray). The findings demonstrated that all carburizing temps improved resistance against wear, and the wear rate decreased with rising temp and prolonged immersion in the carburized medium, minimum wear rate founded at 1000C 0 for 2hr as soaking time. Additionally, hardness exhibited the same upward trend in resistance against wear as temp and time and maximum hardness recorded at 1000C for soaking time of 2hr was 106BHN compared with plain material 56BHN. EDX analysis demonstrates that the carburizing process for all treated specimens creates an extra carbon phase.

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Section: Edx Resultsmentioning

confidence: 64%

Evaluation of the Impact of Surface Treatment on the Turbine Blade Performance

2023

jjmie

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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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“…At the atomic The amount of retained austenite increases dramatically with increasing carbon content in room-temperature quenched carbon steel subjected to CHT. Increasing the austenitisation temperature has a similar effect on the RA amount [126,127].…”

Section: Microstructural Changes Due To Cryogenic Treatmentmentioning

confidence: 89%

Cryogenic Treatment of Martensitic Steels: Microstructural Fundamentals and Implications for Mechanical Properties and Wear and Corrosion Performance

Jurči,

Dlouhý

2024

Materials

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Conventional heat treatment is not capable of converting a sufficient amount of retained austenite into martensite in high-carbon or high-carbon and high-alloyed iron alloys. Cryogenic treatment induces the following alterations in the microstructures: (i) a considerable reduction in the retained austenite amount, (ii) formation of refined martensite coupled with an increased number of lattice defects, such as dislocations and twins, (iii) changes in the precipitation kinetics of nano-sized transient carbides during tempering, and (iv) an increase in the number of small globular carbides. These microstructural alterations are reflected in mechanical property improvements and better dimensional stability. A common consequence of cryogenic treatment is a significant increase in the wear resistance of steels. The current review deals with all of the mentioned microstructural changes as well as the variations in strength, toughness, wear performance, and corrosion resistance for a variety of iron alloys, such as carburising steels, hot work tool steels, bearing and eutectoid steels, and high-carbon and high-alloyed ledeburitic cold work tool steels.

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Microstructure, Hardness, and Tensile Properties of Vacuum Carburizing Gear Steel

Cited by 9 publications

References 22 publications

Evaluation of the Impact of Surface Treatment on the Turbine Blade Performance

Evaluation of the Impact of Surface Treatment on the Turbine Blade Performance

Minimizing Deformations in High-Temperature Vacuum Carburizing

Cryogenic Treatment of Martensitic Steels: Microstructural Fundamentals and Implications for Mechanical Properties and Wear and Corrosion Performance

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