Analysis of methods of carburizing of gears from heat-resistant steels

Ryzhov, N. M.; Fakhurtdinov, R. S.; Смирнов, А. Е.; Fomina, L. P.

doi:10.1007/s11041-010-9261-2

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…To improve wear resistance, one strategy is to form hard layers on the surface of 20CrMnTi steel, and the other is to add solid lubricants in the 20CrMnTi matrix. Hard surface layers with different thickness have been achieved by processing technologies such as quenching, carburizing, shot peening, and laser surface modification with ceramic particle addition [3][4][5][6][7][8]. The above approaches have effectively improved the hardness and wear resistance of 20CrMnTi steel.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Mechanical Properties of 20CrMnTi Steel through Microstructure Modification

Men

Lu³

et al. 2022

Coatings

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Microstructure modification is an effective approach to improve the mechanical properties of materials. In the present study, expanded graphite (EG) was added in a 20CrMnTi matrix to form pearlite microstructure and proeutectoid cementite after sintering. Mechanical alloying was used to obtain a fine milled mixture with a ball/powder weight ratio of 20:1. After mechanical alloying for 10 h, the milled mixtures with different EG contents were pressurelessly sintered at 1250 °C for 10 min and then hot-pressed at 1150 °C under 30 MPa for 30 min in Ar to obtain dense and modified 20CrMnTi materials. The content of EG has a profound influence on the microstructure and mechanical properties of 20CrMnTi. A high tensile strength of 1088 MPa and a high Vickers hardness of 4.7 GPa were achieved in the 1% EG-modified 20CrMnTi, which were increased by 105% and 28%, respectively, compared with the pure dense 20CrMnTi. The formed fine pearlite and small proeutectoid cementite in the modified microstructure contributed to the improved mechanical properties of 20CrMnTi.

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Section: Introductionmentioning

confidence: 99%

Improvement of Mechanical Properties of 20CrMnTi Steel through Microstructure Modification

Men

Lu³

et al. 2022

Coatings

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“…Another attractive benefit of the carburization process is the compressive residual stresses development at the surface [1]. Vacuum carburizing occurs in the self-regulation mode consisting of cyclic intervals of saturation and diffusion [2]. Mathematic models of the process connected with numerical simulations are the basic tool for controlling the carburization process [3,4].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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In this work, the vacuum carburizing and gas quenching has been done on gears box made of high strength alloy steel AMS 6308 in four different temperatures. The measurements of hardness was done to evaluate the effective case depth for each temperature. The analysis of retained austenite was presented as a factor which can affect values of residual stress. The residual stresses were measured in Protoi XDR portable diffractometer and the analysis was examined to find influence of temperature and carburizing time on the direction and values of residual stresses.

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“…Most of them concern lowering toxic gases emission in the industrial processes, other lowering fuel consumption and noise by the engines [1]. Heat treatment and thermochemical treatment is one of the crucial technological processes of steels that are of great importance not only in the meaning of final element properties but also of social, environmental and economic importance [2,3,4]. Manufacturers of aircraft engine components all over the world fight with trends in the production to develop and apply newer and more advanced in the technological and innovative meaning treatment processes [4].…”

Section: Introductionmentioning

confidence: 99%

Acetylene Flow Rate as a Crucial Parameter of Vacuum Carburizing Process of Modern Tool Steels

Rokicki

Dychtoń

2016

Archives of Metallurgy and Materials

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Carburizing is one of the most popular and wide used thermo-chemical treatment methods of surface modification of tool steels. It is a process based on carbon diffusive enrichment of the surface material and is applied for elements that are supposed to present higher hardness and wear resistance sustaining core ductility. Typical elements submitted to carburizing process are gears, shafts, pins and bearing elements. In the last years, more and more popular, especially in highly advanced treatment procedures used in the aerospace industry is vacuum carburizing. It is a process based on chemical treatment of the surface in lower pressure, providing much higher uniformity of carburized layer, lower process cost and much lesser negative impact on environment to compare with conventional carburizing methods, as for example gas carburizing in Endo atmosphere. Unfortunately, aerospace industry requires much more detailed description of the phenomena linked to this process method and the literature background shows lack of tests that could confirm fulfilment of all needed requirements and to understand the process itself in much deeper meaning. In the presented paper, authors focused their research on acetylene flow impact on carburized layer characteristic. This is one of the most crucial parameters concerning homogeneity and uniformity of carburized layer properties. That is why, specific process methodology have been planned based on different acetylene flow values, and the surface layer of the steel gears have been investigated in meaning to impact on any possible change in potential properties of the final product.

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Analysis of methods of carburizing of gears from heat-resistant steels

Cited by 10 publications

References 2 publications

Improvement of Mechanical Properties of 20CrMnTi Steel through Microstructure Modification

Improvement of Mechanical Properties of 20CrMnTi Steel through Microstructure Modification

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

Acetylene Flow Rate as a Crucial Parameter of Vacuum Carburizing Process of Modern Tool Steels

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