Optimization Method for Gear Heat Treatment Process Oriented to Deformation and Surface Collaborative Control

Liang, Ruijun; Tian, Guifen; Gao, Lixiang; Li, Huawen

doi:10.1007/s11665-023-08734-3

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…Low-alloy steels, with their cost-effectiveness and desirable mechanical properties, have become a mainstay in critical components like gears, shafts, bearings, and tools [1,2]. However, their inherent limitations, such as low hardness, limited wear resistance, and susceptibility to fatigue, restrict their suitability for demanding applications where durability and reliability are paramount [3,4]. While some low-alloy steels are suitable for specific applications, such as automotive clutch parts or chain components, they often lack the strength and resilience needed for high-performance applications that require resistance to wear, impact, and high stresses.…”

Section: Introductionmentioning

confidence: 99%

Effect of carburizing time treatment on microstructure and mechanical properties of low alloy gear steels

Boumediri,

Touati,

Debbah

et al. 2024

Mater. Res. Express

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Gas carburizing significantly enhances the surface properties of low-alloy gear steels, resulting in superior micro-hardness, layer thickness, carbon content, and overall mechanical properties. Unlike other thermochemical processes such as nitriding and carbonitriding, which have limitations in core properties and hardening depth, gas carburizing offers unmatched surface hardness, wear resistance, and mechanical strength. This makes it ideal for demanding applications in the automotive, aerospace, and manufacturing industries. In this research, samples were gas-carburized for 4, 6, or 8 h. The results showed significant improvements: micro-hardness increased from approximately 140 HV to over 819 HV, and the surface layer thickness grew by more than 41%, from 1166 μm to 1576 μm. Additionally, the carbon content in the surface layer increased by over 450%, reaching up to 0.94 wt%. Clear correlations were observed between the duration of heating and the mechanical properties. Longer heating times, particularly after 8 h, raised ultimate tensile strength from 427.29 MPa to 778.33 MPa, while simultaneously decreasing elongation from 26.07% to 2.88% and resilience from 180 J cm−2 to 6.66 J cm−2. This optimization not only enhances surface hardness and durability but also improves key mechanical properties such as tensile strength, stiffness, resilience, and overall mechanical performance.

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Section: Introductionmentioning

confidence: 99%

Effect of carburizing time treatment on microstructure and mechanical properties of low alloy gear steels

Boumediri,

Touati,

Debbah

et al. 2024

Mater. Res. Express

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“…Carburizing is mostly used on critical parts for which high dimensional accuracy is required. Deformations are a side effect of thermo-chemical treatment at elevated temperatures [14][15][16][17][18][19]. The extent of deformations resulting from carburizing and subsequent heat treatment is a function of thermal/plastic and structural deformations.…”

Section: Introductionmentioning

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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Optimization Method for Gear Heat Treatment Process Oriented to Deformation and Surface Collaborative Control

Cited by 2 publications

References 21 publications

Effect of carburizing time treatment on microstructure and mechanical properties of low alloy gear steels

Effect of carburizing time treatment on microstructure and mechanical properties of low alloy gear steels

Minimizing Deformations in High-Temperature Vacuum Carburizing

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