Distortion Mechanisms During Carburizing and Quenching in a Transmission Shaft

Tewary, Ujjal; Mohapatra, Goutam; Sahay, Satyam S.

doi:10.1007/s11665-017-2951-9

Cited by 11 publications

(4 citation statements)

References 21 publications

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“…In addition, RA is unstable and is easy to transform into martensite as a result of thermal and mechanical stresses encountered during service [10]. The transformation process is associated with volume expansion, therefore it leads to dimensional variation and distortion of the components and even to failure [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cryogenic Treatment on Microstructure and Wear Resistance of Carburized 20CrNi2MoV Steel

Wang

et al. 2018

Metals

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This paper investigated the response of carburized 20CrNi2MoV steel to cryogenic treatment including microstructure and wear resistance. Two cryogenic treatment methods including cryogenic treatment at −80 °C (CT) and deep cryogenic treatment at −196 °C (DCT) as well as conventional heat treatment (CHT) were carried out after carburizing process. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD) were employed for microstructure characterization. The wear resistance was investigated by ball-on-disc sliding wear test on a multi-functional tribometer. The results show that the wear resistance of the experimental steel has been improved by 17% due to CT and by 25.5% due to DCT when compared to CHT. This significant improvement in wear resistance after cryogenic treatment is attributed to the microstructural changes including the finer martensitic structure, the reduction of retained austenite and the development of fine and more numerous carbides. Among these factors, the precipitation of fine carbides plays a more prominent role in enhancing wear resistance.

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Section: Introductionmentioning

confidence: 99%

Effect of Cryogenic Treatment on Microstructure and Wear Resistance of Carburized 20CrNi2MoV Steel

Wang

et al. 2018

Metals

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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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“…In case of barrels of small arms and large-caliber artillery barrels or engine and transmission components such as shafts, crankshafts, gear wheals etc. it is crucial to obtain hard and wear resistive microstructure near the surface while the microstructure of the core must remain tough enough to resist bending, torque or impacts [1][2][3][4][5]. For the reason a heat treatment such as surface hardening and a chemical-heat treatment such as carburizing, which meet mentioned criteria, are used the most commonly.…”

Section: Introductionmentioning

confidence: 99%

“…By the rapid cooling within quenching, a diffusion of particles is limited, which results in a residual stress in the microstructure and it can be also remained after subsequent tempering. This phenomenon can be manifested by a distortion leading to a geometrical and dimensional changes of components, brittleness and ruptures in their microstructure [1]. In sphere of military technology a high quality of components, including very precise manufacturing, is demanded [8].…”

Section: Introductionmentioning

confidence: 99%