Effect of post carburizing treatments on residual stress distribution in plain carbon and alloy steels – a numerical analysis

Hiremath, P. S.; Sharma, Sathyashankara; Gowrishankar, M. C.; Shettar, Manjunath; Gurumurthy, B M

doi:10.1016/j.jmrt.2020.05.104

Cited by 17 publications

(9 citation statements)

References 43 publications

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“…The inner surface of the bore (named: in) and the top of the specimen (named: top) were measured to observe the effect of the carburizing in a closed and open system. Chen and Liu [21] used a continuous gas in their specimen in a vacuum furnace. A uniform layer was created in the deep hole (ø3 × 110 mm) with this method.…”

Section: Microstructurementioning

confidence: 99%

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Verification of the Simulated Carburizing Process in Different Bore Sizes

Rumony,

Szlancsik,

Kovács

2023

Coatings

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Carburizing is one of the leading surface treatments in the industry. For this study, 20MnCr5 steel was gas carburized and quenched in real circumstances and simulated with Simufact software. The research investigated the dimensions and types of bores. A through and blind bore was used in this study to analyze how the geometry affects the created layer and, additionally, it takes into account the placement in the heat treatment furnace. An optical microscope and Vickers hardness tester were used to detect the changes in microstructure and measure the layer thickness. After the experiments, a simulation calculated the same variables to compare and validate the results to each other. It can be stated that the placement in the chamber did not influence the form of the high carbon content layer. The simulation and the measured results were in good agreement. The maximum hardness difference was 17%, but the calculated layer thicknesses were always between the measured data. For example, in the case of a small blind bore, the calculated layer thickness was 1.68 ± 0.18 mm, while the measured value was 1.54 ± 0.37 mm. Additionally, the hardness change in depth was similar in both cases. After this validation process, the residual stresses and plastic strains were determined. The maximum residual stresses were similar for every case, namely around 1900 MPa, while the maximum plastic strain was measured in a small blind bore with a value of 0.18. The minimum plastic strain was 0.04 in the through bore.

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Section: Microstructurementioning

confidence: 99%

“…In most cases, researchers focused on residual stress, which is significant for distortion behavior during heat treatment [18,19]. The variation of the carbon content and the retained austenite influenced the residual stress distribution, but despite the different values (25-900 MPa), all of it was compressive [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Verification of the Simulated Carburizing Process in Different Bore Sizes

Rumony,

Szlancsik,

Kovács

2023

Coatings

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“…Moreover, coking in the pyrolysis process has an influential effect on the dehydrogenation catalytic reaction of hydrocarbons by Fe or Ni due to the increase in heat transfer resistance and pressure loss on the inner surface of the cracking tube. It also tends to change the microstructure of the tube by carburization, resulting in volume expansion and heat [4]. In turn, this lowers the coefficient of expansion and causes material embrittlement leading to cracking tube breakage.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pre- and Post-Carburizing Surface Modification on the Tribological and Adhesion Properties of Heat-Resistant KHR 45A Steel for Cracking Tubes

Amanov

Choi²,

Pyun

2021

Materials

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In this study, the effects of ultrasonic nanocrystal surface modification (UNSM) technology on the tribological properties and scratch-induced adhesion behavior of a heat-resistant KHR 45A steel cracking tube, which is used for the pyrolysis process, were investigated. The main objective of this study is to investigate the effects of pre- and post-carburizing UNSM treatment on the tribological and adhesion performances of carburized domestic KHR 45A (A) steel and to compare the results with the existing carburized Kubota-made KHR 45A steel (B). A carburizing process was carried out on the polished and UNSM-treated KHR 45A steel substrates, which were cut out from the cracking tube, at 300 °C heat exposure for 300 h. The thickness of the carburizing layer was about 10 μm. UNSM technology was applied as pre- and post-carburizing surface treatment; both reduced the friction coefficient and wear rate compared to that of the carburized KHR 45A steel substrate. It was also found that the application of UNSM technology increased the critical load, which implies the improvement of adhesion behavior between the carburizing layer and the KHR steel substrate. The application of UNSM technology as pre- and post-carburizing surface treatment could help replace carburized Kubota-made KHR 45A steel (B) thanks to the improved tribological performance, enhanced scratch resistance, load bearing capacity, and adhesion of domestic KHR 45A (A) steel.

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“…A component distortion and thus dimensional inaccuracy could be caused by quenching. Occurrence of cracks after quenching is not rare too (5). Therefore, in case of components of heavy duty vehicles, power plants or mill plants and especially military vehicles and weapons systems, where high requirements on components quality are placed, different surface treatments are being looked for.…”

Section: Introductionmentioning

confidence: 99%

Modification of Surface Structure by Diffusion Processes

Procházka¹,

Dobrocký²,

Joska³

et al. 2021

ECS Trans.

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In the paper an effect of a diffusion technology such as gaseous ferritic nitrocarburizing on the surface properties of selected alloyed case-hardening steel was tested. The steel 18CrNiMo7-6, primarily predetermined for carburizing and frequently utilized in manufacturing of highly strained components, where high core tensile strength as well as hard surface is demanded, was exposed to gaseous ferritic nitrocarburizing. Such treated surface was subjected to experimental methods. The microstructure observation and the determination of the white layer thickness was performed on the Opto-digital microscope Olympus DSX500i. The nitriding hardness depth of the surface layer from the microhardness profiles obtained by the microhardness tester LM247 AT LECO was deduced. The wear resistance was assessed by utilizing the Scratch test method performed on the tribometer Bruker UMT-3 TriboLab. Results of the measurements present an effect of gaseous ferritic nitrocarburizing on the surface properties of the steel 18CrNiMo7-6 and provide a perception of possibility to substitute the frequently utilized carburizing by the gaseous ferritic nitrocarburizing.

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Effect of post carburizing treatments on residual stress distribution in plain carbon and alloy steels – a numerical analysis

Cited by 17 publications

References 43 publications

Verification of the Simulated Carburizing Process in Different Bore Sizes

Verification of the Simulated Carburizing Process in Different Bore Sizes

Effects of Pre- and Post-Carburizing Surface Modification on the Tribological and Adhesion Properties of Heat-Resistant KHR 45A Steel for Cracking Tubes

Modification of Surface Structure by Diffusion Processes

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