Temat: gas carburizing - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Anti-wear properties of medium carbon steel after carburizing with subsequent diffusion chromizing and PVD treatment
Przeciwzużyciowe właściwości stali średniowęglowej po nawęglaniu z następnym dyfuzyjnym chromowaniem i obróbką PVD
Autorzy:: Kasprzycka, Ewa
Bogdański, Bogdan
Powiązania:: https://bibliotekanauki.pl/articles/188554.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: diffusion chromizing
gas carburizing
PVD treatment
layer
wear
chromowanie dyfuzyjne
nawęglanie gazowe
obróbka PVD
warstwa
zużycie
Opis:: The paper discusses the results of research on the structure and tribological properties of hybrid layers produced on the surface of medium-carbon steel in hybrid treatment, combining gas carburizing process with the next treatment, i.e. diffusion chromizing and PVD treatment. A comparison was made of the structure and tribological properties of the layers obtained as a result of hybrid treatment with the layers produced in a single diffusion chromizing process. The studies of the layers concerned their structure, chemical composition, thickness, and hardness. Linear wear of the layers were performed by means of three-cylinder-cone method. It has been shown that the linear wear of samples with hybrid layers, produced on medium carbon steel, is less than 50% of samples with single carbide layers. This indicates very good anti-wear properties of hybrid layers.
W pracy omówiono wyniki badań dotyczących budowy oraz właściwości tribologicznych warstw hybrydowych, wytwarzanych na powierzchni stali średniowęglowej, w obróbce hybrydowej łączącej nawęglanie gazowe z następną obróbką – chromowaniem dyfuzyjnym oraz obróbką PVD. Przeprowadzono porównanie budowy i właściwości tribologicznych warstw otrzymanych w wyniku obróbki hybrydowej z warstwami, wytworzonymi w pojedynczym procesie chromowania dyfuzyjnego. Badania warstw dotyczyły ich budowy, składu chemicznego, grubości i twardości. Zużycie liniowe warstw oceniano metodą trzy wałeczki-stożek. Wykazano, że zużycie liniowe próbek z warstwami hybrydowymi, wytworzonymi na stali średniowęglowej, jest ponad dwukrotnie mniejsze niż próbek z pojedynczymi warstwami węglikowymi. To świadczy o bardzo dobrych właściwościach przeciwzużyciowych warstw hybrydowych.
Źródło:: Tribologia; 2019, 288, 6; 25-30
0208-7774
Pojawia się w:: Tribologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Distortion of 16MnCr5 steel parts during low-pressure carburizing
Autorzy:: Dybowski, K.
Niewiedzielski, R.
Powiązania:: https://bibliotekanauki.pl/articles/102321.pdf
Data publikacji:: 2017
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: thermo-chemical treatment
low pressure carburizing
distortion
gas quenching
Opis:: One of the many advantages of low pressure carburizing (LPC) is that it can be combined with high-pressure gas quenching. This makes it possible to achieve workpieces with pure metallic surfaces, less distortion hardening, and, above all, it allows a more reliable and repeatable treatment than conventional oil quenching. This article presents a study of the distortion rate of workpieces carburized at low pressure then quenched in nitrogen at 1.4 MPa. By comparing the distortion which takes place during the carburizing stage only and the carburizing combined with post-carburizing heat treatment it will be possible to assess the distortion rate and its causes at the different stages of the heat treatment process.
Źródło:: Advances in Science and Technology. Research Journal; 2017, 11, 1; 201-207
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The influence of hardening medium in the vacuum carburizing process on the distortion of machine elements used in the automotive industry
Autorzy:: Pawęta, S.
Pietrasik, R.
Powiązania:: https://bibliotekanauki.pl/articles/367941.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: distortion
gas quenching
oil quenching
thermo-chemical treatment
vacuum carburizing
odkształcenie
chłodzenie w gazie
hartowanie w gazie
chłodzenie w oleju
hartowanie w oleju
obróbka termochemiczna
nawęglanie próżniowe
Opis:: Purpose: As part of this study, the influence of the hardening medium on distortions of FineCarb® carburized rollers used in the automotive industry as elements of fuel pumps has been examined. The analysis was carried out for the process of quenching in gas at different pressure of cooling gas and quenching in oil at variable delay time of oil mixers. Design/methodology/approach: The research was carried out on real elements used in the automotive industry as elements of fuel pumps. FineCarb® vacuum carburizing technology was used in order to obtain optimal parameters of the surface layers. During quenching a variable related to the parameters of the quenching medium was introduced. For quenching in gas it was the pressure at which nitrogen was introduced into the cooling chamber, while for quenching in oil it was the time of mixers delay. The sample batch was laid out in accordance with the PPAP (Production Part Approval Process) requirements for the automotive industry. Microhardness and radial runout measurements were carried out on the samples and subjected to statistical analysis. Findings: The analysis of each hardening processes has showed that depending on the cooling medium used, different distortion values are obtained. The distortion value is significantly influenced by the parameters of the hardening process - gas pressure/oil mixers delay. With the proposed quenching parameters, there is no relationship between the location of the sample in the furnace chamber and the distortion value. The smallest hardening distortions were obtained as a result of the hardening process in gas at a gas pressure of 3 bar. Hardening in gas was characterized by the smallest scatter values of obtained results of radial runout. Research limitations/implications: Basing on the studies and analyses carried out in this work, it can be concluded that the introduction of gas quenching technology instead of oil quenching technology is justified qualitatively and economically alike. Hardening in gas was also characterized by the smallest scatter values of obtained results of radial runout. This is an extremely important technological and economic aspect, due to the cost of grinding processing. Practical implications: The automotive and aviation industries are putting ever greater demands on the quality of manufactured components while reducing costs. It requires optimization of technological processes from co-operators. In the case of hardening plants, the most important aspect is obtaining repeatable, precisely planned parameters of the carburized layer, as well as minimizing the negative phenomena that cause dimensional changes after hardening of elements. The tests allowed to determine the most effective hardening conditions in terms of obtained distortions and costs of eliminating distortions. However, the selection of the optimal parameters depends on whether the core hardness requirements are also determined. Originality/value: The conducted tests allowed to determine the most effective hardening conditions in terms of obtained distortions, costs of levelling distortions and a complete technological process for the automotive industry.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2019, 94, 1-2; 32-40
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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