Temat: micro-alloyed steel - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effects of V-Ti on Dynamic Recrystallization Behavior and Hot Deformation Activation Energy of 30MSV6 Micro-alloyed Steel
Autorzy:: Tavaei, K.
Meysami, A.
Powiązania:: https://bibliotekanauki.pl/articles/353695.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: dynamic recrystallization
activation energy
hot compression
30MSV6 micro-alloyed steel
flow stress
Opis:: In the current study, the hot deformation of medium carbon V-Ti micro-alloyed steel was surveyed in the temperature range of 950 to 1150°C and strain rate range of 0.001 to 1 s^-1 after preheating up to 1200°C with a compression test. In all cases of hot deformation, dynamic recrystallization took place. The influence of strain rate and deformation temperature on flow stress was analyzed. An increase in the strain rate and decrease in the deformation temperature postponed the dynamic recrystallization and increased the flow stress. The material constants of micro-alloyed steel were calculated based on the constitutive equations and Zener-Hollomon parameters. The activation energy of hot deformation was determined to be 458.75 kJ/mol, which is higher than austenite lattice self-diffusion activation energy. To study the influence of precipitation on dynamic recrystallization, the stress relaxation test was carried out in a temperature range of 950 to 1150°C after preheating up to 1200°C. The results showed no a stress drop while representing the interaction of particles with dynamic recrystallization.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 3; 1195-1200
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Microstructure Examinations in Corners of the Low-Carbon Steel Slabs from Continuos Caster Machine
Autorzy:: Kwinta, G.
Kara, S.
Kalandyk, B.
Zapała, R.
Pałka, P.
Powiązania:: https://bibliotekanauki.pl/articles/351069.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: API 5L line pipe steels
low-carbon micro alloyed steel
microstructure
non-metallic inclusion
Opis:: The exposed selvedge layers in slabs cast by the continuous process should be free from surface defects, which in most cases appear in the form of cracks on the casting surface and run to its interior. In addition to the parameters of the casting process, the occurrence of such defects depends on the chemical composition of cast steel, on the segregation of surface active elements and formation of the precipitates of carbides, nitrides and other phases. Due to the frequent occurrence of defects in corners of the slabs, non-destructive testing was performed on the mechanically cleaned surfaces of slabs. The test material was low-carbon API(American Petroleum Institute API 5L standard) steel micro alloyed with Nb and Ti designed for the production of pipes to handle gas, oil and other liquid and gaseous fuels. Despite the use of different methods of inspection, i.e. ultrasonic, magnetic particle and penetrant, cracks were not traced in the examined material. Then, from the corners of the examined slabs, specimens were cut out for metallographic examinations. The main purpose of these examinations was to disclose the presence of possible cracks and micro cracks on the surfaces transversal and longitudinal to the direction of casting. At the same time, studies were conducted to establish the number and morphology of non-metallic inclusions in selvedge layers of the slab corners and axis. Additionally, hardness of the slabs was measured. The conducted studies revealed only some minor differences in the slab hardness along its axis (130 ÷ 135 HB) and in selvedge layers (120 ÷ 123 HB).
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 4; 2051-2056
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Research on the degradation process of agricultural tools in soil
Badanie procesu niszczenia narzędzi rolniczych w glebie
Autorzy:: Stabryła, J.
Powiązania:: https://bibliotekanauki.pl/articles/257783.pdf
Data publikacji:: 2007
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:: stal mikrostopowa
zużycie ścierne
atak wodoru
narzędzie rolnicze
micro-alloyed steel
abrasive wear
hydrogen attack
agricultural tools
Opis:: The wear of agricultural tools in previous publications was defined mostly as a simple process of abrasion. Any additional factors other than mechanical ones were not taken into account. Only a few explorers have taken into account the acidity of soil. The considerable content of salt, acids, and hydrocarbons at a significant degree, accelerates the processes of the wear on tools working in moist soil. The laboratory investigations were aimed at the assessment of electrochemical processes and hydrogen on the abrasive wear of agricultural tools. Carbon and micro-alloyed steel were studied.
W dotychczasowych publikacjach zużycie uprawowych narzędzi rolniczych określano najczęściej jako prosty proces ścierania, nie uwzględniano dodatkowych czynników - innych niż mechaniczne. Tylko nieliczni badacze brali pod uwagę kwasowość gleby. Znaczna zawartość soli, kwasów i węglowodorów w dużym stopniu przyśpiesza procesy zużycia narzędzi pracujących w wilgotnej glebie. Przeprowadzono badania laboratoryjne, które miały na celu ocenę wpływu procesów elektrochemicznych i wodoru na zużycie ścierne narzędzi rolniczych. Badano stal węglową i mikrosto-pową.
Źródło:: Problemy Eksploatacji; 2007, 4; 223-232
1232-9312
Pojawia się w:: Problemy Eksploatacji
Dostawca treści:: Biblioteka Nauki

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