Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Petr Jonsta"'
Autor:
Vladislav Kurka, Petr Jonšta, Ladislav Kander, Ondřej Kotásek, Jiří Pyš, Ivana Klásková, Roman Noga, Marek Vindyš, Gražyna Simha Martynková
Publikováno v:
Metals, Vol 12, Iss 11, p 1961 (2022)
The prospects of processing blast furnace and steelmaking sludge using the Waelz process in a laboratory rotary kiln, is shown. The influence of different processing temperatures, furnace atmosphere and the type of reducing agents on the level of zin
Externí odkaz:
https://doaj.org/article/bbd8976866ed4e6ba185c9dcd977c141
Autor:
Petr Jonšta, Zdeněk Jonšta, Silvie Brožová, Manuela Ingaldi, Jacek Pietraszek, Dorota Klimecka-Tatar
Publikováno v:
Materials, Vol 14, Iss 18, p 5160 (2021)
The paper presented the findings obtained by industrial research and experimental development on the use of rare earth metals (REMs) in the production of heavy steel ingots and their impact on the internal quality of the 42CrMo4 grade steel forging.
Externí odkaz:
https://doaj.org/article/04717686bfb34cb7aecf5287c7cc3176
Publikováno v:
Metals, Vol 11, Iss 3, p 435 (2021)
The paper presents numerical modelling and an operational experiment to forge a slab ingot P40N from 55NiCrMoV7 tool steel and the procedure for the optimization of its production. The aim of the numerical simulation of forging was to verify the exis
Externí odkaz:
https://doaj.org/article/ffa2b06e40734eccb62a92670f9049db
Publikováno v:
Communications, Vol 20, Iss 4, Pp 41-46 (2018)
The paper deals with the influence of physical-metallurgical factors on resistance of the X52 and X70 steels in accordance with API 5L to sulphide stress cracking. The resistance against this kind of damage is relatively clearly claimed by usually us
Externí odkaz:
https://doaj.org/article/c985e9e2bae14b84bc7b293ac9ab6ebd
Publikováno v:
Communications, Vol 20, Iss 3, Pp 19-23 (2018)
The paper deals with the study of stress corrosion cracking of high-strength steels in an aqueous environment with a varying pH factor ranging from 5.5 to 12.0. Steels were studied after quenching and tempering, one of the steels was prone to temper
Externí odkaz:
https://doaj.org/article/b37866f328644f29bb1ee0d6be47e856
Publikováno v:
Communications, Vol 18, Iss 3, Pp 78-82 (2016)
This article deals with structural, fractographic and non-destructive analysis of a defective rotor made of 26NiCrMoV14-5 steel and assessment of possible technological failures resulting in the occurrence of cracking and subsequent defects. Metallog
Externí odkaz:
https://doaj.org/article/244d6191099e49e1be97b0333eba04b2
Publikováno v:
Communications, Vol 14, Iss 4, Pp 43-47 (2012)
This paper presents the results of a microstructural phase analysis of the nickel superalloy MAR M247 after casting and different modes of dissolving annealing in the range of 900°C - 1240°C with cooling in water. The alloy in question presents a p
Externí odkaz:
https://doaj.org/article/35fa075a1e194bbe8cc5d724be465cb1
Publikováno v:
Communications, Vol 12, Iss 4, Pp 90-94 (2010)
Alloys of INCONEL (hereinafter IN) type play an important role among superalloys, used for the components of aircraft engines, gas turbinesand turbo blowers. It is cast material which is alloyed in a complex manner on the Cr-Al-Mo-Ti-Nb-Zr basis.The
Externí odkaz:
https://doaj.org/article/820c9f8cb0b245a7bd4184eb760c64a8
Publikováno v:
Communications, Vol 11, Iss 1, Pp 34-38 (2009)
Aerospace industry often uses nickel superalloys for blades of jet engine turbines. The reason is that this material can satisfy numerous extreme requirements, such e.g. strength even at very high temperatures, resistance to fatigue damage, resistanc
Externí odkaz:
https://doaj.org/article/0aa879e6ba7640ddb66724257fe47a0b
Publikováno v:
Metals, Vol 12, Iss 2, p 301 (2022)
The aim of this work is to compare the technological and material properties of CMnCr steels without bismuth, with 0.08 wt. % Bi and 0.12 wt. % Bi. Experimental heats showed that the most advantageous alloying of Bi into the heat was in the ladle, wi
Externí odkaz:
https://doaj.org/article/bd5d45c33db24288bd03a045df247507