Explanipedia

Evaluation of fracture toughness of X-60 pipeline steel in-situ high-pressure hydrogen gas Open

Jan KANDER, Gabriela Rožnovská, Petr Jonšta · 2025

HYDROGEN IMPACT ON FRACTURE PROPERTIES OF 34crMo4 pressure cylinder steel Open

Marek DOBIÁŠ, Petr Čížek, Ladislav KANDER, Petr Jonšta · 2023

Currently, technological development is focused, among other things, on hydrogen and its technologies.Hydrogen storage must be very well secured and material resistance against hydrogen embrittlement is tested using different approaches.Ne…

STUDY OF ZINC AND LEAD THERMAL REDUCTION FROM A STEELMAKING SLUDGE Open

Vladislav Kurka, Petr Jonšta, Ladislav KANDER, Roman NOGA, Ondřej KOTÁSEK · 2023

Applications of small punch test Open

Jan KANDER, Ladislav KANDER, Petr Čížek, Petr Jonšta · 2023

Small punch test is an advantageous method for evaluation of mechanical properties of components especially in cases, where it is technically difficult or even impossible to obtain enough bulk material for standard tests.Therefore, the met…

MODELLING OF MATERIAL FLOWS IN PIERCING TECHNOLOGY Open

Marek Vindyš, Tomáš PERNA, Petr Jonšta, Roman NOGA, Rostislav Turoň , et al. · 2022

The article summarises the modelling of the technological process of Mannesmann piercing in the configuration of the GreatMannesmann rolling mill in the Tube Mill of Třinecké Železárny using the approach of both mathematical modelling and …

The Influence of Varying Thermal Treatment Conditions on Reducing Zinc Content from a Steelmaking and Blast Furnace Sludge Open

Vladislav Kurka, Petr Jonšta, Ladislav Kander, Ondřej Kotásek, Jiří Pyš , et al. · 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 l…

The Influence of Varying Thermal Treatment Conditions on Reducing Zinc Content from a Steelmaking and Blast Furnace Sludge Open

Vladislav Kurka, Petr Jonšta, Ladislav Kander, Ondřej Kotásek, Jiří Pyš , et al. · 2022

The prospects of processing blast furnace and steelmaking sludge using Waelz process in a laboratory rotary kiln is shown. The influence of varying thermal treatment modes, furnace atmosphere and type of reducing agents on the level of zin…

The Effect of Bismuth on Technological and Material Characteristics of Low-Alloyed Automotive Steels with a Good Machinability Open

Vladislav Kurka, Zdeněk Kuboň, Ladislav Kander, Petr Jonšta, Ondřej Kotásek · 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 th…

casting and solidification simulation of 65 t steel ingot in thercast software Open

Ondřej KOTÁSEK, Petr Jonšta, Vladislav Kurka, Roman NOGA, Marek Vindyš · 2022

The presented paper deals with a numerical simulation of casting and solidification of a 65-ton ingot made of 25CrMo4 low-alloy chrome-molybdenum steel.The aim was to focus on the assessment of steel melt flow, the risk of formation of mic…

Physical modelling of the seamless micro-alloyed steel tubes production depending on the different temperatures and rpm speeds of the working rolls Open

Roman NOGA, Petr Jonšta, Tomáš PERNA, Marek Vindyš, Ondřej KOTÁSEK , et al. · 2022

The paper presents laboratory physical modeling of the seamless tubes production, specifically the first step of the Mannesmann production process, the so-called punching.A "Universal rolling mill" at MATERIAL & METALLURGICAL RESEARCH Ltd.…

The Effect of Rare Earth Metals Alloying on the Internal Quality of Industrially Produced Heavy Steel Forgings Open

Petr Jonšta, Petr Jonšta, Silvie Brožová, Manuela Ingaldi, Jacek Pietraszek , et al. · 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 stee…

The Effect of Forging Conditions on Final Macrostructure of Slab Ingot from the 55NiCrMoV7 Tool Steel Open

Petr Jonšta, Vladislav Kurka, Marek Vindyš, Ladislav Kander · 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 veri…

inluence of loading cycle asymmetry and long-term thermal exposure on fatigue crack growth rate in martensitic P91 and P92 steels Open

Ladislav Kander, Jan KANDER, Marek DOBIÁŠ, Petr Jonšta · 2021

The paper deals with the effect of different loading cycle asymmetry and long-term thermal exposure on fatigue crack growth rate in P91 and P92 steels used primarily for components in USC powerplants.Testing was performed using C(T) specim…

Comparison of casting and solidification of 12 tON steel ingot using two different numerical software Open

Ondřej Kotásek, Vladislav Kurka, Marek Vindyš, Petr Jonšta, Roman NOGA , et al. · 2021

The submitted article deals with the study of casting and solidification of a 12 t ingot made of structural steel 42CrMo4 using numerical simulations in the THERCAST® and MAGMASOFT® software.The possibilities of each individual software in…

Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing Open

Jana Konrádyová, Margita Longauerová, Petr Jonšta, Petr Jonšta, S. Longauer , et al. · 2019

The aim of the work was to evaluate the hot ductility loss in TiNb stabilized IF steel directly from the continuously-cast slab using hot torsion testing (plastometry) in the temperature range 600–1250 °C according to the basic programme, …

MOLD DESIGN FOR RINGS OF EXTERNAL FIXATOR Open

Martina Kalová, Soňa Rusnáková, Petr Jonšta, Filip Tomanec, Jiří Kohút · 2019

This paper deals with a structural design of a mold for making a composite ring of external circular fixator used in medical applications.It also focuses on the choice of technology and material for the production of a fixator ring.Due to …

the use of numerical simulations to obtain the basic knowledge about casting process OF heavy CIRCULAR INGOT Open

Vladislav Kurka, Marek Vindyš, Petr Jonšta, Jaroslav Pindor · 2019

Reduction of unwanted zinc content in metallurgical wastes and design of rotary kiln Open

Vladislav Kurka, Jaroslav Pindor, Jozef Vlček, Petr Jonšta · 2019

Influence of Physical-Metallurgical Factors on Resistance of API Carbon Steels to Sulphide Stress Cracking Open

Petr Jonšta, Petr Jonšta, Irena Vlčková, J. Sojka · 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…

Bioceramic microspheres based on Si3N4–Ca3(PO4)2 Open

Taťána Fenclová, Petr Jonšta, Miroslav Hnatko, Josef Kraxner, Pavol Šajgalı́k · 2018

This article describes a material prepared for biocements for medical use in human body. Biocements are used, for example, for bone implants or as a filling of bone cavities. The main method of preparation of Si3N4 microspheres in this art…

Resistance of High-Strength Steels to Stress Corrosion Cracking Depending on External Environment pH Factor Open

Petr Jonšta, Irena Vlčková, Petr Jonšta, Vladimír Tomášek, Taťána Fenclová · 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…

Research and Development of the Solidification of Slab Ingots from Special Tool Steels Open

Markéta Tkadlečková, Karel Michalek, Karel Gryc, Ladislav Socha, Petr Jonšta , et al. · 2017

The paper describes the research and development of casting and solidification of slab ingots from special tool steels by means of numerical modelling using the finite element method. The pre-processing, processing and post-processing phas…

Determination of solidus and liquidus temperatures for bearing steel by thermal analysis methods Open

Karel Gryc, Michaela Strouhalová, Bedřich Smetana, Monika Kawuloková, Simona Zlá , et al. · 2017

The first part of presented paper is devoted to comparison of solidus and liquidus temperatures determined by two methods of thermal analysis for one real steel grade 100CrMo7. Two modern devices for high-temperature analysis were used. Th…

Distribution of porosity and macrosegregation in slab steel ingot Open

Markéta Tkadlečková, Petr Jonšta, Z. Carbol, Michal Sušovský, Karel Michalek , et al. · 2017

The paper presents a new knowledge and experiences with verification and optimization of production technology of heavy slab ingot weighing 40 t from tool steel using the results of numerical modelling and of operational experiments at a s…

Increase of chromium yield by slag reduction during production of chromium steels Open

Jiří Bažan, Ladislav Socha, Vladislav Kurka, Petr Jonšta, M Sušovský · 2017

The paper is focused on the evaluation of the course of Cr2O3 reduction from slag to alloyed steel under laboratory conditions. The experiments were aimed at the evaluation of increase in the chromium content in the melt together with the …

Corrosion Fatigue of Austenitic Stainless Steels for Nuclear Power Engineering Open

Irena Vlčková, Petr Jonšta, Petr Jonšta, Petra Váňová, Taťána Kulová · 2016

Significant structural steels for nuclear power engineering are chromium-nickel austenitic stainless steels. The presented paper evaluates the kinetics of the fatigue crack growth of AISI 304L and AISI 316L stainless steels in air and in c…

Gass presure sintered Si3N4 – MgSiN2 composites Open

Vladana Pečínková, Zoltán Lenčéš, Petr Jonšta · 2016

Si₃N₄ and MgSiN₂-based ceramic composites have excellent thermo-physical and mechanical properties, however with limited industrial applications. In this paper the preparation of Si₃N₄…

Influence of selected rare earth metals on structural characteristics of 42CrMo4 steel Open

Jaromír Drápala, Silvie Brožová, Ivo Szurman, Kateřina Konečná, Gabriela Kostiuková , et al. · 2016

The influence of rare earth metals (REM) addition on solidification structure of the low-carbon 42CrMo4 steel was \ninvestigated. Alloys were prepared by means of a centrifugal casting. The addition of cerium, praseodymium or \nmischmetal …

Material Analysis of Degraded Steam Turbine Rotor Open

Petr Jonšta, Irena lckova, Petr Jonšta, Roman Heide · 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 defect…

Hydrogen Embrittlement of Welded Joint Made of Supermartensitic Stainless Steel in Environment Containing Sulfane Open

Petr Jonšta, Petra Váňová, Silvie Brožová, Pavlína Pustějovská, J. Sojka , et al. · 2016

The work is focused on evaluation of resistance of the welded joint made of supermartensitic 13Cr6Ni2.5Mo stainless steel to sulfide stress cracking. Testing method A and solution B in accordance with NACE TM 0177 were used. All the testin…

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