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Matocha K.,Material and Metallurgical Research Ltd.
Journal of Pressure Vessel Technology, Transactions of the ASME | Year: 2011

This paper describes the structure of the Standard Technical Documentation of the Association of Mechanical Engineers of Czech Republic, Sec. II, "Material Properties for Equipments and Pipings of Water moderated, Water Cooled Energy Reactor (WWER) Nuclear Power Plants (NPPs)." It provides instructions for selection and qualification of parent materials used for manufacture, repair, reconstruction, or replacement of selected equipments of WWER NPP, and specifies requirements for mechanical characteristics and physical properties. © 2011 American Society of Mechanical Engineers.


Kubon Z.,Material and Metallurgical Research Ltd.
Key Engineering Materials | Year: 2015

Current trend in increasing steam parameters in ultra-supercritical (USC) boilers requires new materials not only for membrane walls, headers and pipelines but also for superheater and reheater tubes. Newly developed austenitic steels Super304H. TP347HFG and HR3C exhibit superior resistance in steam thanks to their fine-grained microstructure, especially in case of Super304H and TP347HFG. The paper presents the results of verification of properties of these steels tubes including creep resistance of the base metal and welded joints, which show promising level of long-term creep strength of the base metal and weld joints and these results are supplemented by some new knowledge about the development of the microstructure of these steels, especially sigma phase appearance. © (2015) Trans Tech Publications, Switzerland.


Jonsta P.,Vitkovice Heavy Machinery a.s. | Vlckova I.,Material and Metallurgical Research Ltd. | Jonsta Z.,VSB - Technical University of Ostrava
Manufacturing Technology | Year: 2016

In the aerospace industry, the nickel-based superalloys are often used due to their ability to withstand extreme conditions. They find their use particularly as turbine blades in jet engines. An important example of this type of superalloy is INCONEL. This construction material must meet a wide range of complex requirements with regard to its properties and technological and operational characteristics that are required by the heavy duty in extreme conditions. The INCONEL Superalloys represent multicomponent and multiphase materials with their complex alloying base and structure with distinct dendritic segregations. Their long life and reliability in operation are directly related to the microstructure, or to its stability in a long-term operational application, respectively. The presented work deals with the evaluation of microstructural parameters at two variants of cast superalloy INCONEL 713LC, applying the light microscopy and electron microscopy, including the fractographic analysis. © 2016. Published by Manufacturing Technology.


Hurst R.C.,University of Swansea | Matocha K.,Material and Metallurgical Research Ltd.
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP | Year: 2015

The underlying purpose of this paper is to evaluate whether the CEN CWA 15627 "Small Punch Test Method for Metallic Materials" first published in 2006 has indeed succeeded in providing a stimulus for a wider implementation of the small punch test technique in industrial applications throughout Europe and indeed worldwide. A wealth of research progress has been apparent, as strongly evidenced in three dedicated SSTT (Small Specimen Testing Techniques) conferences held in Europe over the last five years, but also in the wider literature. In particular it is important to mention the recent publication of a Japanese standard and the announcement of parallel progress in China. The present paper concentrates on progress within Europe from the launch of the Code to the present day. In particular attention is focused on the need for industrial acceptance of the test methodology and methods for evaluating the results. Some scepticism still seems to prevail within sectors of the conventional power generation industry, an industry which can potentially benefit most from successful remanent lifetime extension tools of which small punch testing can be considered as a prime candidate. In spite of this, it is demonstrated that a major proportion of the Small Punch testing research of the last decade has been carried out on power plant steels. Meanwhile it is shown that there is evidence that the original remit of the methodology in assessing the integrity of irradiated nuclear plant remains active, new interest is developing for aerospace and next generation nuclear applications enhancing further the credibility of the Code. Copyright © 2015 by ASME.


Matocha K.,Material and Metallurgical Research Ltd.
Procedia Engineering | Year: 2014

The paper summarizes the experience gained with the evaluation of the transition behaviour of steels with BCC lattice from the results of penetration tests. Determination of fracture appearance transition temperature FATT from the results of penetration tests is currently performed only on empirical correlations between FATT and transition temperature TSP determined of the penetration tests in the temperature range from -193 ° C to +23°C. Factors that may significantly affect the transition temperature TSP and thus empirical correlations FATT-TSP are discussed. © 2014 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

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